HP Hewlett Packard Computer Drive Q153090901 User Manual

HP Ultrium tape drives

Technical reference manual

Generation 3 drives

Volume 3—the SCSI interface

Part Number: Q 1530–90901 Volume 3

Edition 6, December 2004

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Contents

Rel a t e d documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

D o cuments specific to HP Ultrium drive s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

D o cument a t i o n m a p . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

General documents and st a n dardiza t ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 0

1 Inter f a c e I m p l e m e nt a t i o n

The SCSI interf a c e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Supported mess a ges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Supported comm a n ds. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

SCSI f e a t ures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3

D e sign a pp r o a c h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

P o wer -o n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

R e set str a t e gy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

A b ort h a n d l ing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4

LUN identification (parallel SCSI only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Bus pa r ity or C R C e rror s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Disconnect str a t e gy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Multi -i niti a t or support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Fibre Ch a n nel opera t ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 8

Fi b re Ch a n nel addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Field replaceable units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

CD-R O M e m ul a t io n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

2 Mess a ges

Mess a ge O u t support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Message In support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Extended Message support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

3 Comm a n ds—introduction

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Command details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Pre-execution checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Bad LUN check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Deferred Error check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Diagnostic Status check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Fixed Bit check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Flag Link check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Contents

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Ill e gal Command check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Illegal Field/ Request check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Med i a Access check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Media I n form a t i o n check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Media W rite check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

P a r a m eter L i st check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

R e serv a t ion check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Unit Att e n t i o n check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Comm a n d descriptor block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

4 Comm a n ds

ERASE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 9h 38

INQ U IR Y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12h 39

I N Q U IRY d a t a p ages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Vit a l P roduct D a t a p ages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Supported V it a l P roduct D a t a P a ges page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Unit Seri a l N u mber page 45

D e v ice I d en t ific a t ion p a ge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

D e f ined identifiers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 6

Ext e nded I N Q U IRY D a t a VPD p age . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Sequenti a l A ccess Device C a pab i liti e s page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Drive Component R e v ision L e v e l s p ages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

LOAD/ U N L O A D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 B h 5 0

LOCA T E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 B h 5 3

LOG SE L E C T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Ch 55

LOG SE N S E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 D h 5 7

L o g page f o rm a t . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Supported L o g P a ges page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

W rite Error Counters log p a ge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

R e ad E rror Counters log p a ge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Sequenti a l A ccess Device log p a ge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

T e mper a t ure log p a ge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

D T D S t a t us log p a ge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

V e ry High F r e quency D a t a (VHF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3

V e ry High F r e quency P o l ling D e l a y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

D T D P r im a r y Port St a t us . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4

T a pe A l e rt l o g page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

T a pe U s a ge l o g page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

T a pe Capac i ty l o g page. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Data Compression log page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Performance Data log page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Device Status log page. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

MODE SELECT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15h/ 55h 71

Mode parameter pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Mode page representation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Mode data format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Mode block descriptor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

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R e ad -W r ite Error R e co v e ry mode page. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Disconnect -R e connect page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

SCSI drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 8

Control mode p a ge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

D a t a Compression Ch a r a c teristics p a ge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

D e v ice Configur a t ion p a ge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Medium P a r titions mode p a ge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Fi b re Ch a n nel L o gic a l U nit Control mode p a ge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

SCSI L U N Control mode p a ge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Fi b re Ch a n nel P o rt Control mode p a ge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

SCSI Port Control Mode p a ge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Norm a l page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Sub -p ages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

I n f o rm a t ion Exceptions mode p a ge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Device T i me mode page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

CD-R O M E mulation/ Disaster Recovery mode page . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

MO D E SE N S E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 A h/ 5 A h 9 6

PER S I S T E N T R E S ERVE IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 E h 9 8

PER S I S T E N T R E S ERVE O U T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 F h 1 01

A d d i tion a l pa r a m eter d a t a . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 03

PREVE N T / A L L O W M EDIUM REM O V A L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 E h 1 05

READ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 8h 106

READ 6 (CD -R O M m ode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 8h 109

READ 1 0 (C D -R O M m ode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 8h 110

READ A T TRIBUTE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Ch 111

MAM a t tri b ute d a t a . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 15

Attri b ute I D v a l u e s 116

St a n dard de v ice ty p e a t tri b utes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

St a n dard medium type attributes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

St a n dard host type a t tri b utes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

READ B L O CK L I M I TS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .05h 120

READ BUFFER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Ch 121

READ C APAC I TY (CD -R O M m ode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 5h 124

R e ad Capac i ty d a t a . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 24

READ MEDIA SERIAL N U MBER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A Bh 1 25

READ P O S I TI O N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34h 127

READ T O C (C D -R O M m ode). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3h 131

R e ad T O C da t a 1 32

RECEIVE DIA G NO S T I C S R E S U L T S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Ch 133

RELEASE UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17h/ 57h 135

REPORT DENSITY SUPPORT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44h 137

REPORT DEVICE IDENTIFIER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A3h 140

REPORT LUNS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A0h 141

REPORT SUPPORTED OPCODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A0h 143

REPORT SUPPORTED TASK MANAGEMENT FUNCTIONS . . . . . . . . . . . . . . . . . . . . . A3h 145

REQUEST SENSE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .03h 147

Request Sense data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148

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Fix e d f o rm a t . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 48

D e scriptor form a t 152

Sense d a t a m a n a ge m ent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154

Current sense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154

U N I T ATTE N T I O N s ense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

DEFERRED ERR O R s ense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156

Sense keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

A d d i tion a l S ense codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159

Error codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

RESERV E U N I T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16h/ 56h 164

REW I N D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01h 166

SEEK (CD -R O M m ode). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 B h 1 67

SEN D D IA G NO S T IC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 D h 1 68

St a n dard se l f-t e st . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

SET CAPAC I T Y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 B h 1 70

SET DEVI C E I DE N T IFIER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A 4 h 171

SPACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11h 172

S T A R T/ S T O P (C D -R O M m ode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 B h 1 75

TEST UNIT READY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 00h 176

VER IFY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3h 177

W RITE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0Ah 178

W RITE ATTRIBUTE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Dh 180

W RITE BUFFER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Bh 183

W RITE FILEMARKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10h 186

Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191

Contents

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Related documents

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SCSI Drives

FC Drives

Software design

2 SW Integration: ch. 1

Supporting Ultrium features

Ultrium Format

2 SW Integration: ch. 5

6 Background: ch. 2

General documents and standardization

•

Enhanced Small Computer System Interface (SCSI-2), ANSI X3T9.2-1993 Rev. 10L,

available through ANSI

•

See http:/ / www.t10.org/ t10_main.htm for ANSI SCSI-3 and other specifications

Copies of documents of other standards bodies can be obtained from:

ANSI

11 West 42nd Street

New York,

NY 10036 -8002

USA

ISO

ECMA

CP 56

CH-1211 Geneva 20

Switzerland

114 Rue du Rhône

CH-1204 Geneva

Switzerland

Tel: +41 22 849 6000

Web URL: http:/ / www.ecma.ch

Global Engineering Documents

2805 McGaw

Irvine, CA 92714

USA

Tel: 800 854 7179 or 714 261 1455

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1 Interf ace Implement a tion

HP Ultrium drives use SCSI-3 as the interface to connect to the host system.

This chapter gives an overview of how the interface operates.

Full details of the messages are given in Chapter 2 and of commands in Chapter 3 and

Chapter 4.

The SCSI interface

The Small Computer System Interface (SCSI) is an industry standard, approved by the American

National Standards Institute (ANSI). You are recommended to read the ANSI standard document

in conjunction with this manual. The ANSI specification defines the interface in general while this

document describes the HP Ultrium implementation.

The SCSI implementation provides a drive with a standard set of features and functions. These

include the following:

•

Synchronous data transfers

Asynchronous data transfers

Implementation of all mandatory and most optional commands of the Sequential Access

command set

•

LVD (Low-Voltage differential) SCSI connection

Ultra -320 wide SCSI

Conformance to the following SCSI standards:

•

SAM-2 ANSI INCITS.366:2003

SPI-4 ANSI INCITS.362:2002

SPC3

SSC-2 ANSI INCITS.380:2003

Supported messages

The following messages are supported by the drives:

ABORT

BUS DEVICE RESET

COMMAND COMPLETE

•

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•

DISCONNECT

IDENTIFY

IGNORE WIDE RESIDUE

INITIATOR DETECTED ERROR

MESSAGE PARITY ERROR

MESSAGE REJECT

NO-OP (no operation)

PARALLEL PROTOCOL REQUEST (PPR)

RESTORE POINTERS

SAVE DATA POINTER

SYNCHRONOUS DATA TRANSFER REQUEST

WIDE DATA TRANSFER REQUEST

For implementation details on these messages, see Chapter 2, “Messages”

Supported commands

The following commands are supported by the drives. They include all Mandatory and Extended

commands and most Optional commands.

19h

12h

1Bh

2Bh

4Ch

4Dh

ERASE

03h

44h

REQUEST SENSE

INQUIRY

REPORT DENSITY SUPPORT

LOAD/ UNLOAD

LOCATE

A3h (05h) REPORT DEVICE IDENTIFIER

A0h REPORT LUNS

LOG SELECT

LOG SENSE

A3h (0Ch) REPORT SUPPORTED OP CODES

A3h (0Dh) REPORT SUPPORTED TASK MNGMNT FUNCTNS

56h/ 16h RESERVE UNIT

15h/ 55h MODE SELECT

1Ah/ 5Ah MODE SENSE

01h

1Dh

0Bh

REWIND

5Eh

5Fh

1Eh

08h

8Ch

05h

3Ch

PERSISTENT RESERVE IN

PERSISTENT RESERVE OUT

SEND DIAGNOSTIC

SET CAPACITY

PREVENT/ ALLOW MEDIUM REMOVAL A4h (06h) SET DEVICE IDENTIFIER

READ

11h

00h

13h

0Ah

8Dh

3Bh

10h

SPACE

READ ATTRIBUTE

READ BLOCK LIMITS

READ BUFFER

TEST UNIT READY

VERIFY

WRITE

ABh (01h) READ MEDIA SERIAL NUMBER

WRITE ATTRIBUTE

WRITE BUFFER

WRITE FILEMARKS

34h

1Ch

READ POSITION

RECEIVE DIAGNOSTIC RESULTS

57h/ 17h RELEASE UNIT

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The following additional commands are supported for CD-ROM mode:

08h

28h

25h

43h

2Bh

1Bh

READ TOC

SEEK

READ CAPACITY

START/ STOP UNIT

For implementation details on these commands, see Chapter 3, “Commands—introduction” and

Chapter 4, “Commands”.

SCSI features

Design approach

The features supported by the drive are based on standards, both official and de facto. The drive is

fully compliant with the current SCSI standards: SPC3, SSC2, SAM2, and the relevant transport

protocol (e.g. SPI4 for the parallel SCSI drive). All mandatory commands and features are

supported, as well as some that are optional. In addition, some features from older standards are

still supported for backwards compatibility.

Power-on

The drive will respond to INQUIRY, TEST UNIT READY, REPORT LUNS and REQUEST SENSE commands

within 250 ms of power on. The first command received from an initiator (other than INQUIRY and

REQUEST SENSE) will result in CHECK CONDITION status, with UNIT ATTENTION sense data reported

for the power on. Once the drive has completed its self-test and set-up procedures, it will attempt

to reload any tape that is already present in the drive. It may take some time to recover the tape,

especially if it was positioned near EOM when power was cycled. During tape recovery, medium

access commands will result in a sense key of NOT READY, with additional sense of 0401h (drive

in process of becoming ready).

Reset strategy

The drive supports reset as follows:

•

The current I/ O process is aborted

Any queued I/ O processes from other initiators are removed

All negotiated settings are cleared (parallel SCSI drives only)

Mode parameters are cleared to their default values

Any reservations are cleared (but not persistent reservations)

Any buffered writes are flushed to tape

The logical position becomes undefined, unless Rewind-On-Reset has been configured in

which case the drive will rewind to BOM

SCSI features 13

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•

A UNIT ATTENTION condition is set, based on the type of reset

The drive will respond to INQUIRY, TEST UNIT READY, REPORT LUNS and REQUEST SENSE within

250 ms of the reset line being released. The first command from any initiator (other than INQUIRY,

REQUEST SENSE and REPORT LUNS) will result in CHECK CONDITION status with UNIT ATTENTION

sense data for the reset. Note that all commands will receive BUSY status until the drive has

completed its internal reset.

The Reset button on the front panel and the ACI_RESET_L line on the Automation Controller

Interface are both connected to the Power-Up Reset interrupt on the processor. The effect is

equivalent to power-cycling the drive. The contents of the tape and cartridge memory may not be

consistent after the action and any data in the drive buffer will be lost.

Abort handling

If an abort condition is detected before a command phase completes, the bus is set to bus free and

the command is not executed.

If an abort condition is detected between the end of the command phase and the start of the status

phase, the bus is set to bus free and the processing below is carried out.

If an abort condition is detected during status phase, the bus is set to bus free.

If a command (other than INQUIRY for standard data or REQUEST SENSE) is received after the

abort but before the drive is ready to process the command, the behavior depends on whether

Disconnects are allowed.

•

If disconnects are allowed, the drive will disconnect and wait until the abort processing has

completed before executing the command.

If disconnects are not allowed, a BUSY response will be returned.

Command

ERASE

Abort Processing

Long erase is aborted as quickly as possible without corrupting the tape

format. Short erase completes.

INQUIRY

None

LOAD/ UNLOAD

Load completes and logically positions the tape at BOT.

Unload is aborted leaving the logical position at BOT unless the operation

is past the “point of no return” in which case the tape is ejected.

LOCATE

The logical position is set back to that at the start of the operation.

LOG SELECT

If data transfer is complete, the command is completed, otherwise no action

is taken

LOG SENSE

None

MODE SELECT

If data transfer is complete, the command is completed, otherwise no action

is taken.

MODE SENSE

None

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Command

Abort Processing

PREVENT/ ALLOW

The command completes.

MEDIUM REMOVAL

READ

The logical position is set to that at the start of the operation.

READ BLOCK LIMITS

READ BUFFER

READ POSITION

None

RECEIVE DIAGNOSTICS

RESULTS

RELEASE UNIT

REQUEST SENSE

RESERVE UNIT

REWIND

The command completes.

Sense data is discarded.

The command completes.

SEND DIAGNOSTIC

If data transfer is complete, the command is completed, otherwise no action

is taken

SPACE

The logical position is set back to that at the start of the operation.

None

TEST UNIT READY

WRITE

The logical position is set back to that at the start of the operation.

WRITE BUFFER

If data transfer is complete, the command is completed, otherwise no action

is taken.

WRITE FILEMARKS

VERIFY

The logical position is set back to that at the start of the operation

LUN identification

(parallel SCSI only)

Identify messages are used to identify the LUN being addressed by the initiator, and to identify

which LUN is reselecting the initiator. The old LUN field in the CDB from the SCSI-2 standards is

obsolete and should not be used (set to 0).

Bus parity or CRC errors

If the drive detects a bus parity error in a message out or command phase, it will still accept the

command, which will then return CHECK CONDITION. Additional sense is 4700h (SCSI parity

error). Detection of a parity error during the data out phase also causes the drive to return CHECK

CONDITION. Additional sense is set to 4701h (data phase CRC error detected) if the bus is in DT

mode or 4700h if not.

SCSI features 15

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If Information Units is enabled (parallel SCSI only), the drive will drop the bus on detecting a CRC

error during a LQ_IU. If the CRC error occurs during the Information Units command phase or

data out phase, the drive will return CHECK CONDITION with a CRC error. Additional sense is set to

4703h (Information Unit CRC error detected).

On detecting an Initiator Detected error, the drive will return CHECK CONDITION with additional

sense of 4800h (initator detected error message received). The exception is when Information

Units mode is enabled (parallel SCSI only), when one of the following occurs:

•

If an IDE message is received during a LQ_IU, the drive drops the bus and retries the LQ_IU

pair.

•

If the message is received during Status IU, the drive retries the LQ_Status pair.

If the message is received during Data IU, the drive sends a LQ_Status with CHECK

CONDITION and additional sense of 4800h.

Disconnect strategy

The disconnect strategy used by the drive is based on maximizing the use of the bus for large

sequential data transfers from a large data buffer. The drive will disconnect whenever it believes

that it will provide better bus use. This may be between command and data phases, between

bursts of data or before sending status. However, the drive will guarantee that it sends the

configured maximum burst size or the remaining data in the transfer in any single data phase

burst if the maximum burst size has been set to a value other than zero.

The following diagram gives an overview of the drive’s disconnect strategy:

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CDB arrives

REQUEST SENSE from

an initiator in CA or

INQUIRY with EVPD=0

Yes

Disconnect

priv granted

Yes

Send data

Disconnect

Previous cmd

still in progress?

Yes

Data transfer

required?

Yes

Execute cmd

Reselect

Transfer data &

execute cmd

Send BUSY

status

Send status

Cmd complete

Multi-initiator support

All drives are design to operate within a multi-initiator environment. The maximum number of

concurrently connected initiators is as follows:

•

Parallel SCSI drives: up to 15 initiators

Fibre Channel drives: up to 32 initiators shared across both ports

SCSI features 17

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Sense Data, Unit Attention and Deferred Errors are maintained for each initiator. Mode

Parameters are common to all initiators.

The untagged queuing model implemented by the drives guarantees that all commands are

executed in strict order of receipt. Certain non-media access type commands, such as TEST UNIT

READY, INQUIRY, REQUEST SENSE and REPORT LUNS, are implicitly allowed to queue-jump other

media access type commands, such as REWIND.

The parallel SCSI drive supports the full command queuing model with a queue depth of 1

(necessary for connectivity purposes). The FC drive supports the basic queuing model with a

queue depth of 4. See “Standard Inquiry Data format (LUN0)” on page 40 for details of the BQue

and CmdQue bits which define this support.

Fibre Cha n nel opera t ion

NOTE: This applies only to Fibre Channel drives.

The following sections have information specific to Fibre Channel operation:

•

“Fibre Channel Logical Unit Control mode page” on page 84

“Fibre Channel Port Control mode page” on page 85

“Vital Product Data pages” on page 44

Fibre Channel addressing

Before describing HP’s implementation of Fibre Channel addressing, the concepts of Names and

Addresses need to be clarified.

Names

Names are 64-bit identifiers assigned permanently to the tape drive during manufacture. They are

commonly referred to as World Wide Names since they must be guaranteed unique. The names

are typically used for identifying the device to operating systems, since addresses are assigned

dynamically. There at least eight different name formats distinguished by the Network Address

Authority (NAA). Only one is used on HP Ultrium drives. This is the IEEE Registered Name

(NNA=5) and has the following format:

This name is made up of three fields:

•

NAA Identifier (4 bits). “5” indicates a IEEE Registered Name.

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•

IEEE Company ID (24 bits). Assigned by IEEE to the company.

Vendor Specified ID (36 bits). Assigned by the company.

Addresses

Each Fibre Channel port also has a Port Address which is assigned during loop initialization

and/ or Fabric Login. This is a 24-bit value in the following format:

The AL_PA is the Arbitrated Loop Physical Address. This is normally assigned dynamically during

loop initialization.

If the loop is not attached to a fabric (in other words, when it is private,) the top two bytes will be

zero. If the loop is attached to a fabric, the tape drive is assigned the top two bytes when it logs

into the fabric.

Together, the three bytes provide a unique address on the Fibre Channel fabric that is used for

frame addressing. It forms the equivalent of the Target ID or Initiator ID in SCSI.

HP’s implementation of names and addresses

The HP implementation uses three adjacent IEEE Registered Names:

•

The first (last bits = 00) is used as the Port A World Wide Name.

The second (last bits = 01) is used as the Port B World Wide Name.

The third name (last bits = 10) is used for the Device World Wide Name.

(These are assigned during manufacture from HP’s pool of names, although only the first will

actually be stored in the drive NV-RAM).

The port addresses will be assigned using the ‘standard’ AL_PA initialization mechanisms. The

‘Fibre Channel Port Control mode page’ controls this. The drive has the ability to support hard

addresses as part of this scheme.

Fibre Channel operation 19

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The values of the names can be obtained using the Device Identification Vital Product Information

Page (part of the INQUIRY command).

Implications for libraries

•

Normally a standalone drive will operate using its own ‘hard’ names.

The drive knows it is in a library or other ‘managed’ environment since one of the signal

lines on the ACI (Automation Control Interface) will be tied down.

In this case, the drive will not go on the FC loop until it is told to. The library can optionally

download a new, soft base name (Port A/ Device Name) into the drive at this point. The drive

will then use this as the origin of its names. The library manufacturer would be responsible for

obtaining this IEEE Registered Name. It would be a property of the library, not the drive.

•

If the library wants to ‘warm swap’ drives, it can. It just ‘turns off’ the drive with the soft

name using the ACI and then turns on the spare drive, downloading the same name to it.

If a drive is removed from the library, it will not have the ACI signal tied low and so will

revert to its original hard name. It should forget the soft name in this case.

If the library controller breaks, the drive will time out the ACI interface in ~10 seconds. The

drive still knows it is in a library since the ACI signal is still tied low, so in this case it will

use the soft name last downloaded. This will allow drive access without confusing the host.

Field replaceable units

An FRU code identifies which part of the hardware is considered to have failed. These codes turn

up in sense data byte 14 and as the sense code qualifier for sense codes 4400h (internal target

failure) and 40XX (diagnostic failure).

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Although there are no actual Field Replaceable Units on HP Ultrium drives, the following sub-

assemblies can be replaced at Repair Centres:

•

Drive PCA

•

Head Assembly

Front Panel

Mechanism

CD-ROM emulation

The One Button Disaster Recovery (OBDR) functionality in HP Ultrium drives enables them to

emulate CD-ROM devices in specific circumstances (also known as being in “Disaster Recovery”

mode). The drive can then act as a boot device for PCs that support booting off CD-ROM.

A CD-ROM capable drive can be switched into CD-ROM mode by powering on with the eject

button held down. The drive then alters its behavior as follows:

•

The front panel lights flash a “warbling” sequence.

CD-ROM commands are executed (as opposed to tape drive mode when they would be

rejected). Commands specific to CD-ROM mode are READ 10, READ TOC and READ

CAPACITY. In the case of SCSI commands 08h (READ), 1Bh (LOAD/ UNLOAD) and 2Bh

(LOCATE), these are interpreted as CD-ROM commands 08h (READ 6), 1Bh (START/ STOP)

and 2Bh (SEEK) respectively.

•

Writing is disabled.

Normal INQUIRY data is modified to add a field indicating that the drive supports CD

emulation and to switch the peripheral device type field to indicate a CD-ROM drive.

•

The mode header and mode block descriptor are modified.

A CD-Emulation mode page is added.

Mode data changes to reflect CD-ROM medium type and block size.

Status reporting by the media access check is altered.

The drive’s sense data when the media is not ready for access always indicates “loading”.

If a tape is inserted while the drive is in CD-ROM mode, the drive assumes that it will contain an

image of a CD offset 20 blocks into the tape. It reads the first 250 kilobytes of this image into

buffer space reserved for CD-caching. It then looks for a special message (“EL TORITO

SPECIFICATION”) at the 8th byte of the 18th record of the image. If the drive fails to find this

message, it ejects the tape and waits in CD-ROM mode for a properly-written CD-image tape to

be inserted.

The drive will remain in CD-emulation mode until one of the following occurs:

•

A MODE SELECT command switches it back to tape drive mode using the CD-emulation

mode page.

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•

A SCSI bus reset occurs following the reading of at least 100 blocks of CD-ROM data by a

host.

The user power-cycles the drive or resets it using the forced-eject mechanism.

NOTE: If the drive exits CD-ROM mode through either of the first two of these, the tape will

remain at the last logical position when in CD-ROM mode.

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2 Messages

This chapter includes all SCSI messages, both supported and unsupported. Parts of this chapter

come from Section 5, Logical Characteristics, of the SCSI standards (see page 11 ).

The message system provides an initiator and a target on the SCSI bus with a me a ns of managing

communication. The available messages are listed in this chapter.

Message Out support

Name

Code Support

Abort

06h An abort condition is generated (see “Abort handling” on page 14).

0Ch A reset condition is generated (see “Reset strategy” on page 13).

01h See “Extended Message Support” below.

Bus Device Reset

Extended Message

Identify

80h+ The Identify Out message is sent by the initiator to identify the Logical

Unit to be accessed and to set Disconnect Privilege.

Initiator Detected

Error

05h The initiator has detected a n e r ror in the d a t a b eing sent in a Command,

Data or Status phase. The drive will send a restore data pointers

message to retry the data transfer. (See “Message In support” below for

details).

If the message is received immediately after an Identify message or after

the Command Complete message has been sent, the drive will go Bus

Free.

Message Parity Error

Message Reject

09h The initiator has detected a parity error in a message. The drive will retry

the message. (See “Message In support” below for details).

If the message is received immediately after an Identify message or after

the Command Complete message has been sent, the drive will go Bus

Free.

07h This message is sent when the initiator does not support a message sent

by the drive or that the message is inappropriate. If the message being

rejected is Disconnect, Synchronous Data Transfer Request or Wide Data

Transfer Request, the operation continues without those features. For all

other messages, the message is treated as an Abort message.

If the message is received during a Command, Data or Status phase,

immediately after an Identify message or after the Command Complete

message has been sent, the drive will go Bus Free.

No Operation

08h This message has no effect and is ignored.

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Message In support

Name

Code Support

Command Complete

00h This message is sent by the drive at the end of the status phase to

indicate that a command is complete. Once the message is sent, the

drive releases the bus and goes to Bus Free.

Disconnect

04h This message is sent by the drive to indicate that it is about to

disconnect from the bus and go to Bus Free. During a Data phase, it is

always pre-ceded by a Save Data Pointers message. If a Message

Reject message is received in response to this message, then the

disconnect is prevented.

Extended Message

Identify

01h See “Extended Message Support” below.

8Xh The Identify In message is sent to the initiator during reconnect to

indicate which Logical Unit is reconnecting.

Ignore Wide Residue

23h This message is sent by the drive to the host to indicate that a byte on

a wide bus is not valid.

This is supported whenever a wide transfer is active. It should be sent

at the end of the data phase. The standard action of the drive is to

send this message between the data phase and the status phase with

no disconnect.

Message Reject

Restore Pointers

07h This message is sent to the initiator when the message received by the

drive is unsupported or inappropriate.

03h This message causes the initiator to reset its data transfer pointers to

the values they held when the last save data pointers message was

sent. It will be sent when a parity error is detected on the bus or when

an Initiator Detected Error message is received in order to retry the

data phase.

Save Data Pointers

02h This message instructs the initiator to save its current data transfer

pointers for use with a subsequent Restore pointers message. This

message will always be sent before a Disconnect message during

data phases.

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Extended Message support

Name

Code Support

Synchronous Data

Transfer Request

01h The drive can initiate a Synchronous data transfer negotiation. If the

message is received after selection and before the command phase, it

will then go to message-in phase and respond with a valid response to

complete the negotiation.

Wide Data Transfer

03h The drive can initiate a Wide data transfer negotiation. If the message

is received after selection and before the command phase, it will then

go to message-in phase and respond with a valid response to complete

the negotiation.

Note that SDTR negotiated parameters will become asynchronous after

a WDTR.

Parallel Protocol

Request

04h The drive will never initiate a Parallel Protocol Request transfer

negotiation but will expect the initiator to do so.

If the message is received after selection and before the command

phase, it will then go to message-in phase and respond with a valid

response to complete the negotiation.

Synchronous Data Transfer Request

Extended Message (01h)

Extended Message Length (03h)

SDTR (01h)

Transfer Period Factor

Req/ Ack Offset

Wide Data Transfer Request

Extended Message (01h)

Extended Message Length (02h)

WDTR (01h)

Transfer Width Exponent

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Parallel Protocol Request

Extended Message (01h)

Extended Message Length (06h)

Parallel Protocol Request (04h)

Transfer Period Factor

Reserved (0)

Req/ Ack Offset

Transfer Width Exponent

PComp_En

RTI

Rd_Strm WR_Flow Hold_MCS QAS_Req DT_Req IU_Req

Fields:

Transfer Period

Factor

08h Transfer period of 6.25 ns, Paced Information Unit transfers

09h Transfer period of 12.5 ns (FAST-80). Only valid when DT transfers have

been requested

0Ch Transfer period of 50 ns (FAST-20) — LVD/ SE drives only

19h Transfer period of 100 ns (FAST-10)

32h Transfer period of 200 ns (FAST-5)

Req/ Ack Offset

This has a maximum value of 255.

Transfer Width

Exponent

For ST transfers, this can be either 0 (Narrow) or 1 (Wide).

For DT transfers, it must be set to 1.

PComp_En

RTI

Precompensation enable bit. Supported.

Retain Training Information bit. Supported.

Rd_Strm

Read streaming and read flow control enable bit. Not supported, so the

drive will always return zero.

Wr_Flow

Write flow control enable bit. Not supported; the drive will always return

zero.

Hold_MCS

Hold Margin Control Settings bit. Not supported; the drive will always return

zero.

QAS_Req

DT_Req

QAS enable request bit. Not supported; the drive will always return zero.

This bit determines whether DT mode has been requested, in other words,

packetized data transfers. Supported.

IU-Req

Information units enabled request bit. Supported.

Status

A Status byte is sent from the drive to the host during the Status phase at the end of each

command as specified in the SCSI specification, unless the command has been cleared by an

ABORT message, by a BUS DEVICE RESET message, or by a hard reset.

Messages

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The Status bytes that the drive returns are as follows:

00h

02h

GOOD: This status indicates that the drive has successfully completed the command.

CHECK CONDITION: Any error, exception, or abnormal condition that causes sense data to be

set returns CHECK CONDITION. The REQUEST SENSE command should be sent following

this status to determine the nature of the error.

04h

08h

CONDITION MET: This status will never be returned by an HP Ultrium tape drive.

BUSY: The drive is unable to execute the command at this time. Try again later. The drive tries

to avoid using this status code during normal operation. It can sometimes be used after

commands have been aborted, during power-on and if there are multiple selecting initiators.

10h

14h

18h

INTERMEDIATE: This status will never be returned by an HP Ultrium tape drive.

INTERMEDIATE CND: This status will never be returned by an HP Ultrium tape drive.

RESERVATION CONFLICT: Returned if the drive is reserved by another party. See the

Reservation check.

22h

28h

COMAND TERMINATED: This status will never be returned by an HP Ultrium tape drive.

QUEUE FULL

Status 27

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Messages

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3 Commands—introduction

This chapter contains notes relating to the SCSI commands listed in Chapter .

Summary

The following table is a summary of the SCSI commands for sequential access devices, showing

the operation code:

Opcode

Command Name

Opcode

Command Name

00h TEST UNIT READY

01h REW IND

2Bh

34h

3Bh

3Ch

43h

44h

4Ch

4Dh

55h

56h

57h

5Ah

5Eh

5Fh

8Ch

8Dh

A0h

LOCATE

SEEK (CD-ROM)

READ POSITION

WRITE BUFFER

03h REQUEST SENSE

05h READ BLOCK LIMITS

08h READ

08h READ 6 (CD-ROM)

0Ah WRITE

0Bh SET CAPACITY

10h WRITE FILEMARKS

11h SPACE

READ BUFFER

READ TOC (CD-ROM)

REPORT DENSITY SUPPORT

LOG SELECT

LOG SENSE

MODE SELECT (10)

RESERVE UNIT (10)

RELEASE UNIT (10)

MODE SENSE (10)

PERSISTENT RESERVE IN

PERSISTENT RESERVE OUT

READ ATTRIBUTE

WRITE ATTRIBUTE

REPORT LUNS

12h INQUIRY

13h VERIFY

15h MODE SELECT

16h RESERVE UNIT

17h RELEASE UNIT

19h ERASE

1Ah MODE SENSE

1Bh LOAD/ UNLOAD

1Bh START/ STOP UNIT (CD-ROM)

1Ch RECEIVE DIAG RESULTS

1Dh SEND DIAGNOSTIC

A3h (05h) REPORT DEVICE IDENTIFIER

A3h (0Ch) REPORT SUPPORTED OPCODES

A3h (0Dh) REPORT SUPPORTED TASK MGMNT FNS

A4h (06h) SET DEVICE ID

1Eh

PREVENT MEDIUM REMOVAL

25h READ CAPACITY (CD-ROM)

28h READ 10 (CD-ROM)

ABh (01h) READ MEDIA SERIAL NUMBER

Command details

The command descriptions in Chapter 4 are listed in alphabetical order of command name. Each

command is described briefly. This is followed by a list of pre-execution checks which are

described below. The Command Descriptor Block (CDB) is then given, with details of the various

parameter bits and fields.

Summary 29

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Pre-execution checks

NOTE: In compliance with the SCSI specification, the drive terminates a command with a

CHECK CONDITION status and sets the sense key to ILLEGAL REQUEST when a reserved bit, byte,

field or code is received which is not zero.

Before executing a command, the drive makes a number of checks. They fall into three categories:

•

Checks on the command sent by the host. These ensure that no reserved or fixed fields have

been set to illegal values. They check the syntax of commands, in other words the cross

dependency of fields. For example, the Flag bit must not be set if the Link bit is not set.

•

Checks to ensure that there are no outstanding UNIT ATTENTION or DEFERRED ERROR events

posted for the host that has sent the command.

Checks on media access abilities. These are performed for commands requiring access to

the cartridge. A command is rejected if it attempts to access the cartridge when no

cartridge is present or the cartridge is unloaded.

The checks are described below in alphabetical order. The usual order of execution is Illegal Field,

Fixed Bit, Flag Link, Bad LUN, Reservation, Deferred Error, Unit Attention, Media Access, Media

Write, Diagnostic Status, Humidity, Parameter List.

Bad LUN check

For all commands except INQUIRY 12h, this checks that the LUN specified by the host is zero. The

LUN is taken from the lowest 5 bits of the host’s IDENTIFY message.

•

If no IDENTIFY message is supplied, the LUN is taken from the host’s Command Descriptor

Block.

If an IDENTIFY message is supplied, the LUN in the host’s Command Descriptor Block is

ignored

If the LUN is unsupported, and the host command is not REQUEST SENSE, CHECK

CONDITION is reported to the host with a sense key of ILLEGAL REQUEST, and additional

sense of 2500h (logical unit not supported).

•

If the LUN is unsupported, and the host command is REQUEST SENSE, the original sense

data is replaced with a sense key of ILLEGAL REQUEST, and additional sense of 2500h

(logical unit not supported). This new sense data is returned to the host. Once the

command has completed successfully, the sense data is cleared.

Deferred Error check

A deferred error is generated when a command with immediate report fails after the report has

been returned. The check looks to see if a deferred error exists for the host which sent the

command, in other words, a deferred error for which CHECK CONDITION status has not yet been

Commands—introduction

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reported. If such an error exists, then the drive reports CHECK CONDITION. The sense data for the

command is set to DEFERRED ERROR (which was generated when some previous command failed).

Note that if a UNIT ATTENTION condition and a DEFERRED ERROR condition both exist for an

initiator, the DEFERRED ERROR condition will be reported first. This is because the operation leading

to the deferred error must have been older than that leading to the unit attention. The drive reports

the conditions in the order in which they arose.

Diagnostic Status check

This ensures that the drive is in a fit state to access the media. It does this by checking that there is

no DIAGNOSTIC FAIL status within the drive.

If the drive has failed diagnostics, CHECK CONDITION is reported with a sense key of HARDWARE

ERROR and additional sense of 400Xh (diagnostic failure on component X).

Fixed Bit check

For the READ, VERIFY and WRITE commands, a Fixed bit set to 1 indicates that the length parameter

of the command is for fixed block mode. If fixed block mode is selected then the block size in the

Mode Select block descriptor must not be zero. Otherwise CHECK CONDITION is reported and the

sense data is set as described for the ILLEGAL FIELD check.

Flag Link check

This check ensures that the host has not set the Flag bit in the control byte of the command without

setting the Link bit as well. If the test fails then CHECK CONDITION is reported with a sense key of

ILLEGAL REQUEST and additional sense of 2400h (invalid field in CDB). The Flag field is identified

as the bad field.

Illegal Command check

If the drive does not recognize the opcode of the command that it has been sent, it will do one of

the following:

•

Report CHECK CONDITION status. The sense key will be set to ILLEGAL REQUEST and the

additional sense code will be set to 2000h (invalid command opcode).

Report an invalid field in the command descriptor block. The sense key will be set to ILLEGAL

REQUEST, the additional sense code will be set to 2400h (invalid field in CDB) and the field

pointer in the sense data will be zero.

Illegal Field/ Request check

Checks are performed to ensure the host has not set any of the following in the command

descriptor block:

•

a fixed field

Pre-execution checks 31

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•

a reserved field

the control field

two or more fields to logically conflicting values

If a field has been set to an illegal value:

•

CHECK CONDITION status is reported to the host with a sense key of ILLEGAL REQUEST and

additional sense of 2400h “invalid field in CDB”.

•

The sense key specific bit is set and the sense key specific bytes will be a field pointer.

The command/ data bit is set, indicating that the illegal parameter was in the command.

NOTE: Command descriptor blocks are scanned from left (bit 7) to right (bit 0), and down

(from byte 0 to byte n). The field pointer will be set to point to the first bit of the first illegal field

encountered using this scanning route. In some cases, where multiple fixed fields are

contiguous, the field pointer might be set to point to the first bit of the first fixed field in the

group of fixed fields, whereas the actual illegality may lie in a later bit.

Media Access check

This checks if the drive is able to perform media access commands. If the media is inaccessible

then CHECK CONDITION status is reported with a sense key of NOT READY. The additional sense

will be set to one of the codes associated with the NOT READY key.

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Media Information check

During power-on and following a SCSI reset, knowledge of the whereabouts of the cartridge is

unavailable. It is not possible to execute commands which assume that this knowledge is available

until the drive has recovered from the power-on or reset.

The test checks whether the drive knows if a cartridge is physically present in the drive.

If information about the tape cartridge is not available, the test fails with CHECK CONDITION, a

sense key of NOT READY, and additional sense of 3E00 (logical unit has not self-configured yet).

Media Write check

This checks whether the media is write-protected. If it is, CHECK CONDITION is reported with a

sense key of DATA PROTECT and additional sense of 2700h (write-protected).

Pre-execution checks 33

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Parameter List check

For LOG SELECT, MODE SELECT and some diagnostic commands, the associated data sent to the

drive is in the form of parameter lists. These are described under the command names in the next

chapter. Checks are performed to test the following:

•

Fixed and reserved fields have not been modified. Fixed fields are indicated by a number

in round brackets following the field name.

•

A field has been set to an invalid value.

The syntax of the page of parameters has been violated—for example, where a particular

value in one field imposes limitations on the valid range for another field.

If a field has been set to an illegal value, CHECK CONDITION is reported to the host with a sense

key of ILLEGAL REQUEST and additional sense of 2600h (invalid field in parameter list).

The drive scans the data in the Command Description Block from “left” (bit 7) to “right”, and

“down” (from byte 0 to byte n). It sets the field pointers to the first bit of the first bad field

encountered. If the bad field is contained in a contiguous group of fixed fields, the pointers

indicate the first bit of the first field in the group, even though the error may be in a later field in the

group.

NOTE: With MODE SELECT, the drive checks the integrity of the whole parameter list before acting on

any parameters, so all the mode parameters need to be correct before any of them are implemented.

Reservation check

This checks to see if the drive has been reserved for use by a host, and if it has, whether the host is

the same host that sent the command being executed.

If the drive has been reserved for some other host then RESERVATION CONFLICT status is reported.

See the RESERVE UNIT (page 164) and RELEASE UNIT (page 135) commands.

Unit Attention check

This checks if a UNIT ATTENTION condition exists for the host which sent the command. If it does,

the drive reports CHECK CONDITION status with a sense key of UNIT ATTENTION. The remaining

sense data will be set according to the unit attention condition which exists. See Unit Attention

Sense in the description of the REQUEST SENSE command on page 155.

Commands—introduction

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Command descriptor block

A SCSI command descriptor block (CDB) is a sequence of 6, 10, 12 or 16 bytes sent by a host to

a SCSI target with the bus in command phase. The CDB tells the drive what action should be

performed. The final byte is known as the Control byte.

Group Code

Operation Code

Reserved (0)

(MSB)

Multi-Byte Parameter

Reserved (0)

n−1

(LSB)

Vendor Unique (0)

NACA(0) Flag (0) Link (0)

There are a number of fields in a CDB which are common to all commands. These are shown in

the following table.

Group Code and The operation code uniquely identifies the command. The top three bits of the

Operation Code operation code are known as the group code and these define the length of the

command descriptor block:

Group 0

Group 1

Group 2

Group 3

Group 4

Group 5

Group 6

Group 7

Six-byte commands

Ten-byte commands

Six-byte commands

Sixteen-byte commands

Twelve-byte commands

not supported

Reserved

A reserved field should always be set to zero. The drive checks reserved fields, and if

one is non-zero then it will reject the command with CHECK CONDITION.

Multi-Byte

Parameter

A multi-byte parameter field in a command is “big-endian”, that is, bit 7 of the first

byte of this field is the most significant.

Control

The control field is mainly concerned with the use of linked commands. These are not

supported by the LTO SCSI Command Set, so a CHECK CONDITIO N will be generated

if this field is set to anything other than zero.

Vendor-Unique

NACA

This field is ignored by the firmware

0 The Normal ACA flag is 0, indicating that it is not supported.

Flag

Link

0 Linked commands are not supported.

Command descriptor block 35

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Commands—introduction

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4 Commands

This chapter describes all SCSI commands. Parts of the chapter are based on sections of the SCSI

specification (see page 11).

For general notes on the command descriptions, see Chapter 3.

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ERASE

19h

The ERASE command is used to erase data on tape from the current logical position. The Long bit

is used to decide whether the ‘old’ data is physically overwritten or not. ERASE commands (short or

long) to a drive containing a WORM cartridge will not overwrite or erase user data on tape.

Pre-execution checks:

Illegal Field

Reservation

Deferred Error

Unit Attention

Media Access

Media Write

Diagnostic Status

Command descriptor block:

Operation Code (19h)

Reserved (0)

Control

Immed

Long

2–4

CDB fields:

Immed

The drive reports status after the command has completed.

The drive reports status when it starts the command (after any pre-execution checks and

prerequisite unloads have completed).

Long

The Long bit controls the distance to be erased.

The current position becomes the end of logical data.

End of Data is written, followed by Data Set Separators to the end of the tape.

NOTE: Short erase is only used to truncate data at the current logical position. It cannot be

used to create a “hole” in the tape into which data can subsequently be written “in place”. This

will merely cause the drive to streamfail. The logical tape position is unaffected by this

command. A CHECK CONDITION for Early Warning EOM (drive error code 2C98h) will only be

given if the tape is logically positioned past EOT immediately before the erase.

Erase Specific status:

Event

Status

Key

Additional Sense

The erase fails

CHECK CONDITION HARDWARE ERROR 5100h (erase failure)

WORM media: Erase would

result in user data being over-

written.

CHECK CONDITION DATA PROTECT

300Ch (WORM medium

—overwrite attempted)

Commands

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INQUIRY

12h

INQUIRY tells the drive to return information about the basic operating parameters to the host.

These parameters cannot be changed. The drive returns Inquiry data to the host in a data-in

phase.

NOTE: This command is immune from most of the pre-execution checks that other commands

must pass (for example, it can be executed while the unit is reserved for another host). Unit

attention and deferred error conditions are preserved and reported on subsequent commands.

Pre-execution checks:

Only the Illegal Field Check is performed before the command is executed.

If the EVPD bit is clear, the page code must be zero, otherwise illegal request is reported.

If the EVPD bit is set, the page code must be one of the supported page codes for Inquiry data.

Otherwise illegal request is reported.

Command descriptor block:

Operation Code (12h)

Reserved (0)

LUN

EVPD

Page Code

Allocation Length

Control

CDB fields:

LUN

This field is ignored.

EVPD

Enable Vital Product Data

Normal inquiry data is returned.

A page of vital product data is returned.

INQUIRY 12h 39

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Page Code

If the EVPD bit is zero the Page Code field must be zero.

If the EVPD bit is set to 1, the drive returns the Inquiry page in this Page Code field:

00h Supported Vital Product Pages page

80h Unit Serial Number page

83h Device Identification page

86h Extended Inquiry Data page

C0h Firmware Revision Levels page

C1h Hardware Revision Levels page

C2h PCA Revision Levels page

C3h Mechanism Revision Levels page

C4h Head Assembly Revision Levels page

C5h ACI page

C6h ARM Firmware Revision Levels page

Allocation

Length

The maximum amount of data (in bytes) that should be returned. If more than this is

available, the amount returned is truncated to allocation length. No error is reported.

INQUIRY data pages

Returned data:

INQUIRY returns its standard data if the EVPD bit is zero, or returns a page of data as specified by

the Page Code field when EVPD is one.

Standard Inquiry Data format (LUN0)

This is the data returned by the drive in response to an Inquiry command with its EVPD bit set to

zero. The data also depends on the value of the LUN field in the Inquiry CDB, the LUN value in the

identify message and the configuration of the drive.

Note that the data below is for the standard distribution firmware.

Peripheral Qualifier (000b)

Peripheral Device Type (01h)

Reserved (0)

Version Number (5)

Obsolete NACA(0) HiSup(0)

Additional Length (5Bh)

RMB (1)

Obsolete

Response Data Format (2)

SCCS (0)

BQue(0)

ACC (0)

TPGS (01b)

3PC (0)

Reserved (0)

Obsolete

Protect(0)

Adr16

EncSvr(0)

VS(0)

MultiP(0) MChngr(0)

Obsolete

WBus16

Sync

Linked(0)

Obsolete

CmdQue(1)

VS(0)

(MSB)

Vendor Identification

(“HP “)

(LSB)

(MSB)

Product Identification

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(MSB)

Product Revision Level

(LSB)

Reserved (0)

WORM Version

Reserved (0)

WORM

(MSB)

OBDR string (“$DR-10”) or Reserved (0) if not supported

(LSB)

IUS

Reserved (0)

Clocking

QAS (0)

Reserved (0)

Version Descriptor 1

- - - - - - - -

(LSB)

(MSB)

Version Descriptor 8

(LSB)

Reserved (0)

The Standard Inquiry Data is based on the SCSI 3 standard for Standard Inquiry Data.

For the LUN to which the drive is attached, the Peripheral Qualifier field is set to 000b, the

Peripheral Device Type field is set to 01h, the Removable Medium (RMB) flag is set to 1 and the

Device-type modifier is set to 0.

Inquiry Data fields

Peripheral Qualifier

000b There is a device on the logical unit selected, so the LUN field in the

identify message was 0.

011b The LUN field in the identify message has specified an unsupported

logical unit. This means any LUN other than 0.

Peripheral Device Type 01h Sequential Access Device

05h CD Device (reported when in OBDR mode)

1Fh No Device (the Peripheral Qualifier will be 011b in this case)

RMB

The Removable Medium bit is one, indicating that the tape can be

removed.

Device-Type Modifier

Version Number

This is a six-bit user defined code, set to zero.

The drive complies with the SPC-3 standard.

INQUIRY 12h 41

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NACA

HiSup

The Normal ACA flag is 0, indicating that it is not supported.

The Hierarchical Support flag is 0, indicating that the hierarchical

addressing model is not supported.

Response Data Format

The Inquiry Data format complies with the SCSI-3 standard.

Additional Length

The length in bytes of the length of the rest of the Inquiry data.

SCCS

ACC

No storage array controller component is embedded in the drive.

No Access Controls Coordinator may be addressed through this LUN.

TPGS

01b Target Port Group Support. Only implicit asymmetric logical unit access is

supported.

3PC

Third-Party Copy commands are not supported.

Protection information is not supported.

Protect

BQue

Basic Queuing flag

The flag is zero for SCSI drives, with CmdQue = 1.

The flag is 1 for Fibre Channel drives, with CmdQue = 0.

The drive does not support Enclosure Services command.

Vendor-Specific field—not currently used

EncSvr

MultiP

MChngr

The drives has multiple ports.

The drive is not embedded within or attached to a medium transport

element.

Adr16

WBus16

Sync

16 -Bit Addresses are supported. The flag is only valid for parallel SCSI.

Wide Bus 16 is supported. The flag is only valid for parallel SCSI.

Synchronous data transfer is supported. The flag is only valid for parallel

SCSI.

Linked

The drive does not support linked commands.

For FC drives, with BQue = 1.

CmdQue

For SCSI drives, with BQue = 0.

Vendor

A vendor-specific, 8-byte string of ASCII characters, left justified and padded

Identification

with space characters “HP”.

Product Identification A left-justified, vendor-specific, 16 -byte string field of ASCII characters with

space character padding on the right. The string consists of two parts:

•

First half (bytes 16–23): “Ultrium”

Second half (bytes 24–31): “<generation>-<interface type>”

The following strings have been defined:

Gen 1 SCSI drive: “Ultrium 1-SCSI”

All Gen 2 drives: “Ultrium 2-SCSI”

All Gen 3 drives: “Ultrium 3-SCSI”

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Product Revision Level A vendor-specific string of four ASCII characters: “CNNV”:

• Cis the codename (Gfor a Gen 3 SCSI drive, Lfor Gen 3 FC drive)

• NNare two digits that indicate the build of the variant.

• Vis an ASCII character representing the OEM variant of the code. “D” is the

standard distribution variant.

WORM Version

WORM

The version of WORM supported.

The drive supports the LTO WORM specification.

“$DR-10” if the drive supports Tape Disaster Recovery.

OBDR string

Clocking

For FC drives.

For SCSI drives, indicating that the drive supports both ST and DT

transfers.

QAS

IUS

The drive does not support Quick Arbitration and Selection.

Information Units

Not supported for all drives other than SCSI.

Supported for SCSI drives.

Version Descriptor

These fields can be used to identify up to eight standards to which the drive

conforms. The values supported are listed below.

For SCSI drives, it is recommended that the first version descriptor is used for the

SCSI architecture standard, followed by the physical standard, if any, followed

by the SCSI protocol, followed by the appropriate SPC version, followed by the

device type command set, followed by the secondary command set, if any.

The following are the SCSI version descriptors:

Value

Standard

SAM2 ANSI INCITS.366.2003

5–8

005Ch

0B56h

0300h

037Dh

0000h

SPI4 ANSI INCITS.362:2002

SPC3

SSC2 ANSI INCITS

not used

The following are the FC version descriptors:

Value

Standard

0054h SAM-2 T10/ 1157-D rev 23

0917h FCP-2 ANSI NCITS.332:1999

0D7Ch FC-AL-2 ANSI NCITS.350:200x

0DA0h FC-FS (no version claimed)

131Bh FC-Tape T11/ 1315 revision 1.17

1320h FC-FLA (no version claimed)

0277h SPC-2 ANSI NCITS.351:2001

021Ch SSC ANSI NCITS.335:2000

Vendor Specific data may be sent after the Product Revision Level.

INQUIRY 12h 43

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Vital Product Data pages

The following tables describe the vital product data pages. These pages are returned by the

INQUIRY command when the EVPD bit is set and the appropriate Page Code is set in the

Command Descriptor Block. They contain vendor-specific product information.

Supported Vital Product Data Pages page

This is the data returned by the drive in response to an Inquiry command with its EVPD bit set to

one and its Page Code field set to 0.

This page contains a list of all the VPD page-codes supported by the drive.

Peripheral Qualifier (0)

Peripheral Device Type (1)

Page Code (00h)

Reserved (0)

Page Length (XXh)

Supported Pages Code (00h)

Unit Serial Number page (80h)

Device Identification page(83h)

Extended Inquiry Data page (86h)

Sequential Device Access Capabilities page (B0h)

Firmware Revision Levels page (C0h)

Hardware Revision Levels page (C1h)

PCA Revision Levels page (C2h)

Mechanism Revision Levels page (C3h)

Head Assembly Revision Levels page (C4h)

Auto-Changer Interface Revision Levels page (C5h)

ARM Firmware Revision Levels page (C6h)

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Unit Serial Number page

The Unit Serial Number page contains a single value which is a 10-byte ASCII string. The string,

with the Vendor Identification and Product Identification fields in the standard Inquiry data,

uniquely identifies the drive.

Peripheral Qualifier (0)

Peripheral Device Type (1)

Page Code (80h)

Reserved (0)

Page Length (0Ah)

(MSB)

Serial Number

(LSB)

Device Identification page

The Device Identification page contains information that identifies the tape drive uniquely. For

SCSI, a combination of the Vendor ID and Serial Number is returned. For Fibre Channel, the Port

and Device Names are returned as well

Peripheral Qualifier (0)

Peripheral Device Type (1)

Page Code (83h)

Reserved (0)

Page Length (n−3)

(MSB)

Identification Descriptors

(LSB)

Identification Descriptors are constructed as follows:

Protocol Identifier

Rsvd (0) Association

Code Set

Identifier Type

PIV

Reserved (0)

Identifier Length (n−3)

(MSB)

Identifier

(LSB)

Protocol

Identifier

0h Fibre Channel

1h Parallel SCSI

Code Set

The Identification Descriptor is a binary field.

The Identification Descriptor contains only ASCII data.

INQUIRY 12h 45

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PIV

The Protocol Identifier field is valid. This is set for an Association value of 1.

The Identifier field is associated with the addressed logical unit.

Association

The Identifier field is associated with the port that received the request.

The Identifier field is associated with the SCSI target device that contains the addressed

logical unit.

Reserved

Identifier Type

Vendor ID followed by the product identification field from the standard inquiry data and

the serial number field from the Serial Number Inquiry page.

All devices with a Fibre Channel interface support an Identifier type 3. In this case the

Identification Descriptor is the Fibre Channel 64 -bit Name Identifier.

Defined identifiers

The following identifiers will be returned in the given order. What Port Name is returned depends

on which port the Inquiry is sent to.

Logical Unit Identifier

Protocol Identifier (0)

Rsvd (0) Association (0)

Reserved (0)

Identifier Length (8)

Code Set (1)

PIV (0)

Identifier Type (3)

(MSB)

SSC Device Logical Unit Name (IEEE Registered Name)

(LSB)

Port Name (FC only)

Protocol Identifier (0)

Rsvd (0) Association (1)

Reserved (0)

Code Set (1)

PIV (1)

(MSB)

Identifier Type (3)

Identifier Length (8)

Port Name

(IEEE Registered Name)

(LSB)

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Port Identifier (FC only)

Protocol Identifier (0)

Rsvd (0) Association (1)

Reserved (0)

Code Set (1)

PIV (1)

Identifier Type (4)

Identifier Length (4)

(MSB)

Port Identifier

(LSB)

The Port Identifier will be set to 1 if the addressed port is port A, and set to 2 if the addressed port

is Port B.

Target Name

Protocol Identifier

Code Set (1)

PIV (1)

Rsvd (0)

Association (2)

Reserved (0)

Identifier Type (3)

Identifier Length (8)

(MSB)

Device Name

(IEEE Registered Name)

(LSB)

Target Name

Protocol Identifier

Rsvd (0) Association (2)

Reserved (0)

Code Set (2)

PIV (1)

Identifier Type (1)

Identifier Length (34)

(MSB)

Vendor ID

(LSB)

Product Identification

Serial Number

INQUIRY 12h 47

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Extended INQUIRY Data VPD page

This page provides an application client with a means of obtaining information about the drive.

Peripheral Qualifier (0)

Peripheral Device Type (1)

Page Code (86h)

Reserved (0)

Page Length (3Ch)

Reserved (0)

RTO (0) GRD_CHK(0) APP_CHK(0) REF_CHK(0)

HEADSUP(0) ORDSUP(0) SIMSUP(1)

NV_SUP(0) V_SUP (0)

Reserved (0)

SIMSUP

The drive supports the Simple Task attribute.

Sequential Access Device Capabilities page

This page provides the application client with a means of determining which features are

supported by the Device Server.

Peripheral Qualifier (0)

Peripheral Device Type (1)

Page Code (B0h)

Reserved (0)

Page Length (4h)

Reserved (0)

WORM

Reserved (0)

WORM

The Device Server supports Write Once Read Many (WORM) operation.

Commands

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Drive Component Revision Levels pages

Peripheral Qualifier (0)

Peripheral Device Type (1)

Page Code

Reserved (0)

Page Length (5Ch)

(MSB)

Component (“CCCCCCCCCCCC”)

Version (“RRR.VVV”)

(LSB)

(MSB)

Date (“YYYY/MM/DD hh:mm”)

Variant (“XXXXXXXXXXXX”)

The Drive Component Revision Levels pages contain details of the revisions of each of the major

sub assemblies of the drive. For any given product, if these pages are the same then the drive has

been built with the same components and with the same manufacturing process.

Each entry is a null-terminated ASCII string.

Page Code

Component Name

C0h - Firmware

C1h - Hardware

C2h - PCA

“Firmware”

“Hardware”

“PCA”

C3h - Mechanism

C4h - Head Assembly

C5h - ACI

“Mechanism”

“Head Assy”

“ACI”

C6h - ARM

“IO Firmware”

Component A 12-character entry to identify the component that the revision is for.

Version

A 7-character version code with a three-digit major revision number, a period and a three-

digit minor version number.

Date

The date of the version.

Variant

An identifier indicating what version of the product this is.

INQUIRY 12h 49

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LOAD/ UNLOAD

1Bh

The LOAD/ UNLOAD command allows the host to specify that a tape cartridge present in the drive

is either made ready for data transfer (“loaded”) or disabled for data transfer (if Prevent Media

Removal is set). It can also cause the cartridge to be ejected from the drive (“unloaded”).

Pre-execution checks:

Illegal Field

Reservation

Deferred Error

Unit Attention

Diagnostic Status

Media Information

If an unload is to be performed, the drive checks if the tape is currently being loaded. If it is,

CHECK CONDITION is reported with a sense key of NOT READY and additional sense of 0401h

(becoming ready).

If a load is to be performed, the drive checks to ensure that a tape cartridge is present. If not, it

reports CHECK CONDITION with a sense key of NOT READY and additional sense of 3A00h

(medium not present). If the media is currently being unloaded or ejected, it reports CHECK

CONDITION with sense key of NOT READY and additional sense of 0400h (cause not reportable).

Command descriptor block:

Operation Code (1Bh)

Reserved (0)

Hold

Immed

Reserved (0)

EOT (0)

ReTen

Load

Control

CDB fields:

Immed

The drive reports status after the command has completed.

The drive reports status when it starts the command (after any pre-execution checks and

prerequisite unloads have completed).

Hold

A normal load/ unload will be performed.

A load will cause the cartridge to be pulled in and seated in the drive, but the tape will not

be threaded.

An unload will cause the tape to be unthreaded, but the cartridge will not be ejected.

In Hold position, the Cartridge Memory is accessible.

ReTen This field is ignored.

Load

The drive performs an unload operation.

The drive performs a load operation.

Commands

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Load/ Unload specific status:

Following a successful LOAD command, CHECK CONDITION is posted to all initiators other than the

initiator of the LOAD command. The sense key is set to UNIT ATTENTION, with additional sense of

2800h (not ready to ready transition). There is an exception to this: if a load occurs when the tape

is already loaded, no UNIT ATTENTION sense is generated.

Once UNIT ATTENTION is cleared, unsolicited positional sense is set. The sense key will be NO

SENSE with additional sense of 0004h (BOT detected).

If an unformatted tape is inserted, the drive loads it and it behaves as if it is a blank tape.

If a cartridge with no Cartridge Memory or a failed Cartridge Memory is loaded, CHECK

CONDITION is returned with a sense key of MEDIUM ERROR, with additional sense of 5200h

(cartridge fault).

Loading a cartridge

The drive loads a tape automatically when it is inserted, without any host interaction. If the load is

successful, media access commands are permissible (see the Media Access check).

If the tape is already loaded when a Load request is received, the tape is positioned at the

beginning of the tape (as though a REWIND had been sent). Unlike a “full” load, UNIT ATTENTION

with additional sense of 2800h (not ready to ready transition) is not generated for other hosts.

If the tape is in the process of being loaded when the Load request is received, the drive will wait

for the load to complete and, assuming the load was successful, take one of the following actions:

•

If the Load was issued by the current host (that is, a previous immediate-reported load) and

completed successfully, GOOD status is reported. No further action is taken.

If the Load was issued by some other host (or was an autoload) and completed successfully,

CHECK CONDITION is reported, with a sense key of UNIT ATTENTION and additional sense of

2800h (not ready to ready transition).

•

If the Load was issued by the current host and failed, CHECK CONDITION is reported, since

a deferred error condition will exist for the current host.

If the Load was issued by some other host and failed, the load will be re-attempted on

behalf of the current host.

Unloading a cartridge

If an unload is requested and there is a tape present in the drive (either loaded, loading or

unloading):

1. Any buffered data is written to tape.

2. The tape is rewound to the physical BOM (beginning of media).

3. If medium removal is prevented, CHECK CONDITION is reported with a sense key of ILLEGAL

REQUEST and additional sense of 5302h (medium removal prevented).

LOAD/ UNLOAD 1Bh 51

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4. GOOD status is reported if the tape unloaded successfully. Otherwise, another unload

operation is initiated on behalf of the host that issued the unload request.

Following an unload, any media access commands will be rejected by the Media Access check.

•

If an unload request is received while the tape is in the process of unloading (for example,

as a result of pressing the eject button), it will be queued until the unload is complete.

If an unload request is received while there is no tape present, or if a tape is present but not

loaded and medium removal is prevented, GOOD status is reported.

It is possible to unload and eject the cartridge by pressing the Eject button on the front panel.

Commands

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LOCATE

2Bh

The LOCATE command moves the current logical position to the position specified by the

command. The new position is specified by the offset from start of the media in terms of blocks.

The first block (that is, BOT) is block address 0.

Any unwritten data is written to tape before the command is executed.

Pre-execution checks:

Illegal Field

Reservation

Deferred Error

Unit Attention

Media Access

Diagnostic Status

Command descriptor block (10 -byte version):

Operation Code (2Bh)

Reserved (0)

BT (0)

CP (0)

Immed

Reserved (0)

(MSB)

Block Address

(LSB)

Reserved (0)

Partition (0)

Control

(16 -byte version):

Operation Code (92h)

Dest Type

Reserved (0)

Rsvd (0)

CP (0)

Immed

Reserved (0)

BAM (0)

Partition (0)

(MSB)

Logical Identifier

(LSB)

Reserved (0)

Control

CDB fields:

Block address Type. This field is not supported and should always be set to zero indicating

that the Block Address field represents the count of all blocks and filemarks between the

beginning of the media and the current logical position.

LOCATE 2Bh 53

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Change Partition. This field is not supported and should be set to zero.

Immed

The drive only reports status after the Locate command has completed.

The drive reports status when it starts the command and continues with the positioning in

the background.

BAM

Block

This field is not supported.

The Block Address specifies the number of blocks and filemarks between BOM and the

Address position to be located.

Partition Not supported.

Dest type 00b Specifies that the Logical Identifier field is a logical object identifier.

01b Specifies that the Logical Identifier field is a logical file identifier.

Other values are not supported.

Logical

The specific block on tape to locate. It can be a generic block, either a record or a filemark

Identifier (Dest Type = 00b) or a specific filemark on tape (Dest Type = 01b).

Locate specific status:

Event

Status

Key

Additional Sense

EOD encountered

EOM encountered

CHECK CONDN BLANK CHECK

CHECK CONDN MEDIUM ERROR

0005h (EOD encountered).

0002h (EOT encountered). EOM bit set.

Failed to read data—

media error or non-fatal

drive error

CHECK CONDN HARDWARE ERROR 3B00h (sequential positioning error)

Early Warning EOM

encountered

Early warning end of medium information is not reported for Locate commands

Data format corrupt

CHECK CONDN MEDIUM ERROR

3001h (can’t read media, unknown format)

Commands

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LOG SELECT

4Ch

The Log Select command causes log data on the drive to be reset to its default value or to be set to

an initiator specific value.

Pre-execution checks:

Illegal Field

Reservation

Deferred Error

Unit Attention

Command descriptor block:

Operation Code (4Ch)

Reserved (0)

PCR

SP (0)

Reserved (0)

(MSB)

Parameter List Length

Control

(LSB)

CDB fields:

The following are valid combinations of values for the PCR (Parameter Code Reset), Parameter List

Length and PC (Page Control) fields:

PCR Parameter List Length

Result

01b or 11b All the logs on the drive that can be reset are reset to their

default values.

00b or 10b No action is taken and GOOD status is returned.

01b or 11b Data is sent from the host and is written to the indicated

logs, provided those logs are writable.

Otherwise CHECK CONDITION status is returned, the sense key is set to ILLEGAL REQUEST with

additional sense of 2400h (Invalid Field in CDB).

PCR

Parameter Code Reset. The function performed is defined by the PC field.

The Save Page (SP) flag is not supported and must be set to 0.

LOG SELECT 4Ch 55

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The Page Control field defines the type of parameter values to be selected:

00b No operation is performed. The Parameter List Length must be zero. If it is not, check

or condition invalid field in CDB is set.

10b

01b The drive will clear logs as specified by the parameter data.

11b The drive will clear all of its internal logs.

Parameter

List Length

No data is to be transferred. This is not considered an error.

>0 Specifies how many bytes of parameter data are to be sent. The data transferred will

consist of zero or more 4 -byte log page headers with the page length in those

headers set to zero. For each log page header received, the drive clears the

associated log.

Commands

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LOG SENSE

4Dh

LOG SENSE allows the host to read the drive’s logs. A single log is returned with each invocation of

LOG SENSE.

Pre-execution checks:

Illegal Field

Deferred Error

Unit Attention

The Page Code must match one of the supported log page codes. If it does not, then CHECK

CONDITION status is reported. Sense data will be as described in the Illegal Field Checks.

Command descriptor block:

Operation Code (4Dh)

Reserved (0)

PPC (0)

SP (0)

Page Code

Reserved (0)

Parameter Pointer

(MSB)

Allocation Length

Control

(LSB)

CDB fields:

The Page Control field defines the type of log parameter to be returned:

00b Current Threshold Values—any parameters in the log that are counters contain

the maximum value that they can count to.

01b Current Cumulative Values—any parameters in the log that are counters contain

their current counts.

NOTE: Counts are reset to their default cumulative values (see below) following a

power-on, reset or bus device reset. Media related counts are also reset following

a load.

10b Default Threshold Values—same as the Current Threshold Values

11b Default Cumulative Values—any parameters in the log that are counters contain

the initial values of those counters (set at power-on, reset, bus device reset and, in

the case of media logs, load).

The PC field has no effect on the data returned when the selected log contains event or

trace codes rather than counts.

Page Code

The Page Code field identifies which log page is being requested by the host. See

page 59 for the list of valid page codes.

LOG SENSE 4Dh 57

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Parameter

Pointer

All parameters are returned.

Parameter data of a specified log page is returned in ascending order

beginning from this code. If this code is larger than the largest

parameter in the page, the drive will return CHECK CONDITION with

additional sense of 2400h (Invalid Field In CDB).

Allocation

Length

The Allocation Length field specifies the maximum number of bytes of data that should

be returned to the host. The drive will return the entire log or Allocation Length bytes,

whichever is the lesser.

Log page format

All log pages except Page 0 consist of a page code header followed by a number of parameters.

The page header has the following format:

Page Code

Reserved (0)

(MSB)

Page Length

(LSB)

The Page Code specifies which Log page is being returned. The Page Length indicates the number

of additional bytes in the parameters.

For the Log Select command only, the four bytes shown above are sent for each log page to be

cleared. The Page Length field should be set to zero.

For the Log Sense command one or more parameters is sent. See the actual page descriptions

above for more information. Note that all the parameters for a particular page must be sent. Each

parameter has the following format:

(MSB)

Parameter Code

(LSB)

DU (0)

(MSB)

DS (1)

TSD (0) ETC (0)

TMC(0)

Rsvd (0)

LP (0)

Parameter Length (n−3)

Parameter Bytes

(LSB)

Parameter Code

A two-byte value that uniquely identifies the parameter within the log.

DU, TSD, ETC, TMC

and LP

Must be zero. For a full description of these fields refer to the SCSI-2

standard.

Must be 1, indicating that drive will maintain the saving of data itself. Note

that the host must set the SP bit to 1 in a LOG SELECT command, otherwise a

CHECK CONDITION will result.

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Parameter Length

Parameter Bytes

The length of Parameter Bytes in bytes.

The actual parameter data.

Supported Log Pages page

This SCSI log may be recovered using a Log Sense command with the PC field set to anything and

the Page Code field set to 00h. The page lists the page codes of other logs supported by the drive.

It can neither be reset nor written.

The page has the following format:

Reserved (0)

Page Code (00h)

Reserved (0)

(MSB)

Page Length (0Dh)

(LSB)

Supported Pages (00h)

Write Error Counters (02h)

Read Error Counters (03h)

Sequential Access Device Log (0Ch)

Temperature (0Dh)

DTD Status (11h)

Protocol Specific (18h)

TapeAlert Log (2Eh)

Tape Usage Log (30h)

Tape Capacity Log (31h)

Data Compression Log (32h)

Performance Log (34h)

Device Status Log (3Eh)

LOG SENSE 4Dh 59

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Write Error Counters log page

The Write Error Counters log is page 02h. The Page Length is 38h. There are seven parameters, 0

through 6. All fields are four bytes long.

All these counters are updated when the data set is physically written. They relate to the current

tape and are cleared when the tape is unloaded.

Parm. Definition

Description

Errors corrected without substantial delay Total number of errors corrected without delay

Errors corrected with possible delays

Total

Total number of errors corrected using retries

Sum of parameters 3 and 6

Total errors corrected

The number of data sets that needed to be rewritten

Number of CCQ sets rewritten

Total times error correction processed

Total data sets processed

Total uncorrected errors

The total number of data sets written

The number of data sets that could not be written

This data can be reset to zero, but not written.

Read Error Counters log page

The Read Error Counters log is page 03h. The Page Length is 38h. There are seven parameters, 0

through 6. All fields are four bytes long.

All these counters are updated when the data set is physically read. They relate to the current tape

and are cleared when the tape is unloaded.

Parm. Definition

Description

Errors corrected without substantial delay Total number of errors corrected without delay

Errors corrected with possible delays

Total

Total number of errors corrected using retries

Sum of parameters 3 and 6

Total errors corrected

The number of data sets that were corrected after a

read retry

Total times error correction processed

Total bytes processed

Number of times C2 correction is invoked

The total number of data sets read

Total uncorrected errors

The number of data sets that could not be read after

retries

This data can be reset to zero, but not written.

Commands

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Sequential Access Device log page

The Sequential Access Device Log page is page 0Ch. The Page Length is 40h. Five parameters are

supported, all eight bytes long. With the exception of 0100h (cleaning required), they are

updated when a data set is logically written and cleared at the start of tape load; the values of

each parameter relate to the current tape.

Parm. Description

0001h The number of data bytes received from application clients during write command operations.

This is the number of bytes transferred over SCSI, before compression.

0002h The number of data bytes written to the media as a result of write command operations, not

counting the overhead from ECC and formatting. This is the number of data bytes transferred to

media, after compression.

0003h The number of data bytes read from the media during read command operations, not counting

the overhead from ECC and formatting. This is the number of data bytes transferred from media

with compression.

0004h The number of data bytes transferred to the initiator or initiators during read command

operations. This is the number of bytes transferred over SCSI, after decompression.

0100h Cleaning required, a non-volatile cleaning indication.

A non-zero value of parameter 0100H (cleaning required) relates to the drive It indicates that a

condition requiring cleaning has been detected and a subsequent cleaning cycle has not yet been

completed. The parameter is updated asynchronously. It persists across hard resets and power

cycles, and is cleared when a cleaning cycle is performed.

LOG SENSE 4Dh 61

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Temperature log page

The Temperature Log page is page 0Dh. The following parameters are supported:

Parm. Description

0h The current temperature of the drive in ºC (binary value). If the temperature is less than 0, 0 is

reported. If the temperature sensor is not functioning properly, FFh is reported.

1h The maximum temperature in ºC (binary value) at which the drive can operate continuously

without degrading reliability and operation. This parameter is not supported so FFh is returned.

Page Code (0Dh)

Reserved (0)

(MSB)

DU (0)

Page Length (0Ch)

(LSB)

Parameter Code (0000h)

(LSB)

DS (1)

TSD (0) ETC (0)

TMC (0)

LBIN (1)

LP (1)

Parameter Length (2h)

Reserved (0)

Temperature (ºC)

(MSB)

Parameter Code (0001h)

(LSB)

DU (0)

DS (1)

TSD (0) ETC (0)

TMC (0)

LP (1)

Parameter Length (2h)

Reserved (0)

Reference Temperature (ºC)

DTD Status log page

The Data Transfer Device (DTD) Status Log page is page 11h. The following parameters are

supported:

Parm.

0000h

0001h

Description

Very High Frequency data

Very High Frequency polling delay

0100h–01FFh DTD Primary Port status

Commands

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Very High Frequency Data (VHF)

(MSB)

Parameter Code (0000h)

(LSB)

DU (0)

DS (1)

TSD (0) ETC (0)

TMC (0)

LBIN (1)

LP (1)

Parameter Length (4h)

Rsvd (0)

InXtm

HIU

MAcc

RAA

Cmpr

WrtP

CRqst

CRqrd

MThrd

DInit

Rsvd (0)

MPrsnt

Rsvd (0) MStd

DAcc

Tape Motion Status

Reserved (0)

IntfC

TAFC

RRqst

HIU

Host Initiated Unload bit

If set, the MAM is accessible. MPrsnt must be set as well.

Compress bit. If set, the DTD currently has data compression enabled.

MAcc

Cmpr

WrtP

Write Protect bit. If set, the media in the DTD is physically write-protected. Only valid if

MPrsnt is set.

CRqst

CRqrd

Clean Requested bit

Cleaning Required. If set, head cleaning must be performed before normal data

operations are possible. This takes priority over CRqst, and both may be set at the

same time.

DInit

DTD Initialized. When set, the data returned by the VHF parameter data is valid.

InXtn

In Transition. If 0, the DTD is in the state reflected by the rest of byte 5 and is not

attempting to leave this state. This bit must be 0 if RRqst is set.

RAA

Robotic Access Allowed. If set, robotic media access to the DTD is allowed.

Media Present bit (hardware sensor)

MPrsnt

MStd

Media Seated. If set, the tape is mechanically seated, that it physical loading is

complete. Otherwise the tape is still threading.

MThrd

DAcc

Media Threaded

Data Accessible. If set, the DTD has finished processing a load operation. The bit is

cleared to 0 at the beginning of the next unload operation.

Tape Motion

Status

No tape motion

00h

01h

02h

03h

04h

Cleaning operation in progress

Tape being loaded

Tape being unloaded

Tape in motion

Reading

05h

06h

Writing

07h

Locating

08h

09h–7Fh

80h–FFh

Rewinding

Reserved

Vendor unique

LOG SENSE 4Dh 63

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RRqst

IntfC

TAFC

Recovery Requested. Set to 1 as long as a recovery procedure is available. In these

circumstances, InXtn must be 0.

Interface Changed. If set, the interface status has changed since the last time this page

was retrieved. It is cleared to 0 when the page is retrieved for the initiator.

If set, at least one TapeAlert Flag had Changed since the last time the TapeAlert flags

were retrieved.

Very High Frequency Polling Delay

(MSB)

Parameter Code (0001h)

(LSB)

DU (0)

(MSB)

DS (1)

TSD (0) ETC (0)

TMC (0)

LBIN (1)

LP (1)

Parameter Length (2h)

VHF Polling Delay

(LSB)

The VHF Polling Delay is 16 milliseconds.

DTD Primary Port Status

Parallel SCSI

(MSB)

Parameter Code (0101h)

(LSB)

DU (0)

DS (1)

TSD (0) ETC (0)

Parameter Length (4h)

Reserved (0)

TMC (0)

LBIN (1)

LP (1)

Current Bus Mode Rsvd (0)

Reserved (0)

Most Recent Transfer Period Factor

Current SCSI Address

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Fibre Channel

Port 0

(MSB)

Parameter Code (0101h)

(LSB)

DU (0)

DS (1)

TSD (0) ETC (0)

TMC (0)

LBIN (1)

Signal

LP (1)

Parameter Length (8h)

CrrTop

(MSB)

Current Speed

Current N_Por_ID

Reserved (0)

Conflict

PIC

(LSB)

8–10

Rsvd

Current FC_AL Loop ID

Port 1

(MSB)

Parameter Code (0102h)

(LSB)

DU (0)

DS (1)

TSD (0) ETC (0)

TMC (0)

LBIN (1)

Signal

LP (1)

Parameter Length (8h)

CrrTop

(MSB)

Current Speed

Current N_Por_ID

Reserved (0)

Conflict

PIC

(LSB)

8–10

Rsvd

Current FC_AL Loop ID

TapeAlert log page

The TapeAlert log page is page 2Eh. There are 64 parameters numbered from 1 through 64. Only

parameters 1 through 18, 20 through 23, 29 through 39 and 55 have definitions for tape drives

without attached loaders. The remaining parameters are always zero.

NOTE: Parameters 24–28, 50–54, 56–58 have recently been added to the list and may or

may not be supported.

The Parameter Control Byte value for each parameter is 40h.

All parameters are one byte long. Each parameter is either zero to indicate the corresponding

condition has not occurred or one to indicate that the corresponding condition has occurred. All

log parameters are cleared when the log is read. The Log is also cleared at power on, on a reset

LOG SENSE 4Dh 65

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condition and by a Log Select command. Specific flags may be cleared when corrective action has

removed the condition that caused the flag to be set.

The supported parameters are as follows:

Parameter Description

Type

Warning

Critical

Read Warning

Write Warning

Hard Error

Media

Read Failure

Critical

Write Failure

Critical

Media Life

Warning

Critical

Not Data Grade

Write-Protect

No Removal

Information

Critical

Cleaning Media

Unsupported Format

Recoverable Snapped Tape

Unrecoverable Snapped Tape

Memory in Cartridge Failure

Forced Eject

Critical

Warning

Critical

Read-Only Format

Tape Directory Corrupted

Nearing Media Life

Clean Now

Warning

Information

Critical

Clean Periodic

Warning

Critical

Expired Cleaning Media

Invalid Cleaning Cartridge

Retension Requested

Dual-port Interface Error

Cooling Fan Failure

Power Supply Failure

Power Consumption

Drive Maintenance

Hardware A

Critical

Warning

Critical

Hardware B

Critical

Interface

Warning

Critical

Eject Media

Download Fault

Drive Humidity

Warning

Commands

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Parameter Description

Drive Temperature

Type

Warning

Critical

Drive Voltage

Predictive Failure

Diagnostics Required

Warning

Critical

Lost Statistics

Tape Directory Invalid at Unload

Tape System Area Write Failure

Tape System Area Read Failure

No Start of Data

Critical

Loading Failure

Critical

Unrecoverable load Failure

Automation Interface Failure

Firmware Failure

Critical

Warning

WORM medium — integrity check failed

WORM medium — overwrite attempted

Tape Usage log page

The Tape Usage log page code is 30h. There are nine parameters. These are all read directly from

the LTO-CM Tape Usage Log.

This data relates to the current tape and can be neither reset nor written.

Parm. Description

Length Updated When

Thread Count

Tape threaded

Total Data Sets Written

Total Write Retries

Data set physically written

Total Unrecovered Write Errors

Total Suspended Writes

Total Fatal Suspended Writes

Total Data Sets Read

Total Read Retries

Total Unrecovered Read Errors

LOG SENSE 4Dh 67

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Tape Capacity log page

The Tape Capacity log page code is 31h. The Page Length is 20h. There are four parameters, 1

through 4. Parameters 2 and 4 are not supported and are returned as zero. All parameters are 4

bytes long. All parameters are in megabytes (1,048,576 bytes) and assume no compression. This

data relates to the current tape and can be neither reset nor written.

The supported parameters are as follows:

Parm. Description

Length Updated When

Main Partition Remaining Capacity

Data set physically written

Alternate Partition Remaining Capacity

Main Partition Maximum Capacity

Alternate Partition Maximum Capacity

n/ a

If Set Capacity succeeds

n/ a

Data Compression log page

The Data Compression log page code is 32h and the page length is 4Ch. There are ten

parameters, 0 through 9. Parameters 0 and 1 are two bytes long. Parameters 2 through 9 are

each 4 bytes long.

The supported fields are listed below. Parameters 2 through 9 occur as pairs that represent a large

number of bytes transferred. The first four-byte parameter represents the number of whole

megabytes transferred, rounded to the nearest megabyte. The second four-byte parameter

represents the difference between this number of megabytes and the actual number of bytes. This

may be a signed quantity.

This data relates to the current tape and is cleared at the start of tape load. It may not be written.

Parameter Description

Length

Updated When

Read compression ratio X 100

Data set logically read

Data set logically written

Data set logically read

Data set logically written

Write compression ratio X 100

Megabytes transferred to host

Bytes transferred to host

Megabytes read from tape

Bytes read from tape

Megabytes transferred from host

Bytes transferred from host

Megabytes written to tape

Bytes written to tape

Commands

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Performance Data log page

The Performance Data log page is 34h. This log is intended to report data of interest to a user/

application on how efficiently the drive is being used.

Parameter Description

Length Updated

Repositions per 100 MB

After each 100 MB has been physically written

Data rate into buffer

Maximum data rate

Current data rate

Native data rate

After each data set has been logically written

Fixed

The Parameter Control Byte is 60h for all the parameters.

All the parameters relate to the current tape. They are all cleared at the start of tape load, except

Parameter 4, which is never cleared. All data will be reset when the log page is reset. The

parameters are as follows.

Repositions per 100 MB

Number of tape direction changes per 100 MB written. The higher the figure the more

wear occurs.

Data rate into buffer

Maximum data rate

Rate at which data is entering the buffer (after data compression), given in units of

100 KB/ s. This is the true ‘tape’ data rate.

Given the compressibility of the data that has been sent to the drive, this is the

maximum data rate that could be achieved, given in units of 100 KB/ s. The figure is

calculated based on the compressibility of each dataset received, and datasets that

have a compressibility greater than the compression bandwidth of the drive will be

‘capped’.

Current data rate

Native data rate

Rate at which data is being accepted by the drive before compression, given in units of

100 KB/ s.

The native rate (that is, without using compression) at which the drive writes data to

tape, given in units of 100 KB/ s:

Drive

Value

Native Data Rate

Generation 1 full-height

Generation 1 half-height

Generation 2

96h

4Bh

12Ch

230h

15 MB/ s

7.5 M B/ s

30 MB/ s

80 MB/ s

NOTE: These figures are for

native media types and will

vary when earlier format

media is loaded

Generation 3

LOG SENSE 4Dh 69

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Device Status log page

The Device Status log page is 3Eh, with a page length of 28h. PCB = Parameter Control Byte.

Parameter Description

Length Updated

PCB

40h

Device Type

Obsolete. Set to all zeros.

Device Status Bits

Used to provide remote status of selected

monitoring points on the drive. See below for the

format.

Total Number of Loads

Number of loads/ unloads over the life of the

device.

60h

Cleaning Cartridge

Status

Accumulated number of uses of the last cleaning 40h

cartridge. Updated after the tape is loaded and

a cleaning event attempted. If there is no value,

FFFFFFFFh is returned.

Product Number

Unique number that identifies the product

40h

Device Status Bits

The parameter has the following format:

Reserved (0)

CRQ

ECT

Reserved (0)

Temperature

Device Status

Medium Status

CRQ

Cleaning Required flag

Cleaning Requested flag

ECT

Exhausted Cleaning Tape flag

Temperature

00b Field not supported

01b Temperature OK

10b Temperature degraded

11b Temperature failed

Device Status

The overall status of the drive:

00b Field not supported

01b Device status OK

10b Device status degraded

11b Device status failed

Medium Status The overall status of the tape cartridge:

00b Field not supported

01b Medium status OK

10b Medium status degraded

11b Medium status failed

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MODE SELECT

15h/ 55h

MODE SELECT is used to send configuration data to the drive. Both 6-byte and 10-byte versions of

the command are supported.

The Mode Select parameter list is transferred from the host to the drive during the data-out phase.

It contains zero or more bytes of information. If any information is sent, it should consist of a Mode

Parameter Header followed by zero or more mode select pages. Internal parameters are set

according to the values specified in the header and pages. Fields in the parameter list are checked

and the operation will terminate if an error is found.

NOTE: The drive does not check that the parameter list is correct before modifying internal

parameters. The list is checked as the operation proceeds, so if there is an error in the list, all

parameters up to that point will be set to their new values, but the parameter in error and later

parameters will not be updated.

Pre-execution checks:

Illegal Field

Reservation

Deferred Error

Unit Attention

NOTE: Failure to flush write-behind data will be reported as a Deferred Error.

The parameter list length must be such that only “entire” parts of a parameter list are sent. It is

illegal to send a partial mode parameter header, a partial mode block descriptor or a partial

mode page. If this happens, then CHECK CONDITION status is reported. The sense key is set to

ILLEGAL REQUEST. The additional sense is set to 1A00h (parameter list length error).

Extra checks may be performed on the data, see the descriptions for the parameter list for more

details.

Command descriptor block

6-Byte version

Operation Code (15h)

Reserved (0)

SP (0)

Reserved (0)

Parameter List Length

Control

MODE SELECT 15h/ 55h 71

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10-byte version

Operation Code (55h)

Reserved (0)

SP (0)

(LSB)

(MSB)

Reserved (0)

Parameter List Length

Control

CDB fields:

Page Format

The MO DE SELECT parameter data is not SCSI-2 mode page compatible. Only

the parameter header and block descriptor may be sent.

The parameter data is SCSI-2 mode-page compatible.

Save Pages

This bit is not supported and must be zero.

No data is transferred.

Parameter List

Length

>0 The length in bytes of the MODE SELECT parameter list to be transferred.

Specific status:

Following a successful Mode Select command, Unit Attention status is posted to all initiators other

than the initiator of the Mode Select command. The sense key is set to UNIT ATTENTION. Additional

sense is set to 2A01h (mode parameters changed).

Mode parameter pages

Mode data is recovered from the drive by means of a MODE SENSE command. After modification,

it is returned to the drive via a MODE SELECT command. In real-life, many hosts do not use MODE

SENSE and return whatever MODE SELECT data suits them into the drive.

Commands

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Mode page representation

Certain conventions are used in the following Mode Parameter pages in order to describe the

nature of the parameters. Most parameters are given by name, followed by a number in brackets.

The brackets have the following meanings:

Square brackets [ ] Square brackets indicate that the parameter may be modified. The number inside the

brackets is the default value for the field—in other words, the power-up or reset

value.

•

MODE SELECT may modify this value by sending the page with a new value in

the field.

•

MODE SENSE (current values) will return the current value of the parameter.

MODE SENSE (default values) will return the value in brackets [].

MODE SENSE (changeable values) will return a value of all ones.

Round brackets ( ) Round brackets indicate that the parameter is fixed. The number inside the brackets is

the fixed value for the field.

•

MODE SELECT must set the parameter to this value, otherwise CHECK

CONDITION will be reported with a sense key of ILLEGAL REQUEST.

•

MODE SENSE (default values) will return the fixed value.

MODE SENSE (changeable values) will return a value of all zeros.

Mode data format

Mode data consists of a 4-byte header, optionally followed by block descriptor and Mode

Parameter pages:

(MSB)

Mode Parameter Header

Mode B l o ck Descriptor

Mode Parameter Pages

(LSB)

(MSB)

Mode para m eter p a ges

HP Ultrium drives support the f o l lowing p a ges:

•

01h “Read-Write Error Recovery mode page” on page 76

02h “Disconnect-Reconnect page” on page 78

0Ah “Control mode page” on page 79

0Fh “Data Compression log page” on page 68

10h “Device Configuration page” on page 81

11h “Medium Partitions mode page” on page 83

MODE SELECT 15h/ 55h 73

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•

18h (FC drives only) 18h (SCSI drives only) “SCSI LUN Control mode page” on page 84

19h (FC drives only) 19h (SCSI drives only) “SCSI Port Control Mode page” on page 87

1Ch “Information Exceptions mode page” on page 91

3Ch “Device Time Mode Page” on page 92

3Fh OBDR FW variants only: “CD-ROM Emulation/ Disaster Recovery mode page” on

page 94

•

Return all pages (page 3Fh) — for MODE SENSE only

Mode parameter header

The Mode Parameter header must always be sent at the start of Mode Select data. It is always

returned at the start of Mode Sense data.

6-byte header

The 6-byte Mode Parameter header has the following format:

Mode Data Length

Medium Type [00h or 01h if WORM media is loaded or 80h if in CD-ROM mode]

WP Buffered Mode [001b] Speed (0)

Block Descriptor Length

10-byte header

The 10-byte Mode Parameter header has the following format:

(MSB)

Mode Data Length

(LSB)

Medium Type [00h or 01h if WORM media is loaded or 80h if in CD-ROM mode]

Buffered Mode [001b]

Speed (0)

Reserved (0)

(MSB)

Block Descriptor Length

(LSB)

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Header fields

Mode Data Length MODE SELECT: Mode Data Length field must be zero.

MODE SENSE: Mode Data Length field is set to the number of bytes of data available to

return excluding itself (in other words, the number of actual bytes available is

mode data length + 1 for 6 -byte MODE SENSE or +2 for 10 -byte MODE

SENSE).

NOTE: The actual amount returned may be truncated to the allocation length

for the command.

Medium Type

00h The usual medium type when the drive is in normal tape drive mode.

01h WORM media is loaded

80h The tape drive is in CD-ROM emulation mode for OBDR.

Write Protect. Ignored for MODE SELECT.

MODE SENSE: The tape is write-enabled

MODE SENSE: The tape is write-protected

Buffered Mode

The drive will not report GOOD status on Write and Write Filemarks commands until all

data (blocks and filemarks) has been successfully written to tape.

The drive will report GOOD status for Write and Write Filemarks commands as soon as

all the data or marks specified in the command have been transferred to the data

buffer. Data for multiple commands from different initiators may be buffered. This is the

default value.

NOTE: It is strongly recommended that this field is set to 1, otherwise there will be

significant performance penalties. A method of flushing the buffer to tape without

changing logical position is available with the Write Filemarks command.

The drive will report GOOD status for Write and Write Filemarks commands as soon as

all the data or marks specified in the command have been transferred to the data

buffer and all buffered data from different initiators has been successfully written to the

tape.

Speed

The Speed field is not used and should be zero.

Block Descriptor

Length

Only the values 0 and 8 are valid. Any value other than 0 or 8, CHECK CONDITION status is

reported. See the Parameter List check for details of the sense data generated.

No block descriptor is being transferred.

The Mode Parameter header must be followed by the 8-byte block descriptor

described in the next section.

MODE SELECT 15h/ 55h 75

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Mode block descriptor

The format of the Mode Parameter block descriptor is as follows:

Density Code

Number of Blocks (0)

Reserved (0)

(MSB)

(LSB)

(MSB)

Block Length [0 or 800h]

Mode Parameter block descriptor fields:

Density Code

This specifies the format of the media loaded in the drive. See “REPORT DENSITY

SUPPORT 44h” on page 137 for details.

Block Length

This indicates the size of fixed blocks for fixed mode Read and Write commands. It is

also used in the decision process on whether to report an illegal length record on reads.

00h

The default value when the drive is in normal tape drive mode.

800h The tape drive is in CD-ROM emulation mode for OBDR.

Read-Write Error Recovery mode page

The Read-Write Error Recovery mode page has the following format:

PS (0)

Rsvd (0)

Page Code {01h}

Additional Page Length {0Ah}

TB (0) Res (0) EER (1) PER [0] DTE (0) DCR (0)

Reserved (0)

Read Retry Count

Reserved (0)

4–7

Write Retry Count

Reserved (0)

9–11

Read-Write Error Recovery page fields:

Transfer Block

Always set to 0, meaning that an unrecoverable data block will not be

transferred to the host.

EER

Enable Early Recovery

The drive should attempt error correction before performing retries.

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PER

Post Error. Although this bit is changeable, the drive’s internal behavior always

corresponds to PER=0.

The drive does not report CHECK CONDITION for recovered errors. The DTE

bit must also be zero.

The drive reports CHECK CONDITION for recovered errors.

DTE

Disable Transfer on Error

Always set to 0, meaning that the drive will not terminate the transfer for errors

recovered within the limits established by the read-write error parameters.

DCR

Disable Correction

Always set to 0, meaning that the use of error correction codes for error

recovery is allowed.

Read Retry Count The number of times the drive will attempt its recovery algorithm during a read

operation before reporting an unrecoverable error.

The drive will not use its recovery algorithm during read operations.

15h The drive will attempt 21 retries.

Write Retry Count The number of times the drive will attempt its recovery algorithm during a write

operation before reporting an unrecoverable error.

The drive will not use its recovery algorithm during read operations.

0Ah The value for all Ultrium drives, giving 10 retries.

MODE SELECT 15h/ 55h 77

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Disconnect-Reconnect page

SCSI drives

The Disconnect-Reconnect page has the following format for SCSI drives:

PS (0)

Rsvd (0)

Page Code {02h}

Additional Page Length {0Eh}

Buffer Full Ratio (0)

Buffer Empty Ratio (0)

(MSB)

Bus Inactivity Limit (0)

Disconnect Time Limit [0]

Connect Time Limit (0)

Maximum Burst Size [0]

(LSB)

13–15

Reserved (0)

DTDC (0)

Disconnect-Reconnect page fields:

Buffer Full Ratio

Buffer management is controlled by the drive, so this should always be zero.

This parameter is not supported and should be zero.

Connect Time Limit

Bus Inactivity Limit

Disconnect Time Limit

Connect Time Limit

Maximum Burst Size

This parameter is not supported and should be zero.

>0 The maximum amount of data that will be transferred during a data-in or

data -out phase before disconnecting. This field is in units of 512 bytes. The

maximum burst size that the drive supports is 127 (7Fh) blocks of 512 bytes,

that is, 64 KB less 512 bytes.

The drive may send bursts of any size. This is the default value.

DTDC

The Data Transfer Disconnect Control field is not supported and should be

zero.

NOTE: If the host does not grant disconnect privilege in its IDENTIFY message these

parameters become meaningless. The drive will stay connected on the bus for the duration of

an operation or until the host sends a mid-operation IDENTIFY granting disconnect privilege.

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Control mode page

The Control Mode page is defined as follows:

PS (0)

Rsvd (0)

Page Code {0Ah}

Page Length {0Ah}

Reserved (0)

Rsvd (0)

TST (0)

GLTSD(0)

RECL (0)

Queue Algorithm Modifier (0)

Rsvd (0) RAC [0] Reserved (0)

Reserved (0)

QErr (0)

DQue (0)

SWP (0) RAERP(0) UAAERP(0) EAERP(0)

Autoload Mode

(MSB)

Ready AER Hold-off Period (0)

(LSB)

Busy Timeout Period (0)

Extended Self-Test Completion Timeout (0)

Control mode page fields:

Autoload Mode

If a cartridge is inserted, the drive pulls it in and threads the tape.

1 or When a cartridge is inserted, the drive pulls it in but does not thread the tape. In

this position, only the Cartridge Memory is accessible.

All other values are invalid.

Data Compression Characteristics page

The Data Compression Characteristics Mode page is defined as follows:

Page Code {0Fh}

Page Length {0Eh}

DCE [1]

DDE (1)

(MSB)

DCC (1)

RED (0)

Reserved (0)

Compression Algorithm (1)

(LSB)

(MSB)

Decompression Algorithm (1)

Reserved (0)

MODE SELECT 15h/ 55h 79

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Data Compression Characteristics mode page fields:

DCE

Data Compression Enable. This bit controls whether the drive uses compression when

writing. The value has no meaning when reading, that is, if the tape contains

compressed data, decompression will occur regardless of the setting of this bit.

The bit is analogous to the Select Data Compression Algorithm field on the Device

Configuration mode page (see page 81).

Compression is disabled

Compression is enabled

DCC

DDE

RED

Data Compression Capable

Read only. It will have the value of 1, indicating that compression is supported.

Data Decompression Enable

Read only. It will have the value of 1, indicating that compression is enabled.

Report Exception on Decompression

Read only. It will have the value 0, meaning that the drive returns CHECK CONDITION

status when it encounters data that cannot be decompressed. This applies when data

has been compressed with an unknown or unsupported compression algorithm.

Compression

Algorithm

This indicates which compression algorithm will be used to process data from the host

when the DCE bit is set to one. If the host selects an algorithm which the drive does not

support, CHECK CONDITION is returned, with a sense key of ILLEGAL REQUEST. Only

the default algorithm (ID 1) is supported.

Decompression This will also always be 1, indicating that the default decompression algorithm should

Algorithm

be used.

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Device Configuration page

The drive supports the Device Configuration page, which has the following format:

PS (0)

Rsvd (0)

Page Code {10h}

Additional Page Length {0Eh}

Obsolete CAF (0) Active Format (0)

Rsvd(0)

Active Partition (0)

Write Buffer Full Ratio (0)

Read Buffer Empty Ratio (0)

(MSB)

Write Delay Time: 012Ch

(LSB)

DBR (0)

BIS (1)

RSmk(0) AVC (0)

SOCF (00)

RBO(0) REW (0)

Gap Size (0)

EOD Defined (000)

EEG (1) SEW (1)

Reserved (0)

(MSB)

Buffer Size at Early Warning (0)

(LSB)

Select Data Compression Algorithm [1]

ASOCW PERSWP PRMWP

P (0) (0) (0)

Reserved

(0)

WTRE

OIR

Rewind on Reset [0]

Pre-execution checks:

The only check made when this page is sent in Mode Select data is Parameter List.

Changeable parameters:

Write Delay This field can be modified by a MODE SELECT command, and this change will be

Time

reflected in a subsequent MODE SENSE command. However the actual value used as the

delay time will remain as zero, and so the data in the buffer will never be flushed. The

default value is zero.

The drive will never flush buffered data to tape as a result of a time-out.

>0 The time in 100 ms increments that the drive should wait with unwritten data in the

buffer and no activity on the interface before forcing data to tape. The delay is

timed from the completion of the preceding Write or Write Filemarks command.

Select Data

Compression

Algorithm

Use Scheme 2 of the LTO-DC algorithm (pass-through mode). Note that clearing

this parameter is not advised.

Use the default compression scheme. This is the default.

MODE SELECT 15h/ 55h 81

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WTRE

WORM Tamper Read Enable. Controls the behavior of the drive when reading WORM

media if it appears that the integrity of the tape has been compromised by tampering.

W TRE has no effect on reads of normal (non-WORM) media.

Default: If no tampering has been detected, data is returned as normal.

If tampering has been detected, no data is returned in response to a READ

command or after the position of tamper. CHECK CONDITION is returned with

sense key of Medium Error and additional sense of 300Dh (WORM medium—

integrity check failed). TapeAlert flag 3Bh (medium error—integrity check failed)

is set. The Error Code field in the Error Usage page will be filled with the ASC/ Q

of 300Dh.

Data is returned regardless of whether tampering has been detected on the

WORM cartridge. The bit should only be set as a last resort where data recovery

overrides concerns about WORM integrity.

Rewind on

Reset

00b A Logical Unit Reset does not alter the logical position.

01b A Logical Unit Reset will cause the tape to be rewound to BOT.

10b A Logical Unit Reset does not alter the logical position.

11b Reserved

Unchangeable parameters:

CAF

The Change Active Format flag should be zero since changing formats is not

supported.

Active Format

Active Partition

Changing formats is not supported.

Multiple partitions are not supported.

Buffer management is done by the drive.

Write Buffer Full

Ratio

Read Buffer

Empty Ratio

Buffer management is done by the drive.

DBR

BIS

The Data Buffer Recovery flag should be clear since this feature is not supported.

The Block Identifiers Supported flag should be set since block identifiers are

supported.

Rsmk

AVC

The Report Set Marks flag should be clear since this feature is not supported.

The Automatic Velocity Control flag should be clear since velocity control is

managed by the drive.

SOCF

The Stop On Consecutive Filemarks flag should be clear since this feature is not

supported.

RBO

REW

The Recover Buffer Order flag should be clear since this feature is not supported.

The Report Early Warning on read flag should be clear since this feature is not

supported.

Gap Size

There is no concept of inter-block gaps in the format.

EOC Defined

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EEG

The Enable EOD Generation flag should be set since EOD generation is always

enabled.

SEW

The Synchronize at Early Warning flag should be set since this feature is

supported.

Buffer Size at

Early Warning

The Buffer Size at Early Warning field should be zero as this cannot be set.

Medium Partitions mode page

The Medium Partitions mode page has the following format. Note that none of the fields are

changeable. The Partition Size will be patronized.

Page Code (11h)

Page Length (08h)

Maximum Additional Partitions (0)

Additional Partitions Defined (0)

FDP (0) SDP (0) IDP (0)

Medium Format Recognition (3)

Reserved (0) Partition Units (9)

PSUM (11b)

POFM (0) CLEAR (0) ADDP (0)

Reserved (0)

(MSB)

Partition Size

(LSB)

None of the fields in this mode page are changeable.

Maximum Additional

Partitions

Zero is returned, indicating that no additional partitions are present or

supported.

Additional Partitions

Defined

Zero must be returned, indicating that no additional partitions are present

or supported.

FDP

The Fixed Data Partitions bit is not supported and must be set to zero.

The Select Data Partitions bit is not supported and must be set to zero.

The Initiator Defined Partitions bit is not supported and must be set to zero.

SDP

IDP

POFM

The Partitions on Format bit is set to zero since the drive does not support

the FORMAT MEDIUM command through which the tape could be

partitioned.

CLEAR

ADDP

Set to zero indicating SCSI-2 compatibility.

Medium Format

recognition

This indicates that the drive is capable of format and partition recognition.

MODE SELECT 15h/ 55h 83

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PSUM

Partition Size Unit of Measure: The value of 11b indicates that the units of

measure for the Partition Size descriptor are defined by the Partitions Units

(Partition Units)

field: 10

bytes.

Partition Units

Partition Size

This defines the units of the Partition Size field as 10 bytes, in other words

in gigabytes.

The Partition Size field will be updated following successful execution of the Set

Capacity command.

100 Gen 1 tape loaded

200 Gen 2 tape loaded

400 Default value. No data cartridge present or Gen 3 tape loaded.

Fibre Channel Logical Unit Control mode page

This page is supported for Fibre Channel only:

PS (0)

Rsvd (0)

Page Code {18h}

Page Length {06h)

Reserved (0)

EPDC[1]

4–7

Reserved (0)

EPDC

The target does not use the precise delivery function and ignores the contents of the CRN

field in the Fibre Channel Extended Link Service FCP_CNTL. HP Ultrium drives support

this feature by default.

The logical unit uses the precise delivery function defined in the FCP-2 standard. It makes

use of the CRN field.

SCSI LUN Control mode page

NOTE: This page is supported for SCSI drives only, from Gen 3 onwards.

PS (0)

Rsvd (0)

Page Code {18h}

Page Length {06h)

Reserved (0)

Protocol Identifier (1h)

3–7

Reserved (0)

Protocol Identifier

The protocol to which this mode page applies is SPI SCSI.

Commands

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Fibre Channel Port Control mode page

NOTE: This page is supported for Fibre Channel only.

The Fibre Channel Port Control page allows you to set the initialization and addressing behavior of

the Fibre Channel interface.

PS (0)

Rsvd (0)

Page Code {19h}

Page Length {06h)

Reserved (0)

PLPB(0) DDIS(0) DLM(1)

Protocol Identifier (FCP=0)

DTFD (0)

RHA(0) ALWLI(0) DTIPE(0) DTOLI(0)

Reserved (0)

RR_TOV Units (3)

Resource Recovery Time-Out Value—RR_TOV (F0h, that is, 24s)

DTFD

Disable Target Fabric Discovery. If the drive is not attached to an arbitrated loop, the

DTFD bit is ignored.

When attached by an arbitrated loop, the drive will discover a fabric loop port if

one is present on the loop and perform public loop functions.

When attached by an arbitrated loop, the drive will not recognize the presence of

a fabric loop port on the loop. The drive performs only the private loop functions.

PLPB

Prevent Loop Port Bypass

The drive allows the Loop Port Bypass (LPB) and Loop Port Enable (PBE) primitive

sequences to control the port bypass circuit.

The drive ignores any Loop Port Bypass (LPB) and Loop Port Enable (LPE) primitive

sequences. The loop port remains enabled. When the PLPB bit is zero, the drive

allows the LPB and PBE primitive sequences to control the port bypass circuit.

NOTE: If the PLPB bit is set to 1, the DTIPE bit must be set to 0.

DDIS

DLM

Disable Discovery

The drive must wait to receive an Address Discovery Link Service (ADISC) or Port

Discovery Link Service (PDISC) before it resumes processing tasks for the initiator.

The drive does not require receipt of Address or Port Discovery following loop

initialization. The drive resumes processing of tasks on completion of loop

initialization.

Disable Loop Master.

The drive may become loop master during the loop initialization process.

The drive will never attempt to be a loop master; it only repeats LISM frames it

receives. This allows the initiator to be loop master during loop initialization.

MODE SELECT 15h/ 55h 85

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RHA

Require Hard Address. If the drive is not attached to an arbitrated loop, the RHA bit is

ignored.

The drive follows the normal initialization procedure, including the possibility of

obtaining a soft address during the loop initialization process.

When attached to an arbitrated loop, the drive will only attempt to obtain its hard

address (available via the device address jumpers) during loop initialization. The

drive will not attempt to obtain an address during the LISA phase of initialization.

If there is a conflict for the hard address selection during loop initialization or it

does not have a valid hard address available, the drive will enter the non-

participating state. If the drive detects loop initialization while in the non-

participating state, it will again attempt to get its hard address. If the hard address

has not changed from the address obtained in a previous successful loop

initialization, the drive will attempt to obtain the address in the LIFA phase if a

valid Fabric Login exists or in the LIPA phase of loop initialization. If the hard

address has changed, the target will attempt to obtain the new address in the

LIHA phase.

ALWLI

DTIPE

Allow Login Without Loop Initialization

The drive is required to verify its address through the loop initialization process

before a login is accepted.

The drive uses the hard address available in the SCA connector or device address

jumpers and accepts logins without verifying the address with loop initialization.

Disable Target Initiated Port Enable

The drive enables its port into the loop without waiting for a Loop Port Enable

primitive.

The drive waits for an initiator to send the Loop Port Enable primitive before

inserting itself into the loop. The drive uses the hard address available in the SCA

connector or device address jumpers to determine if primitives are addressed to it.

A Loop Port Enable primitive with the broadcast address will also cause the drive

to insert itself into the loop.

NOTE: If the DTIPE bit is set to 1, the PLPB bit must be set to 0.

DTOLI

Disable Target Originated Loop Initialization

The drive generates the Initializing LIP after it enables a port into a loop.

The drive does not generate the Initializing LIP following insertion into a loop. It

will respond to an Initializing LIP when it is received. It will generate the Loop

Failure LIP at its input and the Initializing LIP when the loop failure is corrected.

RR_TOV Units

Resource Recovery Time-Out Value Unit. The field specifies the unit of measure as

follows:

000b No timer specified

001b 0.001s

011b 0.1s, units used by HP Ultrium drives

101b 10s

RR_TOV

The number of time units specified by the RR_TOV Units field that are used by the timer

that performs the RR_TOV time-out functions.

F0h 240 x 0.1s units = 24 seconds

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SCSI Port Control Mode page

NOTE: This page is supported for SCSI drives only, from Gen 3 onwards.

Normal page

If the Port Control mode page (19h) is requested via the MODE SENSE command with the Sub-

Page code set to zero, the following data will be returned:

PS (0)

SPF(0)

Page Code {19h}

Page Length {06h)

Reserved (0)

Protocol Identifier (1h)

Reserved (0)

Synchronous Transfer Timeout (0)

Reserved (0)

6–7

Protocol Identifier

Synchronous Transfer Timeout

The protocol to which this mode page applies is SPI SCSI.

Synchronous Transfer Timeout is disabled.

Sub-pages

PS (0)

SPF(0)

Page Code {19h}

Subpage Code

Page Length (n-3)

Reserved (0)

Protocol Identifier (01h)

Protocol Specific Mode Parameters

The following sub-pages are supported:

•

Margin Control (01h) — static data

Saved Training Configuration Values (02h) — static data

Negotiated Settings (03h) — dynamic data

Report Transfer Capabilities (04h) — static data

MODE SELECT 15h/ 55h 87

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Sub-page 01h—Margin Control

Reserved (0)

Driver Strength (0)

Driver Asymmetry (0)

Driver Slew Rate (0)

Reserved (0)

Drive Precompensation (1h)

Reserved (0)

Vendor Specific (0)

Reserved (0)

None of the fields are supported on this page, so they should all be zero.

Sub-page 02h—Saved Training Configuration Values

Reserved (0)

DB(0) Value (0)

DB(15) Value (0)

P_CRCA Value (0)

P1 Value (0)

BSY Value (0)

SEL Value (0)

RST Value (0)

REQ Value (0)

ACK Value (0)

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ATN Value (0)

C/ D Value (0)

I/ O Value (0)

MSG Value (0)

Reserved (0)

100

103

104

107

108

111

112

227

All the fields on this page are vendor-specific. None are supported, so they should all be zero.

Sub-page 03h—Negotiated Settings

Transfer Period Factor

Reserved (0)

Req/ Ack Offset

Transfer Width Exponent

Protocol Options Bits

Sent

Received

Reserved (0)

Transceiver Mode

PCOMP_EN PCOMP_EN

Reserved (0)

Transfer Period Factor

Req/ Ack Offset

The negotiated transfer period factor.

The negotiated Req/ Ack offset.

Transfer Width Exponent The negotiated transfer width.

Protocol Options Bits

The negotiated protocol options:

Bit Protocol Option Meaning

Supported

PCOMP_EN

RTI

Precompensation

Yes

Retain training information

Read streaming and read flow control

Write flow control

RD_STRM

WR_FLOW

HOLD_MCS

QAS_REQ

DT_REQ

Hold margin control

Quick arbitration and selection

Double transition clocking

Information units

IU_REQ

MODE SELECT 15h/ 55h 89

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Transceiver Mode

The current bus mode:

Code

00b

01b

10b

11b

Bus Mode

Unknown

LVD

HVD (Note that this will never be reported since the drive will

not operate on an HVD bus)

Sent PCOMP_EN

The value of the PCOMP_EN bit sent. This will be set if PCOMP_EN has

been negotiated successfully.

Received PCOMP_EN

The value of the PCOMP_EN bit received. This will be set if PCOMP_EN has

been negotiated successfully.

Sub-page 04h—Report Transfer Capabilities

Minimum Transfer Period Factor (08h)

Reserved (0)

Maximum Req-Ack Offset (40h)

Maximum transfer Width Exponent (1)

Protocol Option Bits Supported (C3h)

Reserved (0)

Minimum Transfer Period Factor 08h The smallest value of the transfer period factor supported. For

Gen 3 SCSI, this is 8, in other words, FAST160.

Maximum Req/ Ack Offset

40h The maximum value for the Req/ Ack offset. For Gen 3 SCSI, this

is 64 (40h).

Maximum Transfer Width

Exponent

The maximum width supported. For Gen 3 SCSI, this is 1.

Protocol Option Bits Supported C3h. The protocol options supported. The value of C3h indicates that

PCOMP_EN, RTI, DT_REQ and IU_REQ are supported and

RD_STRM, WR_FLOW, HOLD_MCS and QAS_REQ are not.

See the Protocol Options Bits field on sub-page 03h (Negotiated

Settings) on page 89 for details of the bits.

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Information Exceptions mode page

The Information Exceptions Mode page is used to control exception reporting through the

“TapeAlert log page” on page 65:

PS (0)

Rsvd (0)

Page Code {1Ch}

Page Length {0Ah)

DExcpt

Perf (0)

(MSB)

Reserved (0)

Test

Rsvd (0) LogErr (0)

Reserved (0)

MRIE (3h)

Interval Timer (0)

(LSB)

Report Count/ Test Flag Number

Perf

Informational exception operations that cause delays are acceptable.

DExcpt

Disable Exception Control. It must be zero when the Test Flag Number is zero. When

the Test Flag Number contains a valid non-zero value, the DExcpt flag can be 0 or 1.

Information exception operations are enabled. The reporting of information

exception conditions is determined from the MRIE field.

A DExcpt bit of one indicates the target will disable all information exception

operations. The method of reporting informational exceptions field is ignored

when DExcpt is set to one. The Test bit must not be set at the same time.

Test

If the Test flag is clear the next command will be processed normally.

A test bit of one will generate false informational exception conditions. As a

result, the next SCSI command after the Mode Select will return CHECK

CONDITION with a sense key of RECOVERED ERROR and additional sense of

5DFFh (failure prediction threshold exceeded - false). The DExcpt bit must not be

set at the same time.

The Test bit will never be read as 1 when performing a Mode Sense command. This

is not an indication that the drive is in test mode.

For example, using the Test bit and Test Flag Number, it may be possible to set a flag

with the DExcpt bit set to 1. When the DExcpt bit is next set, the drive will report

CHECK CONDITION with a sense key of RECOVERED ERROR and additional sense

of 5DFFh (failure prediction threshold exceeded - false). In order to set the DExcpt bit

again, note that the Test bit must still be set during the Mode Select command.

LogErr

Log Errors bit. This bit must be zero, indicating that the logging of informational

exception conditions within the drive is vendor-specific.

MODE SELECT 15h/ 55h 91

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MRIE

Method of Reporting Informational Exceptions

3h This field indicates the method used by the target to report informational

exception conditions and must be set to 3. The target will report informational

exception conditions by returning a CHECK CONDITION status on any

command. The sense key will be set to RECOVERED ERROR with additional

sense of 5D00h (failure prediction threshold exceeded). The command that has

the CHECK CONDITION will complete without error before any informational

exception condition may be reported.

Interval Timer

Must be zero, indicating that the drive only reports an informational exception

condition once.

Report Count/ Test

Flag Number

If the Test bit is zero, this field is the Report Count and must be zero, indicating

that there is no limit on the number of times the drive can report an informational

exception condition.

If the Test bit is one, this field is the Test Flag Number, that is, the number of a

supported TapeAlert flag. The target will generate a test informational exception

condition. As a result, the next SCSI command after Mode Select will return

CHECK CONDITION with a sense key of RECOVERED ERROR and additional

sense of 5DFFh (failure prediction threshold exceeded - false).

The following are valid settings:

1 through 64

This sets the TapeAlert flag with this number in the

Log page.

−1 through −64

This clears the TapeAlert flag indicated by the

absolute value of the Test Flag Number.

(FFFFFFFFh–FFFFFFC0h)

32767 (7FFFFh)

This sets all the TapeAlert flags supported by the

target in the Log page.

Note that if an attempt is made to set or clear a flag that is not supported by the drive, CHECK

CONDITION will be reported with a sense key of ILLEGAL REQUEST and additional sense of 2600h

(invalid field in parameter list).

Device Time mode page

The Device Time Mode page consists of the following page header followed by three Timebase

descriptors:

PS (0)

SBF (0)

Page Code (3Ch)

Page Length (1Ah)

Reserved (0)

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Power-on time descriptor

Timebase Identifier (00h)

Timebase Field Length (06h)

(MSB)

Current Power-on Count

Power-on Time

(LSB)

World time descriptor

Timebase Identifier (01h)

Timebase Field Length (06h)

Reserved (0)

UTC

NTP

(LSB)

(MSB)

World Time

Library time descriptor

Timebase Identifier (10h)

Timebase Field Length (06h)

Reserved (0)

Library Time (hrs)

Library Time (mins)

Library Time (secs)

Reserved 0)

MODE SENSE

MODE SELECT

Power-on Time is invalid.

Power-on Time is valid.

World Time is invalid.

World Time is valid.

Library Time is invalid.

Library Time is valid.

Ignored

1 to set world time

Ignored

MODE SELECT 15h/ 55h 93

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MODE SENSE

MODE SELECT

Current Power-on The number of times the drive has been Ignored

Count

powered on

Power-on Time

The number of seconds since the drive

has been powered on

Ignored

World Time

UTC

The number of seconds from 00:00:00 Ignored if W T = 0

on January 1, 1970

The local timezone has been used. Ignored if W T is 0

Set to 1 if UTC World Time is being used.

1h World Time is UTC.

Unsure if NTP-synced

NTP

Ignored if W T is 0

Set to 1 if World Time is NTP-synced.

1h World Time is set from NTP source.

Library Time

The time in hrs:mins:secs set by the

library controller

Ignored

CD-ROM Emulation/ Disaster Recovery mode page

This page can be used irrespective of whether the drive is acting as a tape or a CD device.

Page Code {3Eh}

Page Length {02h}

Reserved (0)

Non-Auto CDmode

CD-ROM Emulation/ Disaster Recovery mode page fields:

Non-Auto

When a system restarts after booting off tape, the drive detects the SCSI resets issued

during reboot and, in conjunction with knowing that more than 100 blocks have been

read in CD-ROM emulation mode, will revert back to behaving as a tape device. This is

the standard method by which the drive automatically reverts to being a tape drive in

order that a backup application can do file system recovery. The method of reversion

involves a firmware reboot, so the drive might become unavailable for a few seconds

during its “power-on” following the SCSI reset. (Note that normal SCSI reset response does

not involve a firmware reboot).

Setting this flag to 1 inhibits this automatic return to tape drive behavior; the drive will

remain in CD-ROM mode irrespective of blocks read and SCSI resets.

CDmode

MODE SENSE

The drive is in tape drive mode.

The drive is in CD-ROM emulation mode.

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MODE SELECT This flag can be used to switch the drive between normal operation and

CD-ROM emulation mode:

•

If this bit is set to its existing value, there is no change.

If this bit is changed from 0 to 1, the drive will enter CD-emulation

mode. It will change its Inquiry and Mode data appropriately and

cache the first 250 KB of the CD image off tape. CD-ROM support

commands will be enabled. This transition is primarily present to

support automated functional testing.If the bit is changed from 1 to

0, the drive leaves CD-ROM emulation mode and reverts to normal

tape drive mode.

•

If this bit is changed from 1 to 0, the drive will leave CD-emulation

mode. The Inquiry and Mode data will revert to that for a tape drive

and CD-ROM command support will stop. The tape will be reloaded

and the logical position will be BOP. Backup applications can use

this transition to switch to a normal mode of operation for file system

recovery off tape. Note that operating systems that pre-load class

drivers at boot might not be prepared to talk to the erstwhile CD-

ROM drive

MODE SELECT 15h/ 55h 95

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MODE SENSE

1Ah/ 5Ah

MODE SENSE allows the drive to return its current configuration and report which configuration

parameters can be changed through M O D E SE L ECT.

The mode sense header, block descriptor (optional), and zero or more of the are sent to the host.

Mode pages contain drive configuration parameters. Some of these parameters are fixed, others

are configurable (through the MODE SELECT command). The host should use MODE SENSE to

determine which drive parameters are configurable and what their current values are before using

mode select to alter them.

NOTE: See MODE SELECT on page 71 for full descriptions of the Mode Parameters.If a MODE

SENSE command is issued whilst an immediate reported Load command is executing or close

to completing then the values of some parameters in some mode pages which depend on the

results of the load may be undefined.

Similarly, the write-protect field in the Mode Parameter Header will be unstable unless a

cartridge is present and medium removal is prevented.

Pre-execution checks:

Illegal Field

Reservation

Deferred Error

Unit Attention

The page code field must contain a valid mode page code or the value 0 or the value 3Fh. If it

does not then CHECK CONDITION status is reported. Sense data will be as described in the Illegal

Field Checks.

Command descriptor block:

6-Byte Version

Operation Code (1Ah)

DBD

Reserved (0)

Page Code

Sub Page Code

Allocation Length

Control

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10-byte version

Operation Code (5Ah)

DBD

Reserved (0)

Page Code

Sub Page Code

Reserved (0)

(MSB)

Allocation Length

Control

(LSB)

CDB fields:

DBD

Disable Block Descriptors flag

Allows the drive to return the MO DE SELECT block descriptor.

Prevents the drive from returning the MODE SELECT block descriptor.

Page Control—Indicates the type of page parameter values to be returned to the host, as

shown in the following table:

Description

Report Current Values: the current values of the parameters are returned.

Report Changeable Values: the page returned has its non-changeable

parameter fields cleared to 0. The fields that are changeable are set to all

1’s.

0/ 1 Report Default Values: the page returned contains the power-on/ reset/ bus-

device-reset values of the mode parameters.

Page Code

This allows the host to select any specific page, or all the pages supported by the drive.

The drive returns no mode pages, so only the header and block descriptor

are returned.

Any mode The drive returns that page.

page code

3Fh

The drive returns all mode pages.

Sub Page

Code

The sub-page code of the page code for data to be returned. If there are no sub-pages, it

should be set to 0.

Allocation

Length

Specifies the number of bytes that the host has allocated for returned MODE SENSE data.

No data transfer will occur. This is not considered an error.

The maximum number of bytes which the drive should return in its data -out phase.

Either the entire mode page or allocation length bytes of the page are returned,

whichever is least.

MODE SENSE 1Ah/ 5Ah 97

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PERSISTENT RESERVE IN

5Eh

PERSISTENT RESERVE IN is used to obtain information about persistent reservations and reservation keys that

are active within a tape drive logical unit.

Pre-execution checks:

Illegal Field

Reservation

Deferred Error

Unit Attention

Command descriptor block:

Operation Code (5Eh)

Reserved (0)

Service Action

Reserved (0)

(MSB)

Allocation Length

Control

(LSB)

CDB fields:

Service Action The service action types that are supported are:

00h Read Keys Returns all registered reservation keys

01h Read Reservation Returns information on any current persistent reservation

02h Read Capabilities Returns details of the persistent reservation features supported

Allocation

Length

The maximum amount of data (in bytes) that should be returned to the host. The drive will

return all of the requested information or allocation length bytes, whichever is least.

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Returned data for service actions:

Read Keys service action

The drive will return a parameter list containing an 8-byte header and list of each currently

registered I_T nexus’ reservation key. Each key is 8 bytes long. The format of the returned data is

as follows:

(MSB)

PR Generation

(LSB)

Additional Length (n-7)

First Reservation Key

n-7

Last Reservation Key

PR Generation A 32-bit counter that is maintained by the drive and incremented every time a

PERSISTENT RESERVE OUT command requests a Register, Register and Ignore Existing

Key, Clear, Preempt, or Preempt and Abort service action.

Read Reservation service action

The drive returns a parameter list containing an 8-byte header and the persistent reservation, if

any, that is present in the drive. If no persistent reservation is present, Additional Length is 0 and

no reservation data is returned. If a persistent reservation is present, Additional Length is 10h and

16 bytes of reservation data are returned as follows:

(MSB)

PR Generation

Additional Length (0 or10h)

Reservation Key

(LSB)

Obsolete (0)

Reserved (0)

Scope (0)

Type

Obsolete (0)

PERSISTENT RESERVE IN 5Eh 99

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PR Generation

As for “Read Keys service action” on page 99.

Reservation Key The key under which the persistent reservation is held.

Scope

Type

Indicates LU_SCOPE.

The characteristics of the persistent reservation currently held. Persistent reservation

types supported by the drive are:

3h Exclusive access

6h Exclusive access, registrants only

8h Exclusive access, all registrants

See PERSISTENT RESERVE OUT for more information and also the appropriate

standards.

Read Capabilities service action

This provides a mechanism for the drive to report which features of Persistent Reservation are

implemented. The format of the data returned is as follows:

(MSB)

Length (0008h)

(LSB)

PTPL_C(1)

PTPL_A

Reserved (0)

CRH (1) SIP_C (1) ATP_C(0) Rsvd(0)

Reserved (0)

TMV (1)

WR_EX_AR(0) EX_AC_RO(1) WR_EX_RO(0) Rsvd(0) EX_AC(1) Rsvd(0) WE_EXC(0)

Reserved (0)

Rsvd(0)

EX_AC_AR(1)

Reserved (0)

PTPL_A

Persist Through Power Loss has not been activated

The most recent successfully completed PERSISTENT RESERVE OUT command

with Register or Register and Ignore Existing Key service action had the APTPL

bit set to one in the parameter data.

All the other fields are fixed. Refer to the description of PERSISTENT RESERVE OUT or the appropriate

standards for more information.

the PERSISTENT RESERVE IN command, and clause 5.6 for a detailed discussion of reservations.

100 Commands

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PERSISTENT RESERVE OUT

5Fh

PERSISTENT RESERVE OUT is used to request service actions that create a persistent reservation in a

logical unit within the tape drive for the exclusive or shared use of a particular I_T nexus. The

command uses other service actions to manage and remove such persistent reservations.

An I_T nexus performing Persistent Reserve Out service actions is identified by a reservation key.

Pre-execution checks:

Illegal Field

Reservation

Deferred Error

Unit Attention

Command descriptor block:

Operation Code (5Fh)

Reserved (0)

Service Action

Type

Scope

Reserved (0)

Parameter List Length

Control

CDB fields:

Service Action 00b Register

Registers or unregisters a reservation key with the device

server.

01b Reserve

02b Release

03h Clear

Creates the persistent reservation.

Releases the persistent reservation.

Clears all reservation keys and the persistent reservation.

04h Preempt

Pre-empts the persistent reservation and/ or remove

registrations.

05h Preempt and Abort Pre-empts the persistent reservation and/ or remove

registrations, and aborts all tasks for all pre-empted I_T

nexuses.

06h Register and

Registers or unregisters a reservation key with the device

Ignore Existing Key server.

Scope

Indicates LU_SCOPE.

PERSISTENT RESERVE OUT 5Fh 101

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Type

The characteristics of the persistent reservation currently held. Persistent reservation types

supported by the drive are:

3h Exclusive access

6h Exclusive access, registrants only

8h Exclusive access, all registrants

Parameter List The amount of data (in bytes) that should be sent to the drive from the host in parameter

Length

list data.

If the SPEC_I_PT bit in the parameter data is 0, this field is set to 18h.

If SPEC_I_PT is 1, this field specifies the number of bytes of parameter data (minimum is

18h).

Parameter data

(MSB)

Reservation Key

Service Action Reservation Key

Obsolete (0)

(LSB)

Reserved (0)

SPEC_1_PT ALL_TG_PT Rsvd(0) APTPL

Reserved (0)

Obsolete (0)

(MSB)

Additional Parameter Data

(LSB)

Reservation Key Identifies the I_T nexus that sent the command. The value must match the registered

reservation key for the I_T nexus except for:

•

The Register and Ignore Existing Key service action, where this field is

ignored.

The Register service action for an unregistered I_T nexus, where this field

is 0.

If the Reservation Key does not match with the one registered in the device server for

the I_T nexus, the device server returns Reservation Conflict.

Service Action

Information needed for the following service actions: Register, Register and Ignore

Reservation Key Existing Key, Preempt, and Preempt and Abort.

For the Register and Register and Ignore Existing Key service actions:

Unregisters the registered reservation key specified in the Reservation Key field.

The new reservation key to replace the existing one as specified in the

Reservation Key field for the I_T nexus.

102 Commands

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For the Preempt and Preempt and Abort service actions, this field contains:

The reservation key of registrations to be removed

if this field also identifies a persistent reservation holder, the persistent

reservation to be pre-empted.

SPEC_I_PT

Valid only for the Register and Register and Ignore Existing Key service actions.

The Additional Parameter Data is ignored and the registration is applied only to

the I_T nexus that sent the command.

The Additional Parameter Data includes a list of transport IDs and the device

server applies the registration to the I_T nexus for every initiator port specified

in the transport list.

ALL_TG_PT

APTPL

Not supported and ignored.

Only valid for the Register and Register and Ignore Existing Key service actions.

This is a summary of the field validity in the parameter data:

Service Actions

Reservation Key

Service Action

Scope

Type

Reservation Key

valid

APTPL SPEC_I_PT

ignored ignored

valid

Existing Key

ignored

valid

Reserve

LU_SCOPE valid

ignored ignored

LU_SCOPE valid

valid

ignored

valid

ignored ignored

Release

Clear

Preempt

Preempt and Abort

valid

Additional parameter data

(MSB)

Transport Parameter Data Length (n-27)

(LSB)

Transport IDs List

First Transport ID

(MSB)

(LSB)

Last Transport ID

Transport Parameter Specifies the number of bytes of Transport IDs to follow. The Parameter List Length

Data Length

in the CDB contains all the bytes specified in Transport Parameter Data Length.

PERSISTENT RESERVE OUT 5Fh 103

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Fibre Channel Transport ID

(LSB)

Format Code (00b)

Reserved (0)

Protocol Identifier (0)

Reserved (0)

(MSB)

World Wide Name

Reserved (0)

Parallel SCSI Transport ID

Format Code (00b)

Reserved (0)

Protocol Identifier (1h)

(MSB)

SCSI Address

Relative Port Identifier (0)

Reserved (0)

(LSB)

(MSB)

104 Commands

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PREVENT/ ALLOW MEDIUM REMOVAL

1Eh

PREVENT/ ALLOW MEDIUM REMOVAL tells the drive to enable or disable the removal of the

cartridge.

When cartridge removal is prevented, the front panel eject button is completely disabled (though a

‘forced eject’ will still work). An Unload command issued by a host will result in CHECK

CONDITION. The sense key will be ILLEGAL REQUEST or MEDIUM REMOVAL PREVENTED.

When cartridge removal is enabled, pressing the front panel eject button or sending an Unload

command from a host will cause the media to be unloaded and ejected.

Removal prevention is on a per-host basis. All the hosts have to allow media removal for any of

them to do so.

NOTE: If a firmware upgrade is initiated over any interface, the cartridge will be ejected from

the drive regardless of the state of this command.

Pre-execution checks:

Illegal Field

Reservation

Deferred Error

Unit Attention

Command descriptor block:

1–3

Operation Code (1Eh)

Reserved (0)

Prevent

Control

CDB fields:

Prevent

00b

01b

Medium removal is allowed for the drive

Media removal is prohibited for the drive

10b, 11b Invalid

PREVENT/ ALLOW MEDIUM REMOVAL 1Eh 105

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READ

08h

READ transfers zero or more data blocks to the host starting at the current logical position.

Pre-execution checks:

Illegal Field

Fixed Bit

Reservation

Deferred Error

Unit Attention

Media Access

Diagnostic Status

If both the SILI and Fixed bits are set, CHECK CONDITION status is reported. Sense data is as

described in the Illegal Field Checks. The field pointers indicate the Fixed bit field.

NOTE: Transfers of 4 bytes or less are not supported.

Command descriptor block:

Operation Code (08h)

Reserved(0)

SILI

Fixed

(LSB)

(MSB)

Transfer Length

Control

CDB fields:

If the Fixed flag is clear and Transfer Length is not zero, then a single block of the length in

Transfer Length is to be transferred. If the next block on tape is of this length or shorter it is

transferred to the initiator. If the next block is longer than this length, only the length requested is

returned and the logical position is set to after the record. If the length of the block was the same

as the Transfer Length field, GOOD status is returned. If the length of the block was not the same as

in Transfer Length and the Suppress Illegal Length Indicator (SILI) flag was clear, Check Condition

status is returned, ILI will be reported as described below. If the length of the block was not the

same as in Transfer Length and the Suppress Illegal Length Indicator (SILI) flag was set, Good status

is returned.

If the fixed flag is set and the Transfer Length field is not zero and the Suppress Illegal Length

Indicator (SILI) flag is clear, a sequence of blocks of the currently configured block length is to be

returned, the number of blocks being indicated in the Transfer Length field. If there is a sequence

of blocks of this length on the tape, they are returned to the initiator with GOOD status. If a block

that is longer than the configured length is encountered before the sequence is complete, the

blocks up to that block are returned followed by the configured length from the record that was too

long and Check Condition status (ILI will be reported as described below). If a block that is shorter

than the configured length is encountered before the sequence is complete, the blocks up to that

block are returned followed by all of that block and Check Condition status (ILI will be reported as

106 Commands

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described below). The current position is set after the last block that was returned or partially

returned

SILI

Suppress Incorrect Length Indicator

The read operation is terminated when the length of a block (on the tape) differs from the

Transfer Length. Transfer Length bytes of data will have been transferred. The logical tape

position will be the EOM side of the illegal sized block.

The drive will not report CHECK CONDITIO N status if the only error is that the Transfer

Length is not equal to the actual block length recorded on the media.

Fixed

The Transfer Length field specifies the length of the transfer in bytes.

A single block of the length in Transfer Length is to be transferred.

•

If the next block on tape is of Transfer Length, it is transferred to the initiator

and GOOD status is returned.

•

If the next block on tape is not of Transfer Length:

If it is shorter, the whole block is transferred to the initiator.

If it is longer, only the length requested is returned and the logical position is

set to after the record.

•

If SILI = 0, CHECK CONDITION status is returned. ILI is reported as described

below.

If SILI = 1, GOOD status is returned.

The Transfer Length field specifies the length of the transfer in blocks. The size of each

block (in bytes) is specified by the current block length specified in the Mode Parameter

block descriptor.

If SILI = 0, a sequence of blocks of the currently configured block length is to be returned,

the number of blocks being indicated in the Transfer Length field.

•

If there is a sequence of blocks of this length on the tape, they are returned to

the initiator with GOOD status.

•

If a block that is shorter than the configured length is encountered before the

sequence is complete, the blocks up to that block are returned followed by all

of that block and CHECK CONDITION status (ILI will be reported as described

below). The current position is set after the last block that was returned.

•

If a block that is longer than the configured length is encountered before the

sequence is complete, the blocks up to that block are returned followed by the

configured length from the record that was too long and CHECK CONDITION

status (ILI will be reported as described below). The current position is set

after the last block that was partially returned.

Transfer

Length

No data is transferred. This is not considered an error and the current logical position will

be unchanged.

>0 The amount of data to be transferred, in bytes or blocks as specified by the Fixed field.

NOTE: Transfers of 4 bytes or less are not supported.

READ 08h 107

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Read specific status:

Event

Status

Key

Notes

SILI error

CHECK

COND’N SENSE

ILI and Valid bits are set. The information bytes will be set

as follows:

Variable Block Mode: The difference between the

requested Transfer Length and the actual block size. If the

block size is bigger than the Transfer Length, this will be

negative (twos complement).

Fixed Block Mode: The difference between the requested

number of records and the number of whole good records

transferred. If the last record was under length, it is

considered “whole good” for the purposes of this

calculation.

Filemark

CHECK

The Mark bit is set. Logical position will be on the EOM

side of the filemark. Additional sense is 0001h (filemark

detected). The logical position will be on the EOM side of

the filemark. Residue information is as described below.

encountered during COND’N SENSE

a read

EOD encountered

during a read

CHECK

BLANK

Additional sense is set to 0005h (EOD detected). Residue

COND’N CHECK information is as described below.

EOP/ M

CHECK MEDIUM The EOM bit is set. Additional sense is set to 0002h (EOP/

encountered during COND’N ERROR

M detected). Residue information is as described below.

a read

Failure to read data CHECK

MEDIUM Additional sense is set to 1100h (unrecovered read error)

through media error COND’N ERROR

or non-fatal drive

error

or 3B00h (sequential positioning error). Residue

information is as described below.

Corrupt data format CHECK

MEDIUM Additional sense set to 3002h (can’t read media).

COND’N ERROR

Blank media

CHECK

BLANK

Caused by an attempt to read an unformatted tape.

encountered during COND’N CHECK Additional sense is set to 5000h (EOD not found). Residue

a read information is as shown below.

NOTE: Early warning end of medium information is not reported on reads.

Residue information:

The Valid bit will be set. The information bytes will be as follows:

Variable Block Mode The requested transfer length (in bytes).

Fixed Block Mode

The difference (in blocks) between the requested transfer size and the actual

number of blocks transferred. A partially transferred block is not counted, so for

example, if 3.5 out of 10 blocks have been transferred the residue will be 7.

If the last block is an illegal length block, it is not counted among those transferred.

For example, if 4 legal length blocks and 1 illegal length block have been

transferred out of a total of 10, the residue will be 6.

108 Commands

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(CD-ROM mode)

08h

Transfer Length blocks of data are transferred to the host, starting from the current logical position

specified by Logical Block Address. Any spacing performed to locate to the specified block

address is performed with mark counting disabled.

Requests falling within the first 250 kilobytes of data on tape will be performed with very little

delay (less than 2 seconds) because the drive caches this data at load time.

Pre-execution checks:

Illegal Field

Fixed Bit

Flag Link

Bad LUN

Reservation

Media Access

Deferred Error

Diagnostic Status

Unit Attention

Command descriptor block:

Operation Code (08h)

(MSB)

Logical Block Address

(LSB)

Transfer Length

Control

CDB fields:

Logical Block Address Speci f i e s t he block a dd r e ss f r o m which to read. The tape drive will space to this

block before reading data.

Transfer Length

The number of blocks of data to return. Each CD-ROM block is 2048 bytes in

size. T h is size is a u tom a t ic a l ly set in the mode data’s fixed block length while in

CD-ROM mode.

Read 6 Specific status:

See the “Read specific status:” on page 108.

Residue Information:

See the “Residue information:” on page 108 for the normal Read command.

READ 6 (CD-ROM mode) 08h 109

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(CD-ROM mode)

28h

Transfer Length blocks of data are transferred to the host, starting from the current logical position

specified by Logical Block Address. Any spacing performed to locate to the specified block

address is performed with mark counting disabled.

Requests falling within the first 250 kilobytes of data on tape will be performed with very little

delay (less than 2 seconds) because the drive caches this data at load time.

Pre-execution checks:

Illegal Field

Fixed Bit

Flag Link

Bad LUN

Reservation

Media Access

Deferred Error

Diagnostic Status

Unit Attention

Command descriptor block:

Operation Code (28h)

DPO (0) FUA (0)

Logical Unit Number

Reserved (0)

RelAdr(0)

(LSB)

(MSB)

Logical Block Address

Reserved (0)

Transfer Length

Control

(LSB)

CDB fields:

Logical Block Address Speci f i e s t he block a dd r e ss f rom which to read. The tape drive will space to this

block before reading data.

Transfer Length

The number of blocks of data to return. Each CD-ROM block is 2048 bytes in

size. T h is size is a u tom a t ic a l ly set in the mode data’s fixed block length while in

CD-ROM mode.

Read 10 specific status:

See the “Read specific status:” on page 108.

Residue information:

See the “Residue information:” on page 108 for the normal Read command.

110 Commands

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READ ATTRIBUTE

8Ch

The READ ATTRIBUTE command allows an application client to read attribute values to MAM

(Medium Auxiliary Memory). It should be executed before sending a WRITE ATTRIBUTE command.

Pre-execution checks:

Illegal Field

Deferred Error

Unit Attention

Media Access

In order to execute a READ ATTRIBUTE command, there must be a cartridge in the drive, even if it is

only partially loaded, so that the MAM can be read.

Command descriptor block:

Operation Code (8Ch)

Reserved (0)

Service Action

Reserved (0)

Volume Number (0)

Reserved (0)

Partition Number (0)

(MSB)

First Attribute ID

Allocation Length

(LSB)

Reserved (0)

Control

CDB fields:

Service Action

Service actions are defined as follows. The data returned for each Service Action is

described below.

Code Name

Description

00h Attribute Values Returns the attribute values.

01h Attribute List

02h Volume List

03h Partition List

04h–1Fh Reserved

Returns a list of attribute IDs that are available (both

supported and existing IDs)

Returns a list of known volume numbers. For Ultrium

drives, there is only a single volume, Volume 0.

Returns a list of known partition numbers. For Ultrium

drives, there is only a single partition, Partition 0.

READ ATTRIBUTE 8Ch 111

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Element Address

Set to zero to indicate that Ultrium tapes only support a single element.

Element Type Code Set to zero to indicate that Ultrium tapes only support a single element.

Volume Number

Partition Number

First Attribute ID

Set to zero to indicate that Ultrium tapes only support a single volume.

Set to zero to indicate that Ultrium tapes only support a single partition.

The identifier of the first attribute to be returned. This field is not checked if the

Service Action value is 01h (Attribute List). If the attribute does not exist in MAM but

there are more attributes available after it, the data returned will contain the values

of those attributes. Otherwise CHECK CONDITION is returned with ILLEGAL

REQUEST sense.

Allocation Length

The maximum amount of data (in bytes) that will be returned to the host. The drive

will return the entire list of values or Allocation Length bytes, whichever is the lesser.

Returned data for service actions:

Attribute Values service action

This service reads the values of attributes for the specified volume and partition, starting at the First

Attribute ID. The attributes are returned in ascending numerical order. The format of the returned

data is as follows:

(MSB)

Available Data (n−3)

(LSB)

Attribute ID 1

Attribute ID x

The Available Data field contains the number of bytes of attribute values returned. Even if the data

returned has to be truncated because the Allocation Length is too small, the contents of the

Available Data field remain the same.

For details of the available attributes and the format of the data returned for each, see “MAM

attribute data” on page 115.

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Attribute List service action

This service action is used to retrieve the identifiers of all the attributes that are supported and exist.

The First Attribute ID field in the CDB is ignored. The attribute identifiers are returned in ascending

numerical order. The format of the returned data is as follows:

(MSB)

Available Data (n−3)

(LSB)

Attribute ID 1

Attribute ID x

The Available Data field specifies the number of bytes of attribute ID data returned. Even if the

data returned has to be truncated because the Allocation Length is too small, the contents of the

Available Data field remain the same.

A two-byte Attribute ID is returned for each attribute available on MAM. See “Attribute ID values”

on page 116 for a description of the Attribute ID values.

Partition List service action

The Partition List service action is used to report the number of partitions supported in the specified

volume, which in the case of Ultrium drives is 1. The Partition Number and Attribute fields in the

CDB are ignored. The information returned is as follows:

(MSB)

Available Data (2)

(LSB)

First Partition Number (0)

Number of Partitions Available (1)

The First Partition Number is the first partition available on the specified volume. Since Ultrium

drives do not support multiple partitions, this is 0.

The Number of Partitions Available indicates the number of partitions available on the specified

volume. Since Ultrium drives do not support multiple partitions, this is 1.

READ ATTRIBUTE 8Ch 113

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Volume List service action

The Volume List service action is used to report the number of volumes that the device server

supports, which in the case of Ultrium drives is 1. The Volume Number, Partition Number and

Attribute fields in the CDB are ignored. The information returned is as follows:

(MSB)

Available Data (2)

(LSB)

First Volume Number (0)

Number of Volumes Available (1)

The First Partition Number is the first volume. Since Ultrium drives do not support multiple volumes,

this is 0.

The Number of Volumes Available indicates the number of partitions available. Since Ultrium

drives do not support multiple volumes, this is 1.

Read Attribute specific status:

The command will be terminated and will return CHECK CONDITION under the following

circumstances:

Description

Sense Key

Additional Sense

There is no cartridge present in the drive, not even NOT READY

3A00h (medium not present)

partially loaded.

The MAM is not accessible even though there is a

tape in the drive.

MEDIUM

ERROR

0410h (MAM not accessible)

1112h (MAM read error)

2400h (invalid field in CDB)

The MAM has failed (for example from a bad

checksum).

MEDIUM

ERROR

The combination of Volume Number and Partition

Number is not valid.

ILLEGAL

REQUEST

The Service Action field does not match a supported ILLEGAL

Service Action ID.

REQUEST

The First Attribute ID field does not match a

supported First Attribute ID.

ILLEGAL

REQUEST

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MAM attribute data

Attribute data sent with a WRITE ATTRIBUTE command or returned in response to a READ ATTRIBUTE

command has the following format:

(MSB)

Attribute Identifier

Reserved (0)

(LSB)

Read-Only

(MSB)

Format

Attribute Length (n−4)

(LSB)

(MSB)

Attribute Value

The format implies nothing about the physical representation of the data in the Medium Auxiliary

Memory.

Attribute Identifier The binary identifier for a single attribute. See “Attribute ID values” on page 116

for a description of attribute ID values.

Read-Only

Format

Specifies whether an attribute is read-only. The bit is ignored by the READ

ATTRIBUTE command.

The attribute may be changed by the WRITE ATTRIBUTE command.

The attribute cannot be changed by WRITE ATTRIBUTE.

Specifies the data f o rm a t of t he a t tri b ute. T h e possible values are:

Value Description

00b

01b

Binary. The attribute contains binary data.

ASCII. Attributes contain only graphic codes (code values 20h–7Eh). It

must be left-aligned and contain 20h (ASCII space) in any unused bytes.

10b

Text. The attribute contains textual data. The character set is as

described in the Text Localization Identifier attribute in “Standard host

type attributes” on page 118.

11b

Reserved.

Attribute Length

The length in bytes of the Attribute Value field.

READ ATTRIBUTE 8Ch 115

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Attribute ID values

Attributes can be Standard or Vendor-Unique. There are three groups of attributes: Device,

Medium and Host attributes. Each group has a list of attributes, which characterize the group:

Attribute ID

Attribute Type

Standard/ Vendor-Unique

Standard

Read-Only

Yes

0000h–03FFh Device

0400h–07FFh Medium

0800h–0BFFh Host

Standard

Yes

Standard

0C00h–0FFFh Device

1000h–13FFh Medium

1400h–17FFh Host

Vendor-Unique

Yes

n/ a

1800h–FFFFh Reserved

WRITE ATTRIBUTES commands are only accepted for Host type attributes (either Standard or

Vendor-Unique).

Trying to read or write Device or Medium type Vendor-Unique attributes will fail and CHECK

CONDITION status is reported. Sense data will be as described in the Illegal Field Checks.

Standard device type attributes

Attribute

Size (bytes) Format

0000h

0001h

0002h

0003h

0004h

0005h

0006h

Remaining capacity in partition

Maximum capacity in partition

TapeAlert flags

Binary

ASCII

Load count

MAM space remaining

Assigning organization

Formatted density code

Binary

0007h–0209h Reserved

020Ah

020Bh

020Ch

020Dh

Device make/ serial number at last load

ASCII

Device make/ serial number at load –1

Device make/ serial number at load –2

Device make/ serial number at load –3

020Eh–021Fh Reserved

0220h

0221h

0222h

0223h

Total MB written in medium life

Binary

Total MB read in medium life

Total MB written in current/ last load

Total MB read in current/ last load

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Attribute

Size (bytes) Format

0224h–03FFh Reserved

Remaining capacity in partition and Native c a pa c iti e s i n M B , a s suming no d a t a compression.

Maximum capacity in partition

TapeAlert flags

The bits specify flags that were set during the previous load. 1 bit

per flag (MSB = flag 1, LSB = flag 64).

Load count

The number of times this tape has been fully loaded. It is never

reset.

MAM space remaining

The space currently free in the MAM. The total MAM capacity is

reported in the MAM Capacity attribute defined in “Standard

medium type attributes” on page 118.

Note that it may not always be possible to use all the free space in

a given MAM implementation. Depending on the internal

organization of the memory and the software that controls it,

fragmentation issues may mean that certain attribute sizes might

not be fully accommodated as the MAM nears its maximum

capacity.

Assigning organization

Formatted density code

The Vendor ID of the organization that will define attribute 0006h.

It contains the string “LTO-CVE”.

The medium density code.

Device make/ serial number at last These attributes provide a rolling history of the last four device

load and Device make/ serial

number at load –n

servers in which the tape has been loaded. The format of the

attributes is as follows:

(MSB)

Vendor Identification

(LSB)

(MSB)

Product Serial Number

Vendor Identification

The same value as is returned in the SCSI INQUIRY command by

the device server, padded with ASCII spaces (20h).

Product Serial Number Vendor-assigned serial number, padded with ASCII spaces (20h).

Total MB written in medium life The total number of data bytes written to or read from the tape (after any

and

data compression has been applied) over the entire tape life. These

Total MB read in medium life figures are cumulative and will never be reset.

Total MB written in current/ last These are similar to the attributes above but apply to the current load (if

load and Total MB read in

current/ last load

the tape is currently loaded) or the last load (if the tape is currently

unloaded). The device server should reset these attributes to zero when

the tape is loaded.

READ ATTRIBUTE 8Ch 117

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Standard medium type attributes

Size

(bytes)

Attribute

Format Description

0400h Medium manufacturer

0401h Medium serial number

ASCII The name of the manufacturer.

ASCII The serial number, left-aligned and padded with

ASCII spaces (20h).

0402h Medium length

Binary The length of the tape in meters. A value of 0

means the length is undefined.

0403h Medium width

Binary 127 The width of the tape in mm

ASCII Contains the string “LTO-CVE”.

Binary The tape density code.

0404h Assigning organization

0405h Medium density code

0406h Medium manufacturer date

ASCII The date of manufacture in the format

YYYYMMDD.

0407h MAM capacity

0408h Medium type

Binary The total capacity of the MAM, not its free space.

Binary The type of tape:

Data cartridge

Cleaning cartridge

Other values are reserved.

0409h Medium type information

Binary Only meaningful for a cleaning cartridge, where it

gives the maximum number of cleaning cycles

permitted.

040Ah – Reserved

07FFh

Standard host type attributes

These only exist if they are initialized by an application:

Size

(bytes)

Attribute

Format Description

0800h Application vendor

0801h Application name

0802h Application version

0803h User medium text label

ASCII

160

Text The user level identifier for the tape.

ASCII Format is YYYYMMDDHHMM (0–24 hours)

0804h Data and time last written 12

0805h Text localization identifier

Binary Defines the character set for the attributes defined as

“text”. See the table below.

0806h Barcode

32 ASCII Allows an application server to store the

contents of a barcode associated with the

medium in the MAM. Format is YYYYMMDD.

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Size

(bytes)

Attribute

Format Description

0807h Owning host textual name 80

Text The host server from which the User Medium Text

Label originates.

0808h Media pool

160

Text Indicates the media pool to which this tape belongs.

0809h Partition user text label*

080Ah Load/ unload at partition*

16 ASCII Identifier for the partition specified in the CDB.

Binary

The load or unload occurs at the beginning of

the tape. This is the default setting if the attribute

does not exist.

Loads and unloads at the partition specified in

the CDB are allowed

080Bh Application format version 16 ASCII

080Ch– Reserved

BFFh

*0809h and 080Ah are optional for LTO drives because they only support a single partition.

Text localization indentifiers

The Text Localization Identifier defines the character set used for attributes with a text format:

00h

Format

No code specified (ASCII)

ISO/ IEC 8859-1 (Europe, Latin America)

ISO/ IEC 8859-2 (Eastern Europe)

ISO/ IEC 8859-3 (SE Europe/ miscellaneous)

ISO/ IEC 8859-4 (Scandinavia/ Baltic)

ISO/ IEC 8859-5 (Cyrillic)

ISO/ IEC 8859-6 (Arabic)

ISO/ IEC 8859-7 (Greek)

ISO/ IEC 8859-8 (Hebrew)

ISO/ IEC 8859-9 (Latin 5)

ISO/ IEC 8859-10 (Latin 6)

Reserved

01h

02h

03h

04h

05h

06h

07h

08h

09h

0Ah

0Bh–7Fh

80h

ISO/ IEC 10646 (Unicode)

ISO/ IEC 10646 -1, Amendment no. 2 (UTF-8)

Reserved

81h

82h–FFh

READ ATTRIBUTE 8Ch 119

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READ BLOCK LIMITS

05h

READ BLOCK LIMITS tells the drive to return data defining the maximum block size that it can

support. Note that this is the maximum supportable, not the fixed block size.

Pre-execution checks:

Illegal Field

Reservation

Deferred Error

Unit Attention

Command descriptor block:

Operation Code (05h)

Reserved (0)

Control

Read Block Limits data:

00h

(MSB)

Maximum Block Length

(FFFFFFh)

(LSB)

(MSB)

Minimum Block Length (0001h)

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READ BUFFER

3Ch

READ BUFFER reads data from the memory on the drive and sends it to the initiator. The value of

the Mode field determines whether only the 4-byte descriptor is returned, only the data is returned,

or whether both are returned.

Pre-execution checks:

Illegal Field

Reservation

Deferred Error

Unit Attention

If any of the following rules are broken then CHECK CONDITION status is reported. Sense data will

be as described in Illegal Field Checks.

Command descriptor block:

Operation Code (3Ch)

Reserved(0)

Mode

Buffer ID

(MSB)

Buffer Offset

(LSB)

Allocation Length

Control

CDB fields:

Mode

00000b A 4 -byte descriptor is returned, followed by (Allocation Length − 4) bytes of data.The data

is read from the buffer identified by the Buffer ID, starting from offset zero in the buffer.

The Buffer ID and Buffer Offset must both be 00h.

00010b The drive returns Allocation Length bytes of data which is read from the buffer identified

by the Buffer ID, starting from Buffer Offset bytes from the start of the buffer.

There are no restrictions on the value of Buffer ID and Buffer Offset, except that the Buffer

Offset must be kept within the buffer size.

00011b The drive returns a 4 -byte descriptor for the buffer identified by the Buffer ID field. Invalid

buffer IDs will return a buffer descriptor of all zeros.

The Buffer Offset field must be zero.

01010b The drive returns data from the Echo Buffer. The Buffer ID and Offset are ignored.

01011b The drive returns the Echo Buffer descriptor. The Buffer ID and Offset are ignored.

The Buffer ID indicates which buffer is to be read. The buffers are defined as follows:

Buffer ID

Buffer ID Memory Area

Category

RAM

Offset Boundary

4 bytes

00h Main buffer memory

01h Processor addressable memory

RAM

1 byte

READ BUFFER 3Ch 121

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02h SCSI burst buffer

RAM

EEPROM

RAM

4 bytes

1 byte

10h CM EEPROM

11h Mechanical EEPROM

12h Head assembly EEPROM

13h PCA EEPROM

1 byte

20h Main buffer segment 0

21h Main buffer segment 1

4 bytes

see below for details

RAM

22h

23h

24h

25h

26h

27h

Main buffer segment 2

Main buffer segment 3

Main buffer segment 4

Main buffer segment 5

Main buffer segment 6

Main buffer segment 7

RAM

Buffer Offset The Buffer Offset field may be set to any address in the buffer, but must obey the specified Offset

Boundary.

Allocation

Length

The amount of data to return. Allocation Length + Buffer Offset must be within the buffer size.

Memory sizes:

Main Buffer Memory

Size: 128 MB, reported size FFFFFFh.

Because the buffer is greater than 16 MB, additional buffer IDs have been

defined to allow the buffer to be accessed in 16 MB segments. these are as

follows:

Buffer ID

20h

Address

00000000h + Buffer Offset (same as Buffer ID 00h)

01000000h + Buffer Offset (in other words, +16 MB)

02000000h + Buffer Offset (in other words, +32 MB)

03000000h + Buffer Offset (in other words, +48 MB)

04000000h + Buffer Offset (in other words, +64 MB)

05000000h + Buffer Offset (in other words, +80 MB)

06000000h + Buffer Offset (in other words, +96 MB)

07000000h + Buffer Offset (in other words, +112 MB)

21h

22h

23h

24h

25h

26h

27h

Processor Memory

Not all of the Processor Memory space is accessible. The following table

shows valid address segments:

Segment

Start Address

100000h

200000h

380000h

Segment Size

100000h

80000h

Segment Description

External flash

External SRAM (if fitted)

Formatter ASIC

80000h

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400000h

FF8000h

40000h

7000h

Servo Controller ASIC

Controller internal SRAM

SCSI Burst Buffer

3F8000h bytes

Size = 4 KB

Size = 8 KB

LTO-Cartridge Memory

Mechanism EEPROM

Head Assembly EEPROM Size = 16 KB

PCA EEPROM

Size = 32 KB

Returned data:

The format of the 4-byte descriptor for Mode 00000b is as follows:

Reserved (0)

(MSB)

Buffer Capacity

(LSB)

The format of the 4-byte descriptor for Mode 00011b is as follows:

Buffer Offset Boundary

(MSB)

Buffer Capacity

(LSB)

The format of the 4-byte Echo buffer descriptor for Mode 01011b is as follows:

Reserved (0)

EBOS (1)

(MSB)

Echo Buffer Size (1000h)

(LSB)

READ BUFFER 3Ch 123

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READ CAPACITY(CD-ROM mode)

25h

READ capacity transfers Read Capacity data to the host.

Pre-execution checks:

Illegal Field

Fixed Bit

Flag Link

Bad LUN

Reservation

Deferred Error

Unit Attention

If the drive is not in CD-ROM mode, the request will return CHECK CONDITION status with a sense

key Illegal Command.

Command descriptor block:

Operation Code (25h)

Reserved (0)

Logical Unit Number

RelAdr(0)

(LSB)

(MSB)

Logical Block Address (0)

Reserved (0)

Control

PMI

CDB fields:

Logical Block Address This flag is ignored. It is recommended that it should be zero.

PMI

This flag is ignored. It is recommended that it should be zero.

Read Capacity data

The following data is always returned:

(MSB)

Returned Logical Block Address

(0004B000h)

(LSB)

(MSB)

Block Length in bytes

(00000800h)

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READ MEDIA SERIAL NUMBER

ABh

READ MEDIA SERIAL NUMBER provides a method for the host application to read the serial number

of the cartridge currently loaded in the drive.

Pre-execution checks:

Illegal Field

Reservation

Deferred Error Unit Attention Media Access

Command descriptor block:

Operation Code (ABh)

Service Action (01h)

Reserved(0)

Reserved (0)

(MSB)

Allocation Length

(LSB)

Reserved(0)

Control

CDB fields:

Service Action

01h The Service Action must be set to 01h.

Allocation

Length

The maximum amount of data (in bytes) to be returned to the host. The drive will return

the entire serial number string or allocation length bytes, whichever is least.

If there is no cartridge in the drive, the command is terminated with CHECK CONDITION status. The

sense key is set to NOT READY with additional sense of 3A00h (medium not present).

Returned data:

The data returned depends on whether a barcode number has been stored in the LTO-CM using

the WRITE ATTRIBUTE command. Storing this is the responsibility of the library controller or host

application.

READ MEDIA SERIAL NUMBER ABh 125

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No barcode stored:

(MSB)

Serial Number Length (0Ch)

Cartridge Serial Number

ASCII NUL characters (00h)

(LSB)

Cartridge Serial The serial number of 10 ASCII characters stored in the LTO-CM Cartridge

Number

Manufacturer’s Information page.

Barcode stored:

(MSB)

Serial Number Length (2Ch)

Cartridge Serial Number

ASCII Space characters (20h)

Barcode Number

(LSB)

Barcode Number The barcode number of 32 ASCII characters stored in the LTO-CM Application

Specific page.

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READ POSITION

34h

The READ POSITION command returns data representing the current logical position to the host.

The position is the count of all marks and blocks between BOM and the current logical position.

The first block is block 0.

The command causes no tape movement.

The Read Position command is complimented by the LOCATE command.

Pre-execution checks:

Illegal Field

Reservation

Deferred Error

Unit Attention

Media Access

Diagnostic Status

Command descriptor block:

Operation Code (34h)

Reserved(0)

Service Action

Reserved (0)

Allocation Length

Control

CDB fields:

Service Action

The following values are supported:

00h Short Form Block ID

06h Long Form

08h Extended Form

Allocation Length For Service Actions 00h and 06h, must be 0.

READ POSITION 34h 127

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Short Form Block ID

BOP

EOP

LOCU (1) BYCU (1) Rsvd (0) LOLU (0)

Partition Number (0)

PERR

Rsvd (0)

Reserved (0)

(MSB)

First Block Location

(LSB)

Last Block Location

(same as First Block Location)

Reserved (0)

(MSB)

Number of blocks in buffer (0)

(LSB)

Number of bytes in buffer (0)

Returned data fields:

BOP

The current logical position is not at BOM (beginning of media).

The current logical position is at BOM.

EOP

The current logical position is within the EW-EOM region.

The number of blocks in the buffer is unknown.

The number of bytes in the buffer is unknown.

LOCU

BYCU

LOLU

The Partition Number, First Block Location and Last Block Location fields are

valid.

PERR

No position error

There has been a position error caused by the overflow of some position field

data.

Partition Number This will always be zero.

First Block

Location

The number of blocks and filemarks from BOM to the current position. Counting starts

at zero, so BOM is block location 0.

Last Block

Location

Always set to the value of the First Block Location.

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Long Block Form ID

BOP

EOP

Reserved (0)

MPU

LONU (0)

Reserved (0)

(MSB)

Partition Number (0)

Block Number

File Number

(LSB)

Set Number(0)

Returned data fields:

MPU

Mark Position Unknown

The File Number and Set Number fields are valid.

The Partition Number and Block Number are valid.

LONU

Partition Number This will always be zero because Ultrium drives do not support multiple partitions.

Block Number

The number of logical blocks between BOP (beginning of partition) and the current

logical position. Filemarks count as one logical block each.

File Number

Set Number

The number of filemarks between BOP and the current logical position.

The number of setmarks between BOP and the current logical position.

READ POSITION 34h 129

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Extended Block Form ID

BOP

EOP

LOCU (1) BYCU (1) Rsvd (0) LOLU (0)

Partition Number (0)

Reserved (0)

Additional Length (1Ch)

Reserved (0)

(MSB)

Number of blocks in buffer (0)

(LSB)

First Block Location

(LSB)

Last Block Location

(same as First Block Location)

Number of bytes in buffer (0)

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READ TOC

(CD-ROM mode)

43h

READ TOC transfers the Table of Contents data to the host.

Pre-execution checks:

Illegal Field

Fixed Bit

Flag Link

Bad LUN

Reservation

Media Access

Deferred Error

Diagnostic Status

Unit Attention

If the drive is not in CD-ROM mode, the request will return CHECK CONDITION status with a sense

key Illegal Command.

The Track/ Session Number must be set to 0 or 1. Any other value will result in CHECK CONDITION

status with sense data as described in Illegal Field Checks.

Command descriptor block:

Operation Code (43h)

Reserved (0)

Logical Unit Number

MSF

RelAdr(0)

Reserved (0)

Format (0)

(MSB)

Reserved (0)

Track/ Session Number

Allocation Length

Control

(LSB)

CDB fields:

MSF

This flag is ignored.

Track/ Session Number This may be set to 0 or 1. It does not affect the data returned.

Allocation Length The maximum number of data bytes that may be returned.

READ TOC (CD-ROM mode) 43h 131

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Read TOC data

The following data is always returned:

(MSB)

TOC Data Length (12h)

(LSB)

First Track Number (1)

Last Track Number (1)

Reserved (0)

ADR (1)

Control (4)

Track Number (1)

Reserved (0)

(MSB)

Logical Block Address

(00000000h)

(LSB)

Reserved (0)

ADR (1)

Control (4)

Track Number (AAh)

Reserved (0)

Logical Block Address

(0004B000h)

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RECEIVE DIAGNOSTICS RESULTS

1Ch

RECEIVE DIAGNOSTIC RESULTS tells the drive to return data from the last diagnostic test requested

through the SEND DIAGNOSTIC command. If none has been sent, the data refers to the power-on

self-test.

Pre-execution checks:

Illegal Field

Reservation

Deferred Error

Unit Attention

Command descriptor block:

Operation Code (1Ch)

Reserved(0)

PCV

Page Code

(MSB)

Allocation Length

Control

(LSB)

CDB fields:

PCV

The page code valid flag is ignored.

Page Code

Identifier for the diagnostic information page to be returned.

Allocation

Length

No data will be returned. This is not considered an error. The drive will return

allocation length bytes or the amount of data that is available, whichever is least.

>0 The number of bytes which the host has allocated for returned diagnostic data.

Specific status:

If the drive not is connected to a compatible enclosure, a RECEIVE DIAGNOSTIC command with a

Enclosure Services page number (01 to 0F) will return a CHECK CONDITION with Sense key of NOT

READY and additional sense of 3502h, “enclosure services unavailable”.

If other invalid pages are requested, CHECK CONDITION will result with status of ILLEGAL REQUEST

and additional sense of 2601h, “parameter not supported”.

RECEIVE DIAGNOSTICS RESULTS 1Ch 133

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Data returned

Page code 70h — Self-Test (Read/ Write)

Page Format for Write:

Page Code (70h)

Reserved (0)

(MSB)

Parameter List Length (0)

(LSB)

No parameters are needed. Sending this page is equivalent to a Send Diagnostic command with

both the SelfTest and UnitOfl bits set.

Page format for Read:

Page Code (70h)

Reserved (0)

(MSB)

Parameter List Length (4)

Error Code

(LSB)

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RELEASE UNIT

17h/ 57h

RELEASE UNIT enables the host to release any reservation it may have on the drive. Reserving a

device is a way of ensuring exclusive access to that device from a single initiator for the period of

the reservation. The drive may be reserved using a RESERVE command.

Pre-execution checks:

Illegal Field

Deferred Error

Unit Attention

Command descriptor block:

6-byte

Operation Code (17h)

3rd Pty Third-Party Device ID

Reserved (0)

Rsvd(0)

Reserved (0)

Control

This bit is always zero because third-party reservation is not supported.

3rdPty

Third-Party Device ID This bit is always zero because third-party reservation is not supported.

10-byte

Operation Code (57h)

3rd Pty Reserved (0)

Reserved (0)

LongID

Rsvd(0)

Third-Party Device ID

Reserved (0)

(MSB)

Parameter List Length

Control

(LSB)

10-byte only

3rd Pty

Third-party release is not requested.

The initiator requests third-party release. The value in the Third-Party

Device ID field is valid.

RELEASE UNIT 17h/ 57h 135

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LongID

This is always zero because device IDs greater than 255 are not supported.

Third-Party Device ID

This is required and used only when the 3rd Pty bit is set. The device will

perform the release operation only if the initiator ID, the 3rd Pty bit and the

Third-Party Device ID are identical to those in the RESERVE UNIT command

that established the reservation.

The drive ignores any attempt to release the reservation made by any other

initiator, including the initiator for which the reservation was made.

If an initiator reserved the drive using a third-party reservation over itself, a

non-third-party RELEASE UNIT command could also release the reservation.

Release Unit specific status:

Status is returned as follows:

•

If the drive is not reserved, GOOD status is reported.

If the drive is reserved by another host, GOOD status is reported.

If the drive is reserved by this host for this host, the reservation status is cleared.

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REPORT DENSITY SUPPORT

44h

The Report Density Support command returns details about the tape formats supported by the drive.

The data is returned as a header and a series of descriptor blocks.

Pre-execution checks

Illegal Field

Deferred Error

Unit Attention

Command descriptor block

Operation Code (44h)

Reserved (0)

Media

Reserved (0)

(MSB)

Allocation Length

Control

(LSB)

CDB fields

Media

One descriptor block is returned for each format supported by the drive. The

capacity field in the descriptor block will indicate the capacity of the current

media.

One descriptor block is returned with the data for the currently loaded tape. The

capacity field will indicate the maximum for the format. If there is no tape

inserted in the drive, the drive will return CHECK CONDITION with a sense key of

NOT READY and additional sense of 3A 00h (medium not present).

Allocation

Length

This specifies the maximum number of bytes which the drive should return in its data -out

phase. Either the entire available data or allocation length bytes of the page are

returned, whichever is least.

No data transfer will occur. This is not considered an error.

Header

(MSB)

Available Density Descriptor Length

(LSB)

Reserved (0)

The available length gives the total amount of data available to be returned.

REPORT DENSITY SUPPORT 44h 137

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Descriptor blocks

The header is followed by one or more Report Density Support descriptor blocks with the following

format:

Primary Density Code

Secondary Density Code

WRTOK

DUP (0)

DEFLT

Reserved (0)

(MSB)

Bits per mm

Media Width

Tracks

(LSB)

Capacity (MB)

Assigning Organization (LTO-CVE)

Density Name

Description

The values reported for Ultrium 3 format tapes are as follows:

Primary Density Code

Secondary Density Code

WRTOK

44h

This is reported via the Mode Sense command.

Not used

The Write OK flag indicates whether the drive can write at the density

indicated by the Density Code.

The drive does not support writing to a tape with this density.

The drive is capable of writing at this density to the current

tape (if the Media bit in the CDB = 1) or for some tape (if

Media = 0).

DUP

The Duplicate flag will be set to zero for every descriptor block indicating that

each density is only reported once.

DEFLT

The Default flag will be set for the density for which the currently mounted

medium is formatted and clear for all other densities.

Bits per mm

4880

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Media Width

127

704

Tape width is 1/ 2” or 12.65 mm. The value in this field is in

tenths of millimeters rounded to the nearest 0.1 mm.

Tracks

Capacity

400,000 MB The maximum capacity for the format (or the capacity of the

media if the Media bit is set)

Assigning Organization

Density Name

LTO-CVE

U-316

The CVE assigns these codes.

The format of this is:

[U/A]-[Format Generation: 1,2...][No of Tracks:

4,8,16...]

Description

Ultrium 3/ 16T A longer version of the above

If this command is sent to the HP Ultrium 3 drive with the Media bit set to 0, three descriptor blocks

will be returned with key values as follows:

Density Code

WRTOK

DEFLT

Capacity

186A0h

30D40h

61A80h

40h

42h

44h

REPORT DENSITY SUPPORT 44h 139

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REPORT DEVICE IDENTIFIER

A3h

Description:

The REPORT DEVICE IDENTIFIER command returns the identifier of the current device to the initiator.

Pre-execution checks:

Illegal Field

Reservation

Deferred Error

Unit Attention

Command descriptor block:

Operation Code (A3h)

Service Action (05h)

Reserved (0)

(MSB)

Allocation Length

(LSB)

Reserved (0)

Control

CDB fields:

Allocation Length The number of bytes that have been allocated for the Device Identifier The actual

number returned will be the lower of the stored Device Identifier length and the

allocation length specified in this command.

Data returned:

The returned Parameter Data is as follows:

(MSB)

Identifier Length (n–3)

(LSB)

Identifier

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REPORT LUNS

A0h

Description:

The Report LUNS command allows the host to retrieve information about what logical units the drive

supports. The standard drive only has a single LUN.

Pre-execution checks:

Illegal Field

Command descriptor block

Operation Code (A0h)

Reserved (0)

Select Report

Reserved (0)

(MSB)

Allocation Length

(LSB)

Reserved (0)

Control

CDB fields:

Select Report

The type of logical unit address that will be reported. Allowable values:

00h/ 02h Report all logical units accessible by the initiator through the address

target port.

01h

No logical unit descriptors are returned because there are no well-known

logical units.

03h–FFh Reserved. CHECK CONDITION returned.

Allocation Length Must be at least 16 bytes. If not, the drive will return CHECK CONDITION status and

provide a sense key of ILLEGAL REQUEST and additional sense of 2400h (invalid

field in CDB).

REPORT LUNS A0h 141

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Data returned:

(MSB)

LUN List Length (08h)

(LSB)

Reserved (0)

List of LUNs

LUN 0 (0)

(MSB)

(LSB)

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REPORT SUPPORTED OPCODES

A0h

Description:

The REPORT SUPPORTED OPCODES command requests information on commands supported by

logical unit that is addressed.

Pre-execution checks:

Illegal Field

Reservation

Deferred Error

Command descriptor block:

Operation Code (A0h)

Service Action (0Ch)

Reporting Options

Reserved (0)

Requested Operation Code(0)

(MSB)

Requested Service Action

Allocation Length

(LSB)

Reserved (0)

Control

CDB fields:

Reporting Options

000b Only reporting option 000b is supported. This requests that the

Device Server returns a list of supported operations and service

actions from the port through which the REPORT SUPPORTED

OPERATION CODES command was received.

Requested Operation Code Ignored for Reporting Option 000b.

Requested Service Action Ignored for Reporting Option 000b.

Allocation Length

The number of bytes allocated for the returned parameter data.

REPORT SUPPORTED OPCODES A0h 143

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Data returned

The returned Parameter Data contains a 4-byte header followed by one or more command

descriptors:

(MSB)

Command Data Length

(LSB)

Command Data Length

The amount of Parameter Data available for return minus the size of the

header.

Each command descriptor contains either a supported Operation Code or an Operation Code/

Service Action combination. The format of each descriptor is as follows:

Operation Code

Reserved (0)

(MSB)

Service Action

(LSB)

ServActv

(LSB)

Reserved (0)

CDB Length

(MSB)

Operation Code The operation code of the supported command.

Service Action

A supported service action of the operation code. If no service actions are supported

this field will be 00h.

ServActv

No service actions are supported and the Service Action field should be

ignored.

This operation code supports service actions and the Service Action field

contains a valid service actions.

CDB Length

The length of the CDB for this operation code or operation code/ service action

command.

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REPORT SUPPORTED TASK MANAGEMENT

FUNCTIONS

A3h

Description:

The REPORT SUPPORTED TASK MANAGEMENT FUNCTIONS command returns information about

which task management functions are supported by the logical unit that is addressed.

Pre-execution checks:

Illegal Field

Reservation

Deferred Error

Unit Attention

Diagnostic Status

Command descriptor block:

Operation Code (A3h)

Service Action (0Dh)

Reserved (0)

(MSB)

Allocation Length

(LSB)

Reserved (0)

Control

CDB fields:

Allocation Length

The number of bytes that have been allocated for the returned parameter

data. This value must be at least four.

Data returned:

The returned Parameter Data is as follows:

ATS

ATSS

CACAS

CTSS

LURS

QTS

TRS

WakeS

Reserved (0)

ATS

The Abort Task task management function is supported.

The Abort Task Set task management function is supported.

The Clear ACA task management function is not supported.

ATSS

CACAS

REPORT SUPPORTED TASK MANAGEMENT FUNCTIONS A3h 145

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CTSS

LURS

QTS

The Clear Task Set task management function is supported.

The Logical Unit Reset task management function is supported.

The Q uery Task task management function is not supported.

The Target Reset task management function is not supported.

The Wakeup task management function is not supported.

TRS

WakeS

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REQUEST SENSE

03h

The REQUEST SENSE command transfers sense data held within the drive to the host during a data-

in phase. The data is valid in the following circumstances:

•

After reporting CHECK CONDITION status to the host.

After a command has terminated with an unexpected BUS FREE.

Immediately after the following commands that cause tape motion:

READ

SPACE

VERIFY

WRITE

WRITE FILEMARKS

REWIND

Positional sense data is valid whenever media is present and loaded and no higher priority sense

data is present. An unsolicited request sense (that is, one with no preceding CHECK CONDITION)

will result in sense data with no valid data, which will be all zeros.

NOTE: The drive maintains valid positional information for normal read and write commands

only (READ, WRITE, SPACE, WRITE FILEMARKS, REW IND). If abnormal commands (such as WRITE

BUFFER) are received this positional sense information is lost. See “Sense data management”

on page 154.

The drive clears sense data for the host following execution of the REQUEST SENSE command for

that host, unless the data is positional sense data.

Pre-execution checks:

Only Illegal Field Check is performed before execution of the command.

Command descriptor block:

Operation Code (03h)

Reserved (0)

LUN

DESC

2–3

Allocation Length

Control

CDB fields:

LUN

This field is ignored.

DESC

Fixed Format sense data will be returned.

Descriptor Format sense data will be returned.

REQUEST SENSE 03h 147

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Allocation

Length

No data is transferred to the host.

>0 The maximum amount of sense data in bytes that should be transferred to the host.

The drive returns up to Allocation Length bytes of data; any extra sense data is lost.

Request Sense data

Sense data is recovered from the drive by means of a REQUEST SENSE command following the

reporting of CHECK CONDITION by the drive. There are two formats in which the data can be

returned: Fixed and Descriptor.

Fixed format

The Fixed format of the returned data is as follows:

Valid

Error Code

Segment Number (0)

Rsvd(0)

Mark

EOM

ILI

Sense Key

(MSB)

Information Bytes

(LSB)

Additional Sense Length (10h)

(MSB)

Command Specific Information Bytes

18–20

Additional Sense Code

Additional Sense Code Qualifier

Field Replaceable Unit Code

SKSV

(MSB)

C/ D

Reserved (0)

BPV

Bit Pointer

Field Pointer/ Drive Error Code

(LSB)

Reserved (0)

CLN

Reserved (0)

Pad bytes (0)

Returned Sense data fields:

Valid

Indicates that the information bytes contain valid information as defined in

the SCSI specification.

Error Code

70h Indicates that the error is current, that is, it is associated with the command

for which CHECK CONDITION status has been reported.

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71h Indicates that the error is deferred. A deferred error occurs when there is a

failure for an operation that has already been terminated with a GOOD

status, or when failure occurs in “cleanup” activity following an operation

that was terminated by BUS RELEASE. The command for which CHECK

CO NDITION status was reported is therefore unlikely to be the cause of the

deferred error. It simply gives the drive the opportunity to report CHECK

CO NDITION status for an error that already exists.

Segment Number This field is cleared to zero.

Mark

The Mark bit is set to 1 if a SPACE, READ or VERIFY command did not

complete because a filemark was read. This bit may only be set if the sense

key is NO SENSE.

EOM

The End of Medium fl a g i s set if a WRITE or WRITE FILEMARKS command

completed in the early warning area. If no other error occurred, the sense

code will be set to NO SENSE with additional sense of 0002h (EOT). If

another error occurred, the sense code and additional sense will reflect that

error. It is also set if BOP is encountered while spacing over blocks or

filemarks in the reverse direction.

ILI

Indicates that the requested block length did not match the actual block

length. Only READ and VERIFY can cause this bit to be set.

Sense Key

See “Sense Keys” on page 157 for details of sense keys that can be returned.

Information Bytes The Information Bytes field is only valid if the Valid bit is set. It contains residue

information following the failure of either a READ, WRITE, W RITE FILEMARKS or SPACE

command. The field can take a negative value, expressed in 2’s complement

notation for the SPACE command. See the description of the command that failed for

the contents of the field.

Additional Sense

Length

10h Specifies the number of additional sense bytes to follow. It is never truncated

to reflect the actual Transfer Length.

Command Specific

Information Bytes

Provides additional information specific to the failing command. The field is

normally set to 0.

Additional Sense

These two bytes provide additional information about the cause of the CHECK

Code and Qualifier CO NDITION, or the current tape position when the REQUEST SENSE is unsolicited.

See “Additional Sense Codes” on page 159.

SKSV

The Sense Key Specific Bytes (bytes 15 through 17) are invalid. The C/ D,

BPV and Bit pointer fields will be zero. The top byte of the Field Pointer will

be zero, and the bottom byte will contain a product-specific error code.

The Sense Key Specific Bytes are valid. This will only happen when the bytes

assume the role of Field Pointer Bytes as defined by ANSI. This occurs when

an Illegal Field check detects an error in a command descriptor block or a

Parameter List check detects an error in a command parameter list.

C/ D

Command Data. Only valid if the SKSV flag is set.

The Field Pointer information applies to the parameter list for the command.

The Field Pointer information applies to the command descriptor block.

REQUEST SENSE 03h 149

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71h Indicates that the error is deferred. A deferred error occurs when there is a

failure for an operation that has already been terminated with a GOOD

status, or when failure occurs in “cleanup” activity following an operation

that was terminated by BUS RELEASE. The command for which CHECK

CO NDITION status was reported is therefore unlikely to be the cause of the

deferred error. It simply gives the drive the opportunity to report CHECK

CO NDITION status for an error that already exists.

Segment Number This field is cleared to zero.

Mark

The Mark bit is set to 1 if a SPACE, READ or VERIFY command did not

complete because a filemark was read. This bit may only be set if the sense

key is NO SENSE.

EOM

The End of Medium flag is set if a WRITE or WRITE FILEMARKS command

completed in the early warning area. If no other error occurred, the sense

code will be set to NO SENSE with additional sense of 0002h (EOT). If

another error occurred, the sense code and additional sense will reflect that

error. It is also set if BOP is encountered while spacing over blocks or

filemarks in the reverse direction.

ILI

Indicates that the requested block length did not match the actual block

length. Only READ and VERIFY can cause this bit to be set.

Sense Key

See “Sense Keys” on page 157 for details of sense keys that can be returned.

Information Bytes The Information Bytes field is only valid if the Valid bit is set. It contains residue

information following the failure of either a READ, WRITE, W RITE FILEMARKS or SPACE

command. The field can take a negative value, expressed in 2’s complement

notation for the SPACE command. See the description of the command that failed for

the contents of the field.

Additional Sense

Length

10h Specifies the number of additional sense bytes to follow. It is never truncated

to reflect the actual Transfer Length.

Command Specific

Information Bytes

Provides additional information specific to the failing command. The field is

normally set to 0.

Additional Sense

These two bytes provide additional information about the cause of the CHECK

Code and Qualifier CO NDITION, or the current tape position when the REQUEST SENSE is unsolicited.

See “Additional Sense Codes” on page 159.

SKSV

The Sense Key Specific Bytes (bytes 15 through 17) are invalid. The C/ D,

BPV and Bit pointer fields will be zero. The top byte of the Field Pointer will

be zero, and the bottom byte will contain a product-specific error code.

The Sense Key Specific Bytes are valid. This will only happen when the bytes

assume the role of Field Pointer Bytes as defined by ANSI. This occurs when

an Illegal Field check detects an error in a command descriptor block or a

Parameter List check detects an error in a command parameter list.

C/ D

Command Data. Only valid if the SKSV flag is set.

The Field Pointer information applies to the parameter list for the command.

The Field Pointer information applies to the command descriptor block.

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BPV

Bit Pointer Valid

The Bit Pointer field is invalid.

The Bit Pointer field is valid. If the SKSV bit is set then the BPV bit must be set

as well.

Bit Pointer

Identifies the bit position of the field in error, whether it is a command descriptor or

a command parameter list field. When a multi-bit field is in error, this will point to

the most significant bit of that field. Only valid when the SKSV flag is set.

Field Pointer

If SKSV = 1, the interpretation of this field depends on the sense key reported.

/ Drive Error Code

For Sense Key = 5 (ILLEGAL REQUEST), this field represents the Field Pointer,

identifying in which byte of the command descriptor or parameter list an error was

detected.

Note that the drive scans from byte 0 bit 7 of a command or parameter list through

to byte n bit 0. The field and bit pointers are set to point to the most significant bit of

the field that is in error. See the illegal field check and the parameter list check.

For Sense Key = 0 (NO SENSE) or 2 (NOT READY), this field represents the Progress

Indication, where the returned value is a numerator that has 65536 (10000h) as its

denominator. This reflects the progress being made through the total operation

If SKSV = 0, this field represents the Drive Error Code. The top byte of this field will

be zero. The bottom byte contains the drive error code associated with the failure of

the previous command, or zero in the case of no failure and no appropriate error

code. If the drive’s power-on self-test failed then, in the absence of an error code

associated with the most recent command, this byte will be set to the error code

generated by the failing test.

NOTE: Drive error codes are provided for information only; they are intended to

assist in product integration and fault diagnosis. The codes should not be relied on

by “generic” host drivers, since these are specific to the product. For a list of codes,

see Chapter 10 of the Hardware Integration Guide, Volume 1 of the HP

Ultrium Technical Reference Manual.

CLN

The drive is OK.

The drive requires cleaning. The front panel LEDs will be displaying a “clean

me” sequence or message. This bit is cleared to zero after a cleaning

cartridge has been used.

REQUEST SENSE 03h 151

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Descriptor format

The Descriptor format of the returned data is as follows:

Valid

Response Code

Reserved(0)

Sense Key

Additional Sense Code

Additional Sense Code Qualifier

Reserved (0)

4–6

Additional Sense Length (n–7)

(MSB)

Sense Data Descriptor 0

(LSB)

Sense Data Descriptor X

Returned Sense data fields:

Response Code

72h The error is current, that is, it is associated with the command for which

CHECK CO NDITION status has been reported.

73h The error is deferred. A deferred error occurs when there is a failure for an

operation that has already been terminated with a GOOD status, or when

failure occurs in “cleanup” activity following an operation that was

terminated by B US RE LEASE. The command for which CHECK CONDITION

status was reported is therefore unlikely to be the cause of the deferred error.

It simply gives the drive the opportunity to report CHECK CO NDITION status

for an error that already exists.

Additional Sense

Length

The number of additional sense bytes to follow, ≤244. It is never truncated to reflect

the actual Transfer Length.

Additional Sense

Additional information about the cause of the CHECK CONDITIO N, or the current

Code and Qualifier tape position when the REQUEST SENSE is unsolicited. See “Additional Sense

Codes” on page 159.

Sense Data

Descriptor

At least one descriptor is sent (Drive Error Code), the others may or may not be sent

depending on the nature of the CHECK CONDITION.

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Information Sense data descriptor

Descriptor Type (00h)

Additional Length (0Ah)

Reserved (0)

Valid (1)

Reserved (0)

Information Bytes

Sense Key Specific Sense data descriptor

Only one of these is reported: Field Pointer or Progress Indication.

Field Pointer

The Sense Key is set to Illegal Request.

Descriptor Type (02h)

Additional Length (06h)

Reserved (0)

2–3

SKSV (1)

C/ D

Reserved (0)

BPV

Bit Pointer

Field Pointer

Reserved (0)

Progress Indication

The Sense Key is set to No Sense or Not Ready.

Descriptor Type (02h)

Additional Length (06h)

Reserved (0)

2–3

SKSV (1)

Reserved (0)

Progress Indication

Reserved (0)

Process Indication The percent complete indication in which the returned value is a numerator that has

65,536 (10000h) as its denominator. The progress indication is based on the total

operation.

REQUEST SENSE 03h 153

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Stream Commands Sense data descriptor

Descriptor Type (04h)

Additional Length (02h)

Reserved (0)

2–3

Mark

EOM

ILI

Reserved (0)

Drive Error Code Sense data descriptor (Vendor Specific)

Descriptor Type (80h)

Additional Length (02h)

Reserved (0)

2–3

Mark

EOM

ILI

Reserved (0)

Drive Error Code

Cleaning Needed Sense data descriptor (Vendor Specific)

Descriptor Type (81h)

Additional Length (02h)

Reserved (0)

2–3

CLN (1)

Reserved (0)

Sense data management

The drive maintains three sets of sense data for every initiator on the bus. For a single host the

following sense data is maintained:

•

Current sense

UNIT ATTENTION sense

DEFERRED ERROR sense

Unless otherwise stated, all the following descriptions apply to the sense data for a single host

whose command is being executed.

Current sense

Current sense is the data that is returned in response to a REQUEST SENSE command. It is modified

or updated in the following circumstances:

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•

It is cleared in response to the arrival of any command other than REQUEST SENSE or

INQUIRY.

•

It is cleared following execution of a REQUEST SENSE command.

If the current command fails, sense is set according to the failure and CHECK CONDITION is

reported to the host that sent the command.

•

If the previous command terminated with an unexpected BUS FREE, current sense is set

according to the reason for the bus release.

If the command fails its pre-execution check for Unit Attention, UNIT ATTENTION sense is

copied to the Current sense, and CHECK CONDITION is reported to the host that sent the

command.

•

If the command fails its pre-execution check for Deferred Error, DEFERRED ERROR sense is

copied to the Current sense, and CHECK CONDITION is reported to the host that sent the

command.

Clearing current sense:

Clearing the Current sense involves setting sense fields as follows:

Valid = 0

error code = 0x70

segment number = 0

ILI = 0

sense key = 0

information bytes = 0

command specific information = 0

fru code = 0

SKSV = 0

UNIT ATTENTION sense

UNIT ATTENTION sense is set when one of the following Unit Attention conditions occur:

•

Power On, SCSI Reset, Bus Device Reset

Media inserted

A load command executed by a third party

Mode Sense parameters changed by another initiator

Drive firmware has been updated

UNIT ATTENTION sense will persist for a host until the host sends a command that has Unit

Attention as part of its pre-execution checks. When the Unit Attention pre-execution check fails, the

UNIT ATTENTION sense is copied to the Current sense and CHECK CONDITION status is reported to

the host. The UNIT ATTENTION sense is cleared. The host is then expected to issue a REQUEST

SENSE command to recover the UNIT ATTENTION sense (which is now the new Current sense).

REQUEST SENSE 03h 155

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It is possible for multiple UNIT ATTENTION conditions to arise (for example, after a power-on

followed by a tape load), such that the initiator does not read one condition before the next

occurs. In this case a prioritizing scheme is used. If a UNIT ATTENTION condition exists and a new

one occurs, then the UNIT ATTENTION sense will be overwritten by the new sense only if the new

sense has a higher priority.

The order of priority is as follows:

Power-on, Reset

Tape Loaded

Mode Parameters Changed

Microcode Downloaded

highest priority

lowest priority

UNIT ATTENTION sense that arises as a result of a command executing will not be posted to the

sending initiator, but will be set for the other initiators.

DEFERRED ERROR sense

DEFERRED ERROR sense is generated when an operation fails and CHECK CONDITION status

cannot be reported to the host for one of the following reasons:

•

The operation had immediate-report on (for example, REW IND with the Immed bit set, or

LOAD).

The operation was a write that was immediate-reported on after its data was successfully

placed in the write-behind queue.

The operation was abandoned without status (that is, a bus release occurred) after what the

drive perceived was a catastrophic error or when an error occurred following the drive’s

honoring of an ABORT message. Following the bus release, the drive performed “cleanup”

activity that failed. The Deferred Error refers to the reason for this failure.

When any one of the above occurs, the sense generated will be DEFERRED ERROR sense. This sense

persists until the host sends a command that has Unit Attention as part of its pre-execution checks.

When the Deferred Error pre-execution check fails, the DEFERRED ERROR sense is moved to the

Current sense and CHECK CONDITION status is reported to the host. The host is then expected to

issue a REQUEST SENSE command to recover the new Current sense data, otherwise the data will

be lost.

Write-behind deferred errors:

If the Buffered Mode field of the MODE SELECT parameter header is not zero, data buffering is

enabled. If an error occurs in flushing the write-behind data, DEFERRED ERROR sense is set for all

hosts that the drive thinks have write-behind data in the buffer. For each of these hosts, the

following occurs when its next command is to be executed:

•

If the command is WRITE or WRITE FILEMARKS the DEFERRED ERROR sense is copied to

Current sense and the error is changed to a Current error (the Error Code field is set to

70h). The information bytes will contain residue information reflecting the size of the write-

behind queue plus the transfer size of the current command. CHECK CONDITION is

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reported. When the host reads sense data with a REQUEST SENSE, it will see an error for the

WRITE with residue information indicating data lost for that write and previous writes.

•

If the command is not a write command and the Deferred Error check is performed as part

of the pre-execution checks, CHECK CONDITION status is reported. The DEFERRED ERROR

sense is copied to Current sense. The DEFERRED ERROR sense is cleared. The host is

expected to retrieve the sense by sending a REQUEST SENSE, otherwise the data will be lost.

Bus release deferred errors:

The drive will release the bus to terminate an operation (such as READ) when the host sends an

ABORT message or when the drive fails to send status due to a catastrophic error.

In each case, the operation does not terminate immediately since the logical position will have to

be established on the other side of the block that was about to be transferred, or was being

transferred. If an error subsequently occurs while trying to complete the read, the sense generated

is a DEFERRED ERROR. It is therefore possible but highly unlikely to have DEFERRED ERROR sense

flagged for a command without immediate report.

Sense keys

The following table lists the sense keys that may be returned by HP Ultrium drives. SCSI sense keys

are 4-bit codes returned in the sense data. They indicate in what general area the problem that

has just been experienced falls. For a clearer indication of the nature of the problem, refer to the

additional sense code.

Code Name

Description

ASC/ Qs

0h NO SENSE

There is no real problem. The sense information is

probably indicating some condition (such as

encountering a filemark).

0000h, 0001h, 0002h,

8282h

1h RECOVERED ERROR Returned if a Mode Select parameter is truncated

5D00h, 3700h

or if a TapeAlert event is being reported.

2h NOT READY

The drive is not in a state to be able to execute

the request. See also the Media Access check.

0400h, 0401h, 0402h,

3003h, 3007h, 3A00h,

3E00h

3h MEDIUM ERROR

The command failed, believed to be caused by a 0002h, 0004h, 0407h,

problem with the tape.

0410h, 0C00h, 1100h,

1102h, 1400h, 3001h,

3002h, 3004h, 3100h,

3B00h, 5000h, 5200h,

5300h

4h HARDWARE ERROR The command failed, believed to be caused by a

problem with the drive hardware.The FRU in the 0403h, 40XXh, 4400h,

sense data should indicate which part of the

hardware is faulty.

5100h, 5300h

REQUEST SENSE 03h 157

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Code Name

Description

ASC/ Qs

5h ILLEGAL REQUEST

The last command sent to the drive or the data

associated with the command violated conditions

imposed by the drive on its acceptance. See also

the Illegal Command, Illegal Field, Fixed Bit,

Reservation and Parameter List pre-execution

checks.

1A00h, 2000h, 2400h,

2500h, 2600h, 2601h,

5302h, 8283h

6h UNIT ATTENTION

7h DATA PROTECT

8h BLANK CHECK

Indicates some condition of which the host needs

to be made aware. See also the Unit Attention

check.

2800h, 290Xh, 2A01h,

3F01h, 5DFFh

A request has been made to modify the media

despite the media being write-protected. See also

the Media Write check.

2700h, 3000h

0005h, 1403h

The drive tried to read unwritten tape.

9h VENDOR SPECIFIC Never returned by HP tape drives

Ah COPY ABORTED

Never returned by HP tape drives

Bh ABORTED

The drive has stopped trying to act on a

3D00h, 4300h, 4500h,

COMMAND

command, usually through some problem on the 4700h, 4800h, 4900h,

SCSI bus.

4A00h, 4B00h, 4E00h

Ch EQUAL

Never returned by HP tape drives

Dh VOLUME

Data could not be written due to lack of

remaining space on the tape. See the WRITE and

WRITE FILEMARKS commands.

OVERFLOW

0002h

Eh MISCOMPARE

Fh RESERVED

Never returned by HP tape drives

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Additional Sense codes

This section contains a list of all the additional sense codes that an HP Ultrium drive can return, in

numerical order. The Sense Keys under which each code could appear are also listed. The ASCQ

bytes are present at bytes 12 and 13 of the sense data.

Code Description

Explanation

00 00h No additional sense

The flags in the sense data indicate the reason for

command failure.

00 01h Filemark detected

A Read or a Space command terminated early because a

filemark has been encountered. The File Mark flag will be

set.

00 02h End of Tape detected

A Write or a Write Filemarks command ended in the early

warning area.

A command terminated early because End of Tape or

physical end of tape was encountered. The EOM flag will

be set.

00 04h Beginning of Tape detected

00 05h End of Data detected

A Space command terminated early because beginning of

tape was encountered. The EOM flag will be set.

A Read or a Space command terminated early because

End of Data was encountered.

00 16h Operation in progress

00 18h Erase operation in progress

00 19h Locate operation in progress

00 1Ah Rewind operation in progress

04 00h LUN not ready, cause not

reportable

An immediate mode command is in progress

An immediate mode ERASE is still in progress

An immediate mode LOCATE is still in progress

An immediate mode REWIND is still in progress

A tape is present in the drive but is in the process of being

unloaded.

04 01h LUN in process of becoming ready A medium access command has been received during a

load initiated from the front panel or by an immediate-

reported Load command

04 02h LUN not ready, Initializing

A tape is present in the drive but is not logically loaded. A

command required

Load command is required.

04 03h LUN not ready, manual intervention A tape is present in the drive but could not be loaded or

required

unloaded without manual intervention.

The tape drive is currently executing an immediate mode

command.

04 07h Immediate mode command in

progress

04 10h Media Auxiliary Memory is not

accessible

MAM is not accessible.

0C 00h Write error

A Write operation has failed. This is probably due to bad

media but may be hardware related.

0C 0Bh Media Auxiliary Memory write

error

An error has occurred while attempting to write to MAM.

11 00h Unrecovered read error

A Read operation failed. This is probably due to bad

media but may be hardware related.

11 12h Media Auxiliary Memory read errorThe Host Attribute area in MAM is invalid.

14 00h Recorded entity not found

A Space or Locate failed because a format violation

prevented the target of the operation from being found.

REQUEST SENSE 03h 159

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Code Description

Explanation

14 03h End of data not found

A read-type operation failed because a format violation

related to a missing EOD data set, or there was an attempt

to read a brand new tape.

1A 00h Parameter list length error

The amount of data sent in a Mode Select or Log Select

command is incorrect

The Mode Header indicates a Mode Block Descriptor but

no Mode Block Descriptor is sent.

20 00h Invalid command operation code The operation code in the command was not valid.

24 00h Invalid field in Command

Descriptor Block

An invalid field has been detected in a Command

Descriptor Block.

25 00h LUN not supported

The command was addressed to a non-existent logical unit

number.

26 00h Invalid field in parameter list

26 01h Parameter not supported

An invalid field has been detected in the data sent during

the data phase

The command was addressed to a non-existent logical unit

number.

26 04h Invalid release of persistent

The Persistent Reservation holder has tried to release the

persistent reservation using the PERSISTENT RESERVE OUT

command, but the Scope or Type supplied was invalid.

A write-type operation has been requested on a tape that

has been write-protected.

reservation

27 00h Write-protected

28 00h Not ready to ready transition,

medium may have changed

29 01h Power-on reset

A tape has been loaded successfully into the drive and is

now ready to be accessed.

The drive has powered on since the host last accessed it.

SCSI drives: The drive has received a SCSI reset signal

since the host last accessed it.

29 02h SCSI bus reset

FC drives: The drive has received its first process login. The

drive will be implicitly logged out after a Target Reset so

this ASCQ will be posted after the host has performed

port/ process login.

29 03h Bus device reset

SCSI drives: The drive has received a SCSI bus device reset

message since the host last accessed it.

FC drives: The drive has received a process login when it

was previously logged in for a particular host.

The drive has reset itself.

SCSI drives: The transceivers on the bus have been reset to

Single-Ended.

29 04h Internal firmware reboot

29 05h Transceivers to SE

29 06h Transceivers to LVD

SCSI drives: The transceivers on the bus have been reset to

LVD.

2A 01h Mode parameters changed

2A 02h Log parameters changed

2A 03h Reservations pre-empted

The Mode parameters for the drive have been changed by

an initiator other than the one issuing the command.

The Log parameters for the drive have been changed by

an initiator other than the one issuing the command.

A PERSISTENT RESERVE OUT command with the Clear

service action was attempted. All reservations and the

persistent reservation have been removed.

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Code Description

Explanation

2A 04h Reservations released

The original persistent reservation has been replaced with

another of a different type or removed completely.

A PERSISTENT RESERVE OUT command was executed and

all registrations removed.

The use of the echo buffer was invalid. A WRITE BUFFER

command is necessary before a READ BUFFER command.

A write-type operation could not be executed because it is

not supported on the type of tape that is loaded.

An operation could not be carried out because the tape in

the drive is of a format not supported by the drive.

2A 05h Registrations pre-empted

2C 00h Command sequence invalid

30 00h Incompatible medium installed

30 01h Unknown format

30 02h Cannot read media: incompatible An operation could not be completed because the logical

format

format is not correct.

30 03h Cleaning cartridge installed

An operation could not be carried out because the tape in

the drive is a cleaning cartridge.

30 04h Cannot write medium

An attempt was made to write to a cartridge that has

Cartridge Memory errors.

30 05h Cannot write medium, incompatible For example, the drive tried to write to a tape of an

format

incompatible generation.

30 07h Cleaning failure

A cleaning operation was attempted but could not be

completed for some reason.

30 0Ch WORM—overwrite attempted

A write operation could not be executed because an

overwrite has been attempted on a WORM cartridge. This

may be because an overwrite backup was specified

instead of an appended backup.

30 0Dh WORM medium—integrity check The drive has detected an inconsistency when performing

failed

an integrity check on a WORM cartridge. The cartridge

may have been tampered with.

31 00h Medium format corrupted

35 01h Unsupported enclosure function

35 02h Enclosure services unavailable

37 00h Rounded parameter

Data could not be read because the format on tape is not

valid, although it is in a known format.

The drive cannot respond to this Enclosure Services

request.

No compatible enclosure hardware has been detected by

the drive.

A Mode Select command parameter has been rounded

because the drive cannot store it with the accuracy of the

command.

3A 00h Medium not present

A media -access command has been received when there

is no tape loaded.

3A 04h Medium not present, Media

A media access command has been received when the

tape has been loaded but not threaded. This will be

reported if the hold bit of the LOAD CDB was set or the

Autoload field in the Control mode page is non zero.

A command has failed and left the logical position at an

unexpected location.

A SET CAPACITY command was received when the logical

position was not BOT, a necessary condition for this

command.

Auxiliary Memory accessible

3B 00h Sequential positioning error

3B 0Ch Position past BOM

3D 00h Invalid bits in Identify message

An illegal Identify message has been received by the drive

at the start of a command.

REQUEST SENSE 03h 161

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Code Description

Explanation

3E 00h Logical unit has not self-configured The drive has just powered on and has not completed its

yet

self-test sequence, so it cannot process commands.

The firmware in the drive has just been changed by a Write

Buffer command.

3F 01h Firmware upgraded

3F 05h Device identifier changed

3F 0Fh Echo buffer overrun

The Device ID has been changed successfully.

A Read Buffer command has been received with Echo

Buffer mode set, and the echo buffer has been overwritten

by a different host from that which issued the Read Buffer

command.

3F 11h Media Auxiliary Memory

accessible

MAM is accessible but the cartridge is in the Hold

position. Unit Attention is generated.

40 XXh Diagnostic failure on

component XX

A diagnostic test has failed. The Additional Sense Code

Qualifier is a vendor-specific code indicating the failing

component.

43 00h Message error

A message could not be sent or received because of

excessive transmission errors.

44 00h Internal target failure

45 00h Select or reselect failure

47 00h SCSI parity error

A hardware failure has been detected in the drive that has

caused the command to fail.

An attempt to reselect an initiator in order to complete the

command has failed.

A command failed because of an excessive number of

parity errors on the SCSI interface.

47 01h Data phase CRC error detected

For parallel SCSI only in non-Information Units mode, the

drive has detected a CRC error during the data out phase.

47 03h Information Unit CRC error detectedFor parallel SCSI only in Information Units mode, the drive

has detected a CRC error during the command IU or data

out phase.

48 00h Initiator Detected Error message

received

A command failed because an Initiator Detected Error

message was received.

49 00h Invalid message error

The command failed because an invalid message was

received by the drive.

4A 00h Command phase error

4B 00h Data phase error

4B 90h Data phase error

A command could not be executed because too many

parity errors occurred in the command phase

A command could not be completed because too many

errors occurred during the data phase.

FCL_DL to CDB Allocation Length mis-match.

4E 00h Overlapped commands attempted An initiator selected the drive even though it already had a

command outstanding.

50 00h Write append error

51 00h Erase failure

A write-type command failed because the point at which to

append data was unreadable.

An erase command failed to erase the required area on

the tape.

52 00h Cartridge fault

A command could not be completed because of a fault in

the tape cartridge.

53 00h Media load or eject failed

53 02h Medium removal prevented

55 03h Insufficient resources

An attempt to load or eject the tape failed because of a

problem with the tape.

An Unload command has failed to eject the tape because

medium removal has been prevented.

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Code Description

Explanation

55 04h Insufficient registration resources

FC interface only: There is only space for requests from

32 initiators to register, using PERSISTENT RESERVE OUT

commands.

55 06h Media Auxiliary Memory full

There is insufficient space in the Host Attribute area in

MAM to fit the attribute that need to be written.

Failure Prediction thresholds have been exceeded

indicating that a failure may occur soon.

A Mode Select command has been used to test for the

Failure Prediction system.

5D 00h Failure prediction threshold

exceeded

5D FFh Failure prediction threshold

exceeded (false)

82 82h Drive requires cleaning

The drive has detected that a cleaning operation is

advisable to maintain good operation.

The data transferred to the drive during a firmware

upgrade is corrupt or incompatible with the drive

hardware.

82 83h Bad microcode detected

Error codes

The error codes that can be reported in bytes 16 and 17 are listed in Chapter 10 of the Hardware

Integration Guide, Volume 1 of the HP Ultrium Technical Reference Manual.

REQUEST SENSE 03h 163

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RESERVE UNIT

16h/ 56h

This command enables the host to reserve the drive. Reserving a device is a way of ensuring

exclusive access to that device from a single initiator for the period of the reservation.

Once reserved, the drive will execute commands received from the reserving initiator or from the

third-party initiator if the 3rd-Pty option has been selected. Commands from other initiators will

have RESERVATION CONFLICT status reported for them, apart from INQUIRY, REQUEST SENSE, LOG

SENSE, REPORT LUNS, REPORT DENSITY SUPPORT, READ BLOCK LIMITS and RELEASE UNIT.

The INQUIRY, REQUEST SENSE, LOG SENSE, PREVENT/ ALLOW MEDIUM REMOVAL (Allow=0), REPORT

LUNS, READ BLOCK LIMITS and REPORT DENSITY SUPPORT commands are immune to the effects of a

reservation and will continue to execute for all hosts. The RELEASE UNIT command will have GOOD

status reported for other hosts, but will have no effect on the reservation.

The reservation will stay in effect until:

•

The reserving host sends another RESERVE UNIT command.

The reserving host sends a RELEASE UNIT command, clearing the reservation.

A power-on, firmware upgrade or forced eject.

Pre-execution checks:

Illegal Field

Deferred Error

Unit Attention

If the drive is reserved by some other host then reservation conflict status is reported to the host.

Command descriptor block:

6-byte

Operation Code (16h)

3rd Pty(0) Third-Party Device ID (0)

Reserved (0)

Rsvd(0)

Reserved (0)

Control

3rdPty

This is always zero because third-party reservation is not supported.

Third-Party Device ID

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10-byte

Operation Code (56h)

3rd Pty Reserved (0)

Reserved (0)

LongID(0) Rsvd(0)

Third-Party Device ID

Reserved (0)

(MSB)

Parameter List Length

Control

(LSB)

RESERVE UNIT 16h/ 56h 165

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REWIND

01h

REWIND causes the drive to write all buffered logical objects to tape and then positions the tape at

BOM (beginning of media). Once a rewind is started, it will complete even if the SCSI operation is

aborted (for example, if the host selects and sends an abort message).

Pre-execution checks:

Illegal Field

Reservation

Deferred Error

Unit Attention

Media Access

Diagnostic Status

Command descriptor block:

Operation Code (01h)

Reserved (0)

Immed

Reserved (0)

Control

CDB fields:

Immed

Status is returned after the rewind has completed.

The drive first writes any unwritten buffered data to tape. It then returns GOOD status to

the host before beginning the actual rewind operation.

Rewind specific status:

If the rewind is successful, unsolicited positional sense will indicate that the tape is at BOM by the

EOD bit being set and an additional sense code of 0004h (BOP).

166 Commands

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SEEK(CD-ROM mode)

2Bh

SEEK is executed for 2Bh when the drive is in CD-ROM mode. When out of CD-ROM, the LOCATE

command, which shares the opcode, is executed.

Assuming the pre-execution checks are passed, GOOD status is always reported.

Pre-execution checks:

Illegal Field

Flag Link

Bad LUN

Reservation

Deferred Error

Unit Attention

Media Access

Diagnostic Status

Command descriptor block:

Operation Code (2Bh)

Logical Unit Number

Reserved (0)

(MSB)

Logical Block Address

(LSB)

6–8

Reserved (0)

Control

CDB fields:

Logical Block Address This field is ignored.

SEEK (CD-ROM mode) 2Bh 167

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SEND DIAGNOSTIC

1Dh

SEND DIAGNOSTIC tells the drive to perform either its standard self-test, or diagnostics specified in

the parameter list on itself. The parameter list is transferred to the drive in a series of data-out

phases; each 8-byte data-out phase specifies a diagnostic to be performed by the drive. It is not

an error to set Self-Test = 0 and to have a zero-length parameter list.

The test results can be retrieved with the RECEIVE DIAGNOSTIC RESULTS command.

Pre-execution checks:

Illegal Field

Reservation

Deferred Error

Unit Attention

•

If Self-Test = 0, the UntOffl bit must be set, otherwise CHECK CONDITION is reported. Sense

data will be as described in Illegal Field Checks.

If Self-Test = 1, the Parameter List Length field must be zero. Otherwise CHECK CONDITION is

reported. Sense data will be as described in Illegal Field Checks.

It is not an error to set Self-Test = 0 and to have a zero-length parameter list.

Command descriptor block:

Operation Code (1Dh)

PF (1) Rsvd(0) Self-Test DevOffL(0) UnitOffL

Reserved (0)

Parameter List Length

Control

(MSB)

(LSB)

CDB fields:

Page Format. Specifies that the accompanying data follows the SCSI-3 Diagnostic Page

format. It must be set to 1.

Self-Test

Perform the diagnostics specified in the parameter list. The UnitOffL bit must be

set, otherwise CHECK CONDITION is reported. The drive reports status when the

command has been completed.

Perform the standard self-test depending on the value of UnitOffL (see above).

The Parameter List Length must be 0 otherwise CHECK CONDITION is reported.

The drive will report GOOD status following the pre-execution checks and before

executing the command.

DevOffl

Device Offline bit. Must be cleared to zero.

UnitOffL

Unit Offline bit

Indicates that the host is not prepared for the drive to perform tests that could

affect logical position.

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Indicates that the host is prepared for the drive to perform tests that could affect

logical position, modify the tape or modify cartridge status. This bit must be set if

the Self-Test bit is 0.

Parameter List

Length

Indicates how many bytes of diagnostic parameter data are to be sent to the

drive. The length of the data phase for SEND DIAGNOSTIC is limited to 4 bytes of

header plus 34 parameters, each of which is 4 bytes long. This gives an upper

limit for the parameter list length of 136 bytes.

Data required

No data is required if the standard self-test is to be performed. Otherwise, a single diagnostic

page must be provided as a parameter.

Specific status

Any Send Diagnostic command received with a Enclosure Services page number (01h to 0Fh) will

generate CHECK CONDITION with sense key of ILLEGAL REQUEST and additional sense of 3501h

(unsupported enclosure function).

The drive reports GOOD status if the diagnostics pass. It will report CHECK CONDITION if the

diagnostics fail, with a sense key of HARDWARE ERROR and additional sense of 4000h.

More detailed results can then be recovered using the Receive Diagnostic Results page.

Standard self-test

With a tape inserted:

If Self-Test = 1 and UntOffl = 0, a test is performed that does not affect the

contents of the tape. This test is a more extensive set of the tests carried out

at power-on.

If UntOffl = 1, the tape contents can be overwritten and will be undefined

after the test. A user can re-use the tape after the test.

With no tape in the drive: The same self-test will be executed regardless of the setting of UntOffl.

The results of any self-test (power on or not) can be determined by reading

the Self-Test diagnostic page before executing a diagnostic (which will

overwrite the result).

SEND DIAGNOSTIC 1Dh 169

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SET CAPACITY

0Bh

This provides a means of changing the logical length of the currently-loaded media. The primary

use envisaged is for testing purposes, although it may also be used in other circumstances where a

shortened tape may be beneficial.

Note that all data currently on the media will be lost following successful execution of this

command. The command is only accepted when the media is positioned at Beginning of Media

(BOM).

With WORM cartridges, the command is only accepted and executed if the cartridge has not

been initialized, that is, it has never been written to. Otherwise the cartridge is rejected with

CHECK CONDITION, sense key of Data Protect and additional sense of 300Ch (WORM media—

overwrite attempted). TapeAlert flags 3Ch (WORM media—overwrite attempted) and 09h (write-

protect) are set.

Pre-execution checks:

Illegal Field

Reservation

Deferred Error

Media Write

Unit Attention

Media Access

Command descriptor block:

Operation Code (0Bh)

Reserved (0)

Immed

Reserved (0)

(MSB)

Capacity Proportion Value

Control

(LSB)

CDB fields:

Immed

Status will not be returned until the SET CAPACITY operation has completed.

Status will be returned as soon as the CDB has been parsed.

Capacity

Proportion Value

The portion of the total volume capacity to be made available for use. The value

given here is the numerator of a fraction with a denominator of 65,535. The

total volume capacity × capacity proportion value

----------------------------------------------------------------------------------------------------------------------

resulting available capacity will be

65535

Note that the LTO-3 format enforces a minimum tape length. A value that would

result in a tape length below this minimum will be silently rounded up to the

minimum permitted length.

170 Commands

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SET DEVICE IDENTIFIER

A4h

SET DEVICE IDENTIFIER allows a initiator to set the Device ID information to that supplied in the

Parameter List. This information can be later retrieved by the REPORT DEVICE IDENTIFIER command.

Upon successful completion the command will post sense key UNIT ATTENTION with additional

sense of 3F05h (device identifier changed) to all initiators except the one that issued the

command. Once set the Device Identifier will only be cleared by a successful Set Device Identifier

command or a drive reset.

Pre-execution checks:

Illegal Field

Reservation

Deferred Error

Unit Attention

Command descriptor block:

Operation Code (A4h)

Reserved (0)

Service Action (06h)

2–5

Reserved (0)

(MSB)

Parameter List Length

(LSB)

Reserved (0)

Control

CDB fields:

Service Action

Must be 06h

Parameter List Length The length in bytes of the Device Identifier to be set. If the value exceeds 64,

CHECK CONDITION is returned with additional sense of 2400h (invalid field in

CDB).

0 Not an error, but clears any previously stored Device ID.

Data

The format of the Device Identifier supplied in the Parameter List is as follows:

(MSB)

Identifier

(LSB)

SET DEVICE IDENTIFIER A4h 171

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SPACE

11h

SPACE provides a variety of positioning functions that are determined by Code and Count fields in

the Command Descriptor Block. Both forward (towards EOM) and reverse (towards BOM)

positioning are provided.

Any unwritten data in the buffer is flushed to tape before the space is started. The logical media

position is then modified according to the Code and Count fields. Once the space has started, it

will complete even if the SCSI operation is aborted for some reason (for example, the host selects

and sends an abort message).

Pre-execution checks:

Illegal Field

Reservation

Deferred Error

Unit Attention

Media Access

Diagnostic Status

The Code field must be 0, 1 or 3. If it is not then CHECK CONDITION status is reported. Sense data

will be as described in the Illegal Field Checks.

Command descriptor block:

6 -byte version

Operation Code (11h)

Reserved (0)

Code

(MSB)

Count (n)

(LSB)

Control

16-byte version

Operation Code (91h)

Reserved (0)

Code

2–3

Reserved (0)

(MSB)

Count (n)

(LSB)

Parameter Length

Reserved (0)

Control

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CDB fields:

Code

The Code field indicates what is to be spaced to:

000 Blocks—The number of blocks crossed is dictated by Count.

001 Filemarks—The number of filemarks crossed is dictated by Count.

011 EOD—Space to the end of data in the current active partition.

Count

•

When spacing over blocks or filemarks this field indicates how many blocks or

marks should be crossed. Spacing is forward (towards EOM) unless Count is

negative (twos complement) when the spacing is towards BOM.

•

When spacing to EOD the Count field is ignored.

When not spacing to EOD, if Count is zero, the SPACE command is treated as a

null operation. The logical position remains unchanged, and unwritten data is not

flushed to tape.

Parameter Length

Explicit block mode is not supported.

Space specific status:

If the drive fails to space either from a medium error or from some sort of non-fatal drive error,

CHECK CONDITION status is reported. The sense key will be set to MEDIUM ERROR. Additional

sense depends on the nature of the error. The two most common additional sense code and

qualifiers in this case will be: 1100h (unrecovered read error) and 3B00h (sequential positioning

error).

The drive implements the following priority scheme when a tape position point is encountered:

Lowest priority Blocks

Filemarks If the drive meets a filemark while spacing to a block CHECK CO NDITIO N is

reported. The Mark bit in the sense data is set, and the sense key is NO

SENSE. Additional sense is 0001h (filemark encountered). The final

position will be before or after the filemark depending on whether the

space was reverse or forward.

EOD

If the drive meets EOD while spacing to a block or mark, CHECK

CO NDITION is reported. The EOM bit in the sense data is set. The sense

key is BLANK CHECK and additional sense is 0005h (EOD encountered).

BOM

If the drive meets BOM while spacing, CHECK CO NDITION is reported. The

EOM bit and Valid bit in the sense data are set to 1 and the information

bytes set to the total number of blocks or filemarks that remain to be

spaced over (in other words, the requested number minus the number that

have been spaced over). The sense key is NO SENSE and additional sense

is 0004h (BOT detected).

Highest priority EOM

If the drive meets EOM while spacing, CHECK CO NDITIO N is reported. The

EOM bit in the sense data is set. The sense key is MEDIUM ERRO R and

additional sense is 0002h (EOP/ M detected).

•

If “blank media” is encountered during a space (in other words, the drive attempted to

space on an unformatted tape), the drive behaves as if EOD was at BOM. It will then

SPACE 11h 173

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respond with GOOD status to a request to space to EOD, and with CHECK CONDITION to

any other forward spacing request. Additional sense is set to 1403h (End of data not found).

•

Early warning end of medium information is not reported.

If a space records or space filemarks command fails then the sense data information bytes

will be set to the absolute value of the difference between the requested number of marks/

records and the actual number of marks/ records spaced over and the Valid bit set. The

residue for a prematurely terminated Space towards BOM will always be a positive value.

NOTE: This value will only be accurate if the sense key is NO SENSE.

•

If the format of the data on tape is corrupt then CHECK CONDITION status is reported. The

sense key will be set to MEDIUM ERROR. Additional sense will be set to 3001h (unknown

format).

If the drive fails to read data from tape due to either a MEDIUM ERROR or some sort of non

fatal drive error then CHECK CONDITION status is reported. The sense key will be set to

HARDWARE ERROR Additional sense will be set to 3B00h (sequential positioning error).

174 Commands

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START/ STOP

(CD-ROM mode)

1Bh

START/ STOP is executed for 1Bh when the drive is in CD-ROM mode. When out of CD-ROM

mode, the LOAD/ UNLOAD command, which shares the opcode, is executed.

Assuming that the pre-execution checks are passed, GOOD status is always reported.

Pre-execution checks:

Illegal Field

Flag Link

Bad LUN

Reservation

Deferred Error

Unit Attention

Command descriptor block:

Operation Code (1Bh)

Logical Unit Number

Reserved (0)

Immed

LoEj

Start

Control

CDB fields:

Immed

LoEj

This flag is ignored.

Load/ Eject. This flag is ignored.

This flag is ignored.

Start

START/ STOP (CD-ROM mode) 1Bh 175

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TEST UNIT READY

00h

TEST UNIT READY checks if the drive is ready for commands that access the tape. This is done by

the pre-execution Media Access check; it is not a request for a self-test. If the drive has a tape

loaded, the command returns a GOOD status. Otherwise, CHECK CONDITION is reported and the

sense key is NOT READY.

Pre-execution checks:

Illegal Field

Reservation

Deferred Error

Unit Attention

Media Access

Media Information

Command descriptor block:

Operation Code (00h)

Reserved (0)

Control

Test Unit Ready specific status:

If all the pre-execution checks pass, GOOD status is reported.

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VERIFY

13h

VERIFY verifies one or more blocks beginning with the next block on the tape. The verification is

media verification only. It reads data from the tape as it would for a read but then immediately

discards it. No data is transferred between the host and drive.

The command is identical to the READ command in most respects. The pre-execution checks are

identical. Sense data reporting on errors/ exceptions is identical. The only differences are:

•

No data phases occur during verification.

The Verify command has no SILI bit. When an illegal length record is encountered, Verify

behaves like READ with the SILI bit clear.

NOTE: Verify will not complete until all data has been read. It does support the ANSI “byte

compare” or “Immed” options (see the ANSI SCSI specification).

Pre-execution checks:

Illegal Field

Fixed Bit

Reservation

Deferred Error

Unit Attention

Media Access

Diagnostic Status

Command descriptor block:

Operation Code (13h)

Reserved (0)

Immed(0) BCmp(0)

Fixed

(MSB)

Verification Length

Control

(LSB)

CDB fields:

Immed

BCmp

Fixed

The Immediate Reporting option is not supported, so this bit must be 0.

The Byte compare option is not supported, so this bit must be 0.

The Verification Length field specifies the length of the data to be verified in bytes.

The Verification field specifies the length of the data to be verified in blocks. The size

of each block (in bytes) is specified by the current block length specified in the Mode

Parameter block descriptor.

Verification

Length

No data is verified. This is not considered an error and the current logical position

will be unchanged.

>0 The amount of data to be verified, in bytes or blocks as specified by the Fixed field.

VERIFY 13h 177

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WRITE

0Ah

Zero or more blocks of data are transferred from the host to tape starting at the current logical

position.

It is recommended that the Buffered Mode field of the MODE SELECT Parameter is set to either 1 or

2 so that Immediate reporting is enabled; upon a write command the drive will report GOOD

status once the data is successfully transferred to the data buffer (but not necessarily to tape).

Data held in the buffer is flushed to tape in the following circumstances:

•

A SCSI command is received that forces a flush:

ERASE

LOAD

LOCATE

SPACE

LOG SELECT

VERIFY

MODE SELECT

W RITE BUFFER

READ

REW IND

SEND DIAGNOSTIC

•

Buffered mode is not enabled. If buffered mode has not been set to 1 or 2, the buffer is

flushed before the command completes.

The write delay time is exceeded. This is defined by the Write Delay field of the Device

Configuration Mode Select page. If the drive is idle for longer than this (no operations that

access the tape have been performed), any data in the buffer is flushed to tape.

Pre-execution checks:

Illegal Field

Fixed Bit

Reservation

Deferred Error

Unit Attention

Media Access

Media Write

Diagnostic Status

Command descriptor block:

Operation Code (0Ah)

Reserved (0)

Fixed

(MSB)

Transfer Length

Control

(LSB)

CDB fields:

Fixed

The Transfer Length field specifies the length of the transfer in bytes.

The Transfer Length field specifies the length of the transfer in blocks. The size of each

block (in bytes) is determined by the current Block Length given in the Mode Select

Parameter block descriptor.

Transfer

Length

No data is transferred. The current logical position will be unchanged.

>0 The amount of data to be transferred, in bytes or blocks as determined by the Fixed field.

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Write specific status:

See also the “Additional Sense codes” on page 159 for a variety of possible hard errors.

An attempt to write to a write-protected cartridge will produce a CHECK CONDITION with a sense

key of DATA PROTECT and additional sense of 2700h (write-protected).

An attempt to write to a cartridge whose Cartridge Memory has failed will produce a CHECK

CONDITION with a sense key of MEDIUM ERROR and additional sense of 3004h (cannot write

medium). If, however, the tape is not positioned at BOT, the drive will respond with sense data as

if the tape is write-protected. The WP flag in the Mode Parameter Header will also be set.

If EOM (end of medium) is encountered during a write, CHECK CONDITION status is reported. The

EOM flag will be set. The sense key will be set to VOLUME OVERFLOW with additional sense of

0002h (EOT). Residue information will be as below. The logical position will be EOD.

Subsequent Request Sense commands will, however, give tape position as EOP/ M. It may still be

possible to write a smaller quantity of information (such as filemarks or a smaller block). This is

because logical position after failure to write a block returns to the start of the unwritten block.

Early Warning EOM information is reported only if a write operation is successful. This is done by

reporting CHECK CONDITION status with a sense key of NO SENSE and additional sense of 0002h

(EOT). Residue information is valid and indicates zero blocks/ bytes.

Residue information:

Residue information depends on two variables:

•

Fixed or Variable block mode.

Immediate or Non-Immediate Report (Buffered mode).

Block Mode

Variable

Fixed

Buffered Mode Residue

Number of unwritten bytes

Number of unwritten blocks

Variable

not 0

Total number of unwritten bytes and marks (including those buffered

before the command was received). The size can be greater than the

command operation size.

specifically 1

not 0

Contains residues of all initiators with data in the buffer.

Fixed

Total number of unwritten blocks and marks (including those buffered

before the command was received). The size can be greater than the

command operation size.

specifically 1

Contains residues of all initiators with data in the buffer.

Residue information is set in the sense data byte, with the Valid bit set and the information bytes

set to the residue.

WRITE 0Ah 179

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WRITE ATTRIBUTE

8Dh

The WRITE ATTRIBUTE command allows an application client to write attribute values to MAM

(Medium Auxiliary Memory). Application clients should issue READ ATTRIBUTE commands before

using this command to discover what support the device server has for MAM.

Pre-execution checks:

Illegal Field

Deferred Error

Unit Attention

Media Access

For this command to be executed, there must be a tape in the drive, even if it is only partially

loaded.

Command descriptor block:

Operation Code (8Dh)

Reserved (0)

Volume Number (0)

Reserved (0)

Partition Number (0)

Reserved (0)

(MSB)

Parameter List Length

(LSB)

Reserved (0)

Control

CDB fields:

Volume

Number

The number of the volume within the MAM. The number of volumes of the MAM must be

equal to that of the tape. In the case of Ultrium, the only has a single volume, so this field

is be set to 0.

Partition

Number

The number of the partition within the MAM. The number of partitions of the MAM must

be equal to that of the tape. In the case of Ultrium, the only has a single partition, so this

field is be set to 0.

Parameter List The length in bytes of the parameter list contained in the Data -Out buffer.

Length

The Data -Out buffer is empty. This condition is not be considered an error.

The length in bytes of the parameter list contained in the Data -Out buffer.

180 Commands

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Parameter list format:

The parameter list has the following format. The attributes should be sent in ascending

numerical order. For details of attribute data see “MAM attribute data” on page 115.

(MSB)

Parameter Data Length (n−3)

(LSB)

Attribute 1

Attribute x

Parameter

Data Length

This is not mandatory and will be ignored by the device server because it duplicates the

Parameter List Length.

If the parameter data contains an attribute with an Attribute Length of zero, one of the following

actions will occur:

•

If the attribute is read-only or unsupported, no attributes are changes. The command fails,

returning CHECK CONDITION with ILLEGAL REQUEST sense and additional sense of 2600h

(invalid field in parameter list).

•

If the attribute can be written to, it is deleted and will not be returned after a subsequent

READ ATTRIBUTE command.

If the attribute does not exist, the command cannot affect it. This is not considered an error.

Write Attribute specific status:

The command will be terminated and will return CHECK CONDITION under the following

circumstances:

Description

Sense Key

Additional Sense

There is no cartridge present in the drive, not even

partially loaded.

NOT READY

3A00h (medium not present)

The MAM is not accessible even though there is a tape MEDIUM

0410h (MAM not

accessible)

in the drive. None of the attributes are changed.

ERROR

The MAM has failed (for example from a bad

checksum)

MEDIUM

ERROR

0C0Bh (MAM write error)

The Parameter List Length results in the truncation ILLEGAL

1A00h (parameter list length

error)

of an attribute.

REQUEST

The combination of Volume Number and Partition

Number is not valid.

ILLEGAL

REQUEST

2400h (invalid field in CDB)

WRITE ATTRIBUTE 8Dh 181

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Description

Sense Key

Additional Sense

The parameter data attempts to change a read- ILLEGAL

only attribute, that is, one that has the Read-Only REQUEST

bit (see “MAM attribute data” on page 115) set

to one when read with the READ ATTRIBUTE

2600h (invalid field in

parameter list)

command. None of the attributes are changed.

The parameter data contains an attribute with an

incorrect Attribute Length field value. None of the

attributes are changed.

ILLEGAL

REQUEST

2600h (invalid field in

parameter list)

The parameter data contains an attribute with an

unsupported Attribute Value field value. None of the

attributes are changed.

ILLEGAL

REQUEST

2600h (invalid field in

parameter list)

The attributes are not in ascending order in the ILLEGAL

Parameter List. None of the attributes are changed. REQUEST

2600h (invalid field in

parameter list)

There is not enough space to write all the attributes to ILLEGAL

5506h (MAM full)

the MAM. None of the attributes are changed.

REQUEST

182 Commands

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WRITE BUFFER

3Bh

Write Buffer is used to transfer data into memory on the drive for the purposes of diagnostics, tests

or firmware upgrade. The data is placed into one of the drive buffers depending on the Mode and

Buffer ID fields of the command.

CAUTION: Do not attempt to use the buffer modifying functions of this command unless you

really know what you are doing. The buffer modifying functions are intended as a diagnostic

aid to be used in conjunction with the Read Buffer command. It is not possible to modify data in

the buffer so that it subsequently written to media because all host data is flushed before

executing the command.

The firmware download functions are intended for use by manufacturing and by customers using

upgrade utilities supplied by HP.

Pre-execution checks:

Illegal Field

Reservation

Deferred Error

Unit Attention

Command descriptor block:

Operation Code (3Bh)

Reserved (0)

Mode

Buffer ID

(MSB)

Buffer Offset

(LSB)

Parameter List Length

Control

CDB fields:

Mode

This field can be set to one of the following values:

00h The drive transfers a 4 -byte header from the host (which should be set to zeros),

followed by (allocation length − 4) bytes of data. The data is written into the

buffer identified by the Buffer ID, starting from offset zero in the buffer.

The Buffer ID and Buffer Offset must both be zero. Allocation Length must not

exceed (buffer size + 4).

02h The drive transfers allocation length bytes of data from the host, bytes of data

which is placed in the buffer indicated by Buffer ID, starting from Buffer Offset

from the start of the buffer. No header is sent.

The Buffer Offset and Allocation Length must be kept within the buffer size, and

the Buffer ID must to set to one of the valid values.

WRITE BUFFER 3Bh 183

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04h This mode is used to transfer new firmware to the drive. The drive receives

Allocation Length bytes of data from the host. The data is stored in the drive’s

buffer.The location in the buffer at which the data is written is determined by

the firmware.

The firmware image is divided into a number of blocks of data which are sent

to the drive using multiple Write Buffer commands.

All the firmware image data should be transferred using this mode.

The Buffer ID and Buffer Offset are ignored.

05h This mode is used to indicate that the complete firmware image has been sent

to the drive. This is the signal for entering the FLASH reprogramming stage of

the firmware upgrade process.

Once this command has been received, and the associated data stored in the

buffer, the resident firmware checks the validity of the image that has been

received. If this seems to be correct, the Firmware Upgrade operation will

commence. If any faults are detected in the format of the image, the drive will

report CHECK CONDITION to the host. The sense key is ABORTED

COMMAND, and the additional sense is set to 2600h (invalid field in

parameter list).

CAUTION: Once this command has been sent and completed, the

drive’s power supply must not be interrupted until the drive has

completed the firmware upgrade.

The Buffer ID and Buffer Offset are ignored.

0Ah/ This mode is used to write to the Echo Buffer.

1Ah

The Buffer ID and Offset are ignored.

Buffer ID

Specifies which buffer to read.

00h Main buffer (RAM) Offset Boundary: 1 byte

01h Processor addressable memory (RAM) Offset Boundary: 1 byte

02h SCSI burst buffer (RAM) Offset Boundary: 4 bytes

or FC burst buffer (RAM) Offset boundary: 512 bytes

13h PCA EEPROM Offset Boundary: 1 byte

20h Main buffer segment 0 (RAM) — see below for description)

21h Main buffer segment 1 (RAM) — see below for description)

22h Main buffer segment 2 (RAM) — see below for description)

23h Main buffer segment 3 (RAM) — see below for description)

24h Main buffer segment 4 (RAM) — see below for description)

25h Main buffer segment 5 (RAM) — see below for description)

26h Main buffer segment 6 (RAM) — see below for description)

27h Main buffer segment 7 (RAM) — see below for description)

Buffer Offset Where in the buffer the data should be written. This must be smaller than the size of the

buffer and must obey the specified offset boundary. When downloading new firmware,

this field is ignored.

Parameter List The amount of data. This must be smaller than the difference between the Buffer Offset

Length

field and the size of the buffer.

184 Commands

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Memory sizes

Main buffer memory:

The Main Buffer memory is 128 MB.

Areas of the Main Buffer memory are used by the firmware. These should not be written to and

should not be expected to retain values that are written to them. Any Write and Read Buffer tests

can be performed while the drive is idle. If the drive is reading or writing, the data being written or

read can be corrupted.

Since the drive has more than 16 MB of Main Buffer memory, additional buffer IDs have been

defined to allow the whole buffer to be accessed in 16 MB segments. These are defined as follows:

Buffer ID

20h

Address

00000000h + Buffer Offset (same as Buffer ID 00h)

01000000h + Buffer Offset (that is, +16 MB)

02000000h + Buffer Offset (that is, +32 MB)

03000000h + Buffer Offset (that is, +48 MB)

04000000h + Buffer Offset (that is, +64 MB)

05000000h + Buffer Offset (that is, +80 MB)

06000000h + Buffer Offset (that is, +96 MB)

07000000h + Buffer Offset (that is, +112 MB)

21h

22h

23h

24h

25h

26h

27h

Main processor memory:

Not all the Processor memory space is accessible. Take care when writing to any addresses within

this buffer.

SCSI burst buffer:

Addressable range from 00000h through 3F8000h.

PCA EEPROM:

The write range is limited to 500h bytes, starting at 100h (TapeTools area).

WRITE BUFFER 3Bh 185

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WRITE FILEMARKS

10h

WRITE FILEMARKS causes the specified number of filemarks to be written beginning at the current

logical position on tape.

If the Immed bit is set, GOOD status may be reported and the marks left in the data buffer.

Otherwise, all buffered data and marks are written before status is reported.

If zero filemarks are to be written, the Immed bit must be zero. The drive writes any buffered data

and marks to tape before reporting. This is the recommended way for a host to flush the buffer.

Pre-execution checks:

Illegal Field

Reservation

Deferred Error

Unit Attention

Media Access

Media Write

Diagnostic Status

Command descriptor block:

Operation Code (10h)

Reserved (0)

WSmk

Immed

(LSB)

(MSB)

Number of Filemarks

Control

CDB fields:

Immed

Status will not be returned until the operation is complete.

The drive returns GOOD status following the pre-execution checks (that is, before the

command starts executing).

WSmk

This bit is not supported and must be set to zero.

Number of

Marks

Zero is valid only when immediate report is disabled.

>0 This number of filemarks is to be written.

Specific status:

Write Filemark sense is identical to status for the Write command.

186 Commands

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Glossary

algorithm

rigorous set of rules for a procedure. In the context of data compression, the rules

are for transforming the way data is represented.

ANSI

American National Standards Institute, which sets standards for, amongst other

things, SCSI and the safety of electrical devices.

asynchronous

BOM

see data transfer phase

Beginning Of Media. The first point on the tape that can be accessed by the drive.

checksum

The sum of a series of bytes written to the tape, which can be checked against the

sum of the same series of bytes when the tape is read in order to identify errors.

compression

A procedure in which data is transformed by the removal of redundant information

in order to reduce the number of bits required to represent the data.

compression ratio

A measure of how much compression has occurred, defined as the ratio of the

amount of uncompressed data to the amount of compressed data into which it is

transformed. The LTO-DC algorithm can typically achieve a compression ratio of

between 2:1 and 4:1 depending on the nature of the data.

data set

A fixed-size block of compressed host information.

data transfer phase After accepting a command from the host (initiator), the tape drive (target) sets the

SCSI bus to transfer the data associated with the command. Information is

transferred in one of three ways, depending on the negotiated settings between

initiator and target. The simplest (and slowest) is asynchronous, where the target

requests the transfer of each byte or word, then must wait for the initiator to signal

that the byte or word has been transferred before it starts the next byte transfer.

Synchronous transfers allow the target to request many transfers at once, up to a

limit agreed between initiator and target at startup. Only once the “credit” has

been used up, does the target have to pause and wait for the initiator to signal

successful transfer of the words. Ultra320 SCSI introduces a faster still method

called paced transfers; these are similar in concept to synchronous transfers.

Asynchronous and synchronous transfers may take place either with eight-bit bytes

(“narrow”) or sixteen-bit words (“wide”). Paced transfers are always wide.

decompression

DSIT

A procedure in which the original data is generated from compressed data.

Data Set Information Table. Part of the data set that describes its contents.

Glossary 187

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ECMA

European Computer Manufacturers Association. The European equivalent of

ANSI.

enhanced commands SCSI commands that are vendor-unique and not part of the common SCSI set.

EOD

End Of Data. An area that signifies the end of the valid data. If new data is

written over a larger quantity of old data, it is possible for data to exist after EOD,

but because it is after EOD, this old data is no longer valid.

EOM

End Of Media format. The last usable point on the tape.

EW-EOM

Early Warning End Of Media. A physical mark or a device-computed position on

the tape that tells the drive that it is approaching EOM.

filemark

filemark count

FRU

A mark written by the host. It does not necessarily separate files; it is up to the host

to assign a meaning to the mark.

The number of filemarks written since the beginning of the current tape up to and

including the current group.

Field Replaceable Unit, an assembly or group of components that is replaced in its

entirety by Service Engineers when it contains a fault.

host

The host computer system acting as controller for the drive.

immediate mode

A mode of responding to SCSI commands where the drive or other peripheral

does not wait until the command has finished before returning status information

back to the host. For writing filemarks, Immediate mode can significantly improve

the performance of systems that do not set the Immediate bit when sending a SCSI

Write Filemarks command. On the other hand, data is not flushed to tape in

response to a filemark command.

load

LUN

The process in which the drive takes in an inserted cartridge and goes online.

Logical Unit Number, by which different devices at a particular SCSI ID can be

addressed individually. The drive has a fixed LUN of 0.

LVD

Low-Voltage Differential. See SCSI.

see read-after-write

RAW

read-after-write

RAW improves data integrity by reading data immediately after it is written and

writing the data again if an error is found.

reserved

Not generally available for use with the drive. A reserved field should contain all

zero bits.

188 Glossary

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SCSI

Small Computer System Interface—a standard command specification and

command set that enables computers and peripherals to communicate with each

other. HP’s Ultrium drives adhere to the SCSI specifications (see Chapter 1,

“Interface Implementation” in Volume 3, The SCSI Interface, of the HP Ultrium

Technical Reference Manual) and support all features required by those standard.

Single-Ended and Low Voltage Differential SCSI

These terms define how the signals are transmitted along the cable.

With single-ended (SE) SCSI, each signal travels over a single wire and each

signal's value is determined by comparing the signal to a paired ground wire.

Signal quality tends to decrease over longer cable lengths or at increased signal

speed.

With low voltage differential (LVD) signaling, signals travel along two wires and

the difference in voltage between the wire pairs determines the signal value. This

enables faster data rates and longer cabling with less susceptibility to noise than

SE signaling and reduced power consumption.

Narrow and Wide, Fast, Ultra SCSI and above

Narrow SCSI devices can transfer data one byte at-a -time (and are sometimes

called “8-bit SCSI” devices). They can conform to either the SCSI-2 or SCSI-3

protocols. They have a 50 -pin connection to the SCSI bus.

Wide SCSI devices can transfer two bytes of data simultaneously (“16 -bit SCSI”).

They usually have a single, 68-pin connection to the SCSI bus. (This physical

arrangement is part of the SCSI-3 specification.) They may support either SCSI-2 or

SCSI-3 protocols. Wide and narrow devices can simultaneously be connected to

the same bus without problem, provided certain rules are followed.

Fast SCSI can transfer data at up to 20 MB/ s wide, using a cable of up to 6

meters total length.

Ultra SCSI can transfer data at up to 40 MB/ s wide, but the cable length cannot

exceed 3 meters (it is also known as “Fast20”).

Ultra2 SCSI can transfer data at up to 80 MB/ s wide, using a cable of up to 25

meters total length for a single device, or up to 12 meters for two or more devices

(it is also known as “Fast40”).

Ultra3 or Ultra160 can transfer data at up to 160 MB/ s wide. Cable lengths are

as for Ultra2.

Ultra4 or Ultra320 transfer data at up to 320 MB/ s. Cable lengths are as for

Ultra2.

Glossary 189

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Ultra SCSI supports both SE and LVD interfaces. In normal situations, slower

devices can coexist with faster devices, and narrow devices can be used on the

same SCSI bus as wide devices using a suitable adapter.

HP’s Generation 1 Ultrium drives are Ultra2, wide SCSI-3 compatible devices.

They can be used with both LVD and SE host bus adapters.

Generation 2 Ultrium drives are Ultra160, wide SCSI-3 compatible.

Generation 3 Ultrium drives are Ultra320 compatible; however for performance

reasons they should not be used on an SE bus.

sense data

Data returned after the execution of a SCSI command, telling the host whether the

transaction was successful, and if not, what went wrong.

sequential access

Sequential access devices store data sequentially in the order in which it is

received. Tape devices are the most common sequential access devices. Devices

such as disk drives are direct access devices, where data is stored in blocks, not

necessarily sequentially. Direct access allows for speed of retrieval, but is

significantly more costly.

single-ended

spacing

see SCSI

Spacing is moving along the tape over a specified number of blocks or filemarks,

or to EOD, in order to find data quickly.

sub-data set

synchronous

TapeAlert

One sixteenth of a data set

see data transfer phase

A set of 64 flags is held in the TapeAlert log that indicate faults or predicted faults

with the drive or the media. By reading this log, host software can inform the user

of existing or impending conditions, and can, for example, advise the user to

change the tape.

vendor-unique

The addition of commands to SCSI that are not included in the standard.

190 Glossary

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I n dex

bu f fered data, flushed to tape

178

burst size 78

bus de vice deferred errors 157

bus de vice reset 13, 155

bus ina c tivity limit 7 8

bus parity errors 1 5

BUSY status 2 7

ERASE 38

INQUIRY 39

LOAD/ UNLOAD 50

LOCA T E 5 3

LOG SELECT 5 5

abort hand l ing 1 4

Aborted Command 1 58

additional sense codes 1 49 ,

150, 152, 159

addressing, fibre channel 18

algorithms 187

LOG SENSE 57

MODE SELECT 7 1

MOVE MEDIUM 105

overlapping 162

PERSISTENT RESER VE IN 9 8

PERSISTENT RESERVE OUT

101

READ ATTRIBUTE 1 11

READ BLOCK LIMITS 1 20

READ BUFFER 121

READ CAPAC I TY 2 1 , 1 24

READ MEDIA SERIAL

N U MBER 1 25

READ TOC 21, 131

RECEIVE DIAGNOSTIC

RESULTS 133

RELEASE UNIT 135

REPORT DENSITY SUPPORT

137

REPORT DEVICE IDENT IFIER

140

compression 80

decompression 80

ANSI 7, 187

append error 162

ASC/ Q 159

asynchronous 187

asynchronous da t a tr a n sfer 1 1

asynchronous transfers 187

attribute data 115

attributes

c a pacity data 124

c a r tridge memory

accessible in hold position

50, 79

failed 51, 179

size 123

c a r tridges

faulty 1 62

removal prevented 162

CDB 35

C D-ROM Emulation/ Disaster

R e co very Mode page 94

C D-ROM mode

ID values 116

standard device types 1 16

standard host type 118

st a n dard medium type 1 18

writing 180

READ 10 comm a n d 1 10

READ CAPACITY comm a n d

124

Bad LUN check 30

bit pointer 151

BLANK CHECK 1 58

blank media, met during read

108

blocks, spacing over 1 73

BOM 149, 150, 1 87

detected 159

met during space 173

BOP, met during space 173

BPV bit 151

READ TOC comm a n d 1 31

SEEK command 1 67

START/ STO P c omm a n d 1 75

CHECK CONDITION 27

checksum 187

cle a n ing 151, 1 61

cleaning cartridge 1 61

Cleaning Needed sense data

descriptor 154

clearing logs 55

CLN bit 151

command descriptor block 35

command phase error 162

commands 37

REPORT LUNS 1 41

REPORT SUPP O R TED

OPCODES 143

REPORT SUPPORTED T A SK

MANAGEMENT

FUNCTIONS 145

REQUEST SENSE 147

RESERVE UNIT 164

REW IND 166

brackets, round, square 73

buffer

echo 121, 184

reading 121

writing 180, 183

SEEK 21, 167

SEND DIAGNOSTIC 168

SET CAPACITY 170

enhanced 188

Index 191

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SET DEVICE IDENTIFIER 1 71

SPACE 172

de f e rred errors 149 , 1 50 ,

152

counters 60

data phase 162

START/ STOP 21, 1 75

supported 12

VERIFY 177

descriptor f o rm a t s ense d a t a

152

deferred 149, 150, 152

invalid messa ge 1 62

message 162

D evice Configuration page 81

D evice Status l o g 7 0

D evice Time Mode page 9 2

Di a gnostic Status check 31

d i a gnos t ics 133

failure 162

sending 1 68

disconnect strategy 16

Disconnect-Reconnect Mode

page 78

W RITE 178

parity 162

WRITE ATTRI BUTE 1 80

WRITE BUFFER 183

W RITE FILEMARKS 1 86

compatibility 161

compression 187

algorithm 80

read, unrecovered 159

sequential positioning 161

write 159

write a ppend 1 62

write-behind deferred 1 56

EVPD bit 39

ratio 187

control byte 35

EW -EOM 188

met during loca t e 5 4

control field 35

documents, related 7

Drive Error Code sense da t a

descriptor 1 54

drive error codes 151, 1 63

DSIT 187

Control Mode p a ge 7 9

current sense 154

clearing 1 55

f a i l e d cartridge memory 51,

179

f a ults, predicting 65

fi b re channel

DTD primary port st a t us 6 4

DTD Sta t us L o g page 6 2

Data Compression

Capable bit 80

Char a c teristics Mode p a ge

addressing 18

names 18

Fi b re Channel Logic a l U nit

Control Mode page 8 4

fi b re channel opera t ion 1 8

Fi b re Channel P o rt Control

Mode page 85

fi e l d p o inter 151

fi e l d r e p l a c eab l e u nits 2 0

fi e l d , i nv a l id 1 60

echo buffer 121, 184

E CMA 188

e j e ction failure 162

enhanced comm a n ds 1 88

EOD 188

Ena b l e b i t 8 0

log 68

SDCA 81

data compression 187

algorithm 80

data decompression algorithm

Data Decompression E n a b l e b i t

detected 159

met during locate 54

met during read 108

met during space 173

not found 160

fil e m a r k count 188

fil e m a r ks 149, 150, 188

detected 159

da t a p hase error 1 62

DATA PROTECT 158

data transfer

asynchronous 11

synchronous 11

data transfer phase 187

DCC bit 80

DCE bit 80

DDE bit 80

decompression 187

algorithm 80

spacing to 173

E OM 149, 150, 1 88

detected 1 59

met during read 108

met during space 1 73

spacing over 1 73

writing 186

met during locate 54

met during read 108

met during space 173

EOP, met during space 173

ERASE command 38

erase, failure 162

error codes 148, 163

drive 151

Fixed bit 107, 178

Fixed Bit check 31

fixed format sense data 148

Flag Link check 31

flush, buffered data 178

format, corrupt 161

FRUs 20, 188

Deferred Error check 30

DEFERRED ERROR sense 156

errors

bus device deferred 157

command phase 162

192 Index

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Load/ Unload Specific St a t us

l o ad i ng 1 88

MAM

GOOD sta t us 2 7

group code 35

a c cessible 1 62

attribute data 1 15

full 163

inaccessible 159

reading 111

failure 162

tape 51

localization identifiers 119

L O C A T E c omm a n d 53

L OG SE L E C T comm a n d 5 5

L OG SENSE 57

Data Compression L o g page

HARDW A R E ERR O R 1 57

heads, cleaning 151

hold bit 50

hold position 50, 79

Host 188

write error 159

writing 180

M a rgin Control mode sub -p age

Device Sta t us L o g page 7 0

DTD Status Log page 62

pa r a m eter p a ges 5 8

Performance Data Log page

Read Error Counters Log

page 60

Sequential Access Device

Log page 61

M ark bit 149, 1 50

Media Access check 3 2

Media Information check 3 3

Media W rite check 33

M EDIUM ERROR 157

Medium Partitions Mode page

IDENTIFY message, invalid bits

161

identifying L U N s 1 5

ILI bit 149, 150

Illegal Comm a n d check 3 1

Illegal Field check 31

ILLEGAL REQUEST 1 58

immediate mode 1 88

during writing 178

Information Exceptions Mode

page 9 1

messages 23

error 162

invalid 162

supported 11

Supported Log Pages page

Tape Capacity Log page 6 8

Tape Usage L o g page 6 7

TapeAlert Log page 65

Temperature Log page 6 2

W rite Error Counters L o g

pages 60

microcode download 162

Mode Parameter pages 72

M O D E SE L E C T

Information sense data

descriptor 153

INQUIRY

CD-ROM Emulation/ Disaster

Recovery Mode page 94

comm a n d 7 1

Control Mode page 79

Data Compression

Characteristics page 79

Device Confi g ur a t ion p a ge

Device Time Mode page 9 2

Disconnect-Reconnect page

Fibre Channel Logical Unit

Control Mode page 84

Fibre Channel Port Control

Mode page 85

command 39

data pages 40

logs

Defined Identifiers page 4 6

Device Identification page

drive component revision

levels pages 49

clearing 55

Data Compression 6 8

Device Sta t us 7 0

parameter pages 58

Performance Data 6 9

reading 57

supported 59

Tape Capacity 68

Tape Us a ge 6 7

extended INQUIRY data VPD

page 48

sequential access de v ice

capabilities page 48

Unit Serial Number page 45

interface, SCSI 11

TapeAlert 65, 190

LUN 188

becoming ready 159

identifying 15

not ready 159

Information Exceptions Mode

page 91

Medium Partitions page 83

Mode Parameter header 74

Mode Parameter pages 72

libraries, fibre channel

addressing 20

Load bit 50

not self-configured 162

not supported 160

LVD 188

LOAD/ UNLOAD command 50

Index 193

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R e ad -W r ite Error R e co v e ry

page 76

SCSI LUN Control Mode

page 84

Media Access 3 2

Media Information 33

Media Write 33

REPORT SUPPOR TED

O P C ODES comm a n d 1 43

REPORT SUPPORTED T A SK

MANAGEMENT

Parameter List 34

SCSI Port Control Mode

page 87

monitoring condition 6 5 , 1 90

MOVE MEDIUM comm a n d

105

Reserva t ion 3 4

Unit Attention 34

prevent media removal 1 62

PREVENT/ ALLOW MEDIUM

RE M O V AL 1 05

FU NCTIONS command 145

R eport T r a n sfer C a pab i liti e s

mode sub -p age 90

REQUEST SENSE

command 147

multi-initiator support 17

problems, predicting 65

data 148

reselect failure 1 62

R eservation check 34

RESERVATION CON F L I C T

status 27

reservations, releasing 135

RESERVE UNIT command 164

reserved field 35, 188

reset 155

names, fibre channel 1 8

Negotiated Settings mode sub-

page 89

NO SENSE 157

NOT READY 157

R A W 188

READ 10 comm a n d 2 1 , 1 10

READ 6 command 21

READ A T TR I BUTE c omm a n d

111

READ BLOCK LIMITS command

120

READ BUFFER command 121

R e ad Capabilities service

a c tion 100

READ CAPACITY command

21, 1 24

READ command 106

Read Error Counters Log page

R e ad Keys service a c ti on 9 9

READ MEDIA SERIAL N U M B ER

command 125

R e ad Reservation service a c tion

READ TOC command 21, 1 31

re a d i ng

strategy 13

REW I ND comm a n d 1 66

rounding 161

opcode 35

unrecognized 160

overl a pp i ng comm a n ds 1 62

S a ved Training Configuration

V a l u e s mode sub -p age 8 8

SCSI 7, 11, 189

comm a n ds 3 7

paced transfers 187

parallel protocol request 26

Parameter List check 3 4

parameter list, invalid fi e l d 1 60

parameter round i ng 1 61

parity error 1 62

Performance Data log 69

PERSISTENT RESER VE IN

command 98

PERSISTENT RESERVE OUT

command 101

polling delay 64

power-on 155

PPR 26

interface 11

messages 2 3

parity error 1 62

supported messages 1 1

SCSI LUN Control Mode page

SCSI Port Control Mode page

SCSI-2, support 13

SCSI-3 11

SDTR 25

SEEK command 2 1 , 1 67

select failure 162

self-test 133, 168

SEND DIAGNOSTIC command

168

error 159

failure 54, 108

logs 57

R e ad-W rite Error R e co v e r y

Mode page 76

pre-execution checks 30

Bad LUN 30

RECEIVE DIAGNOSTIC

RESULTS command 133

RELEASE UNIT command 135

REPORT DENSITY SUPPORT

command 137

REPORT DEVICE IDENTIFIER

command 140

REPORT LUNS command 141

Deferred Error 30

Diagnostic Status 31

Fixed Bit 31

Flag Link 31

Illegal Command 31

Illegal Field 31

sense

DEFERRED ERROR 156

UNIT ATTENTION 155

sense data 190

194 Index

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descriptor format 152

fixed format 148

management 1 54

sense data descriptors

Cleaning Needed 1 54

Drive Error Code 154

Information 153

Sense K e y Speci f ic 1 53

Stream Commands 154

Sense Key Specific sense d a t a

descriptor 153

sense k e ys 1 49 , 1 50 , 1 57

specific bytes 149, 1 50

sequential access 190

SequentialAccess comm a n d set

Sequential Access Device Log

page 61

sequential positioning error

161

service actions 1 12

R e ad Capab i liti e s 1 00

Read Keys 9 9

synchronous 1 90

error 159

W R ITE A T TRIBUTE c omm a n d

180

W RITE B UFFER c omm a n d 1 83

W R ITE c omm a n d 178

write delay time 8 1

W r ite Error Counters Log page

W R ITE FI L E MA R KS command

186

write-behind deferred errors

156

write-protection 160

W Smk bit 186

synchronous data tr a n sfer 1 1

synchronous data tr a n sfer

request 25

synchronous transfers 187

t a pe

faulty 162

incompatible 161

loaded 155

loading 51

removal prevented 162

unloading 51

T a pe Capacity log 68

T a pe Usage log 67

T a peAlert log 190

TapeAlert Log page 65

T e mpe r a t ure L o g page 6 2

t e xt localization identifiers 1 19

third -p a r ty, reserving for 1 35

T O C da t a 132

Read Reservation 99

SET CAPACITY comm a n d 1 70

SET DEVICE IDENTIFIER

comm a n d 1 71

Unit Att e ntion check 34

UNIT ATTENTION sense 155,

158

UNLOAD command 50

unloading tape 5 1

SILI 107

bit 107

error 108

SKSV bit 149, 150

SPACE command 1 72

spacing 190

START / S T O P c omm a n d 2 1 ,

175

Vendor-Unique 190

VERIFY command 177

very high frequency da t a 6 2 ,

very high frequency po l ling

delay 64

status

BUSY 27

byte 26

CHECK CONDITION 27

GOOD 27

VHF 62, 63

Volume Overflow 158

RESERVATION CONFLICT

Stream Commands sense data

descriptor 154

Summary 29

supported commands 12

Supported Log Pages page 59

W DTR 25

wide data transfer request 25

WORM cartridges 82

write

append error 162

Index 195

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196 Index

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