Cheetah 15K.4 FC
ST3146954FC
ST373554FC
ST336854FC
Cheetah 15K.4 FC
ST3146954FC
ST373554FC
ST336854FC
©2005, 2006, Seagate Technology LLC All rights reserved
Publication number: 100366896, Rev. B
March 2006
Seagate, Seagate Technology, and the Seagate logo are registered trademarks of Seagate
Technology LLC. SeaTools, SeaFONE, SeaBOARD, and SeaTDD are either registered
trademarks or trademarks of Seagate Technology LLC. Other product names are registered
trademarks or trademarks of their owners.
Seagate reserves the right to change, without notice, product offerings or specifications. No
part of this publication may be reproduced in any form without written permission of Seagate
Technology LLC.
Revision status summary sheet
Revision
Date
Sheets Affected
Rev. A
07/15/05
03/17/06
All.
Rev. B (Draft 1)
Pages 25 and 26.
Contents
Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Applicable standards and reference documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Electromagnetic compatibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Electromagnetic compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Reference documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Standard features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Media description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Formatted capacities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Programmable drive capacity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Factory-installed accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Factory-installed options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
User-installed accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Internal drive characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Seek performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Access time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
General performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Start/stop time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Prefetch/multi-segmented cache control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Cache operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Caching write data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Prefetch operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Reliability specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Error rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Recoverable Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Unrecoverable Errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Seek errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Interface errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Reliability and service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Mean time between failure (MTBF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Preventive maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Hot plugging the drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
S.M.A.R.T. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Thermal monitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Drive Self Test (DST). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Product warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Physical/electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
AC power requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
DC power requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Conducted noise immunity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Power sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Current profiles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.4
Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Environmental limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Cheetah 15K.4 FC Product Manual, Rev. B
i
Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Air cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Electromagnetic susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Mechanical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Drive internal defects/errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Drive error recovery procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Drive ID/option selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
J6 connector requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Drive orientation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Cooling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Drive mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Fibre Channel link service frames . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Fibre Channel fabric accept login. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Fibre Channel Arbitrated Loop options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Miscellaneous operating features and conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Physical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Connector requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
FC-AL transmitters and receivers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Active LED Out. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Device control codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
9.6
ii
Cheetah 15K.4 FC Product Manual, Rev. B
TTL input characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
LED driver signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
FC Differential output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
FC Differential input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
10.0
Seagate Technology support services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Cheetah 15K.4 FC Product Manual, Rev. B
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iv
Cheetah 15K.4 FC Product Manual, Rev. B
List of Figures
Cheetah 15K.4 FC family disc drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Typical ST3146954FC drive, 2 Gbit, +12V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Typical ST3146954FC drive, 2 Gbit, +5V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Typical ST373554FC drive +12V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Typical ST373554FC drive +5V current profile. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Typical ST336854FC drive +12V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Typical ST336854FC drive +5V current profile. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 10. ST336854FC DC current and power vs. input/output operations per second . . . . . . . . . . . . 33
Figure 11. Locations of the HDA temperature check point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 12. Recommended mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 13. Mounting configuration dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 14. Physical interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Figure 15. LED indicator connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Figure 16. Air flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Figure 17. Physical interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Figure 18. Port bypass circuit physical interconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Figure 19. FC-AL SCA device connector dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Figure 20. J6 connector dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Figure 21. FC-AL transmitters and receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Figure 22. Transmit eye diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Figure 23. Receive eye diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Cheetah 15K.4 FC Product Manual, Rev. B
v
1.0
Scope
This manual describes Seagate Technology® LLC, Cheetah® 15K.4 FC (Fibre Channel) disc drives.
Cheetah 15K.4 FC drives support the Fibre Channel Arbitrated Loop and SCSI Fibre Channel Protocol specifi-
cations to the extent described in this manual. The Fibre Channel Interface Manual (part number 77767496)
describes the general Fibre Channel Arbitrated Loop characteristics of this and other Seagate Fibre Channel
drives.
Figure 1.
Cheetah 15K.4 FC family disc drive
Cheetah 15K.4 FC Product Manual, Rev. B
1
2
Cheetah 15K.4 FC Product Manual, Rev. B
2.0
Applicable standards and reference documentation
The drive has been developed as a system peripheral to the highest standards of design and construction. The
drive depends upon its host equipment to provide adequate power and environment in order to achieve opti-
mum performance and compliance with applicable industry and governmental regulations. Special attention
must be given in the areas of safety, power distribution, shielding, audible noise control, and temperature regu-
lation. In particular, the drive must be securely mounted in order to guarantee the specified performance char-
2.1
Standards
The Cheetah 15K.4 FC family complies with Seagate standards as noted in the appropriate sections of this
manual and the Seagate Fibre Channel Interface Manual, part number 77767496.
The Cheetah 15K.4 FC disc drive is a UL recognized component per UL1950, CSA certified to CAN/CSA
C22.2 No. 950-95, and VDE certified to VDE 0805 and EN60950.
2.1.1
Electromagnetic compatibility
The drive, as delivered, is designed for system integration and installation into a suitable enclosure prior to
use. As such the drive is supplied as a subassembly and is not subject to Subpart B of Part 15 of the FCC
Rules and Regulations nor the Radio Interference Regulations of the Canadian Department of Communica-
tions.
The design characteristics of the drive serve to minimize radiation when installed in an enclosure that provides
reasonable shielding. As such, the drive is capable of meeting the Class B limits of the FCC Rules and Regula-
tions of the Canadian Department of Communications when properly packaged. However, it is the user’s
responsibility to assure that the drive meets the appropriate EMI requirements in their system. Shielded I/O
cables may be required if the enclosure does not provide adequate shielding. If the I/O cables are external to
the enclosure, shielded cables should be used, with the shields grounded to the enclosure and to the host con-
troller.
2.1.1.1
Electromagnetic susceptibility
As a component assembly, the drive is not required to meet any susceptibility performance requirements. It is
the responsibility of those integrating the drive within their systems to perform those tests required and design
their system to ensure that equipment operating in the same system as the drive or external to the system
does not adversely affect the performance of the drive. See Table 2, DC power requirements.
Cheetah 15K.4 FC Product Manual, Rev. B
3
2.1.2
Electromagnetic compliance
Seagate uses an independent laboratory to confirm compliance with the directives/standards for CE Marking
and C-Tick Marking. The drive was tested in a representative system for typical applications. The selected sys-
tem represents the most popular characteristics for test platforms. The system configurations include:
• Typical current use microprocessor
• 3.5-inch floppy disc drive
• Keyboard
• Monitor/display
• Printer
• External modem
• Mouse
Although the test system with this Seagate model complies with the directives/standards, we cannot guarantee
that all systems will comply. The computer manufacturer or system integrator shall confirm EMC compliance
and provide the appropriate marking for their product.
Electromagnetic compliance for the European Union
If this model has the CE Marking it complies with the European Union requirements of the Electromagnetic
Compatibility Directive 89/336/EEC of 03 May 1989 as amended by Directive 92/31/EEC of 28 April 1992 and
Directive 93/68/EEC of 22 July 1993.
Australian C-Tick
If this model has the C-Tick Marking it complies with the Australia/New Zealand Standard AS/NZS3548 1995
and meets the Electromagnetic Compatibility (EMC) Framework requirements of Australia’s Spectrum Man-
agement Agency (SMA).
Korean MIC
If this model has the Korean Ministry of Information and Communication (MIC) logo, it complies with paragraph
1 of Article 11 of the Electromagnetic Compatibility (EMC) Control Regulation and meets the Electromagnetic
Compatibility Framework requirements of the Radio Research Laboratory (RRL) Ministry of Information and
Communication Republic of Korea.
Taiwanese BSMI
If this model has the Chinese National Standard (CNS) 13438 marking, it complies with Chinese National Stan-
dard (CNS) 13438 and meets the Electromagnetic Compatibility (EMC) Framework requirements of the Tai-
wanese Bureau of Standards, Metrology, and Inspection (BSMI).
4
Cheetah 15K.4 FC Product Manual, Rev. B
2.2
Reference documents
Cheetah 15K.4 FC Installation Guide
Seagate part number: 100366897
Seagate part number: 77767496
Fibre Channel Interface Manual
ANSI Fibre Channel Documents
Project T11/1619-D
Project T11/1506-D
ANSI INCITS 332-1999
ANSI INCITS 332-1999/AM1-2003
ANSI INCITS 350-2003
NCITS TR-19
FC-FS-2 Fibre Channel - Framing and Signaling
FC-PI-2 Fibre Channel - PHYSICAL INTERFACES - 2
FC.AL-2 Arbitrated Loop 2
FC.AL-2 Arbitrated Loop 2 Amendment
FCP-2 Fibre Channel Protocol 2
Private Loop SCSI Direct Attach (PLDA)
Fabric Loop Attachment (FC-FLA)
NCITS TR-20
SFF-8045
SFF-8067
Specification for 40-pin SCA-2 Connector with Parallel Selection
Specification for 40-pin SCA-2 Connector with Bidirectional
Enclosure Services Interface
ANSI Small Computer System Interface (SCSI) Documents
ISO/IEC 14776-xxx
ISO/IEC 14776-xxx
ISO/IEC 14776-xxx
SCSI Architecure Model-3 (SAM-3) Standard (T10/1561-D)
SCSI Primary Commands-3 (SPC-3) Standard (T10/1416-D)
SCSI Block Commands-2 (SBC-2) Standard (T10/1417-D)
Specification for Acoustic Test Requirement and Procedures
Seagate part number: 30553-001
Package Test Specification
Package Test Specification
Seagate P/N 30190-001 (under 100 lb.)
Seagate P/N 30191-001 (over 100 lb.)
In case of conflict between this document and any referenced document, this document takes precedence.
Cheetah 15K.4 FC Product Manual, Rev. B
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6
Cheetah 15K.4 FC Product Manual, Rev. B
3.0
General description
Cheetah 15K.4 FC drives combine giant magnetoresistive (GMR) heads, partial response/maximum likelihood
(PRML) read channel electronics, embedded servo technology, and a Fibre Channel interface to provide high
performance, high capacity data storage for a variety of systems including engineering workstations, network
servers, mainframes, and supercomputers. Cheetah 15K.4 FC drives also support 2-Gbit Fibre Channel which
can transfer data at up to 200 Mbytes per second and 400 Mbytes per second in dual-loop configurations.
ST373453, ST336753, and ST318453 models also support 4-Gbit Fibre Channel which can transfer data at up
to 400 Mbytes per second and 800 Mbytes per second in dual-loop configurations.
Cheetah 15K.4 FC drives support the Fibre Channel Arbitrated Loop (FC-AL) and SCSI Fibre Channel Proto-
col as described in the ANSI specifications, this document, and the Fibre Channel Interface Manual (part num-
ber 77767496) which describes the general interface characteristics of this drive. Cheetah 15K.4 FC drives are
classified as intelligent peripherals and provide level 2 conformance (highest level) with the ANSI SCSI-1 stan-
dard.
Never disassemble the HDA and do not attempt to service items in the sealed enclosure (heads, media, actu-
ator, etc.) as this requires special facilities. The drive does not contain user-replaceable parts. Opening the
HDA for any reason voids your warranty.
Cheetah 15K.4 FC drives use a dedicated landing zone at the innermost radius of the media to eliminate the
possibility of destroying or degrading data by landing in the data zone. The heads automatically go to the land-
ing zone when power is removed from the drive.
An automatic shipping lock prevents potential damage to the heads and discs that results from movement dur-
ing shipping and handling. The shipping lock disengages and the head load process begins when power is
applied to the drive.
The drives also use a high-performance actuator assembly with a low-inertia, balanced, patented, straight arm
design that provides excellent performance with minimal power dissipation.
Cheetah 15K.4 FC Product Manual, Rev. B
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3.1
Standard features
Cheetah 15K.4 FC drives have the following standard features:
• 4-Gbit Fibre Channel interface. For 2 or 4 gigabit operation, the block size must be divisable by 8.
• Integrated dual port FC-AL controller
• Concurrent dual port transfers
• Support for FC arbitrated loop, private and public attachment
• Differential copper FC drivers and receivers
• Downloadable firmware using the FC-AL interface
• Supports SCSI enclosure services via interface connector
• 128-deep task set (queue)
• Supports up to 32 initiators
• Drive selection ID and configuration options are set on the FC-AL backpanel or through interface com-
mands. Jumpers are not used on the drive.
• Supports SCSI Enclosure Services through the interface connector
• Fibre Channel worldwide name uniquely identifies the drive and each port
• User-selectable logical block size (512 to 528 bytes per logical block). For 2 or 4 gigabit operation, the block
size must be divisable by 8.
• Selectable frame sizes from 256 to 2,112 bytes
• Industry standard 3.5-inch low profile form factor dimensions
• Programmable logical block reallocation scheme
• Flawed logical block reallocation at format time
• Programmable auto write and read reallocation
• Reed-Solomon error correction code
• Sealed head and disc assembly (HDA)
• No preventive maintenance or adjustments required
• Dedicated head landing zone
• Automatic shipping lock
• Embedded Grey Code track address to eliminate seek errors
• Self-diagnostics performed at power on
• 1:1 interleave
• Zone bit recording (ZBR)
• Vertical, horizontal, or top down mounting
• Dynamic spindle brake
• Embedded servo design
• Reallocation of defects on command (Post Format)
• Fibre Channel interface transports SCSI protocol
3.2
Media description
The media used on the drive has an aluminum substrate coated with a thin film magnetic material, overcoated
with a proprietary protective layer for improved durability and environmental protection.
8
Cheetah 15K.4 FC Product Manual, Rev. B
3.3
Performance
• Programmable multi-segmentable cache buffer
• 200 Mbytes/sec maximum instantaneous data transfers per port
• 15k RPM spindle; average latency = 2.0 msec
• Command queuing of up to 128 commands
• Background processing of queue
• Supports start and stop commands (spindle stops spinning)
• Adaptive seek velocity; improved seek performance
3.4
Reliability
• 1,400,000 hour MTBF
• Increased LSI circuitry integration
• Self-Monitoring Analysis and Reporting Technology (S.M.A.R.T.)
• Dithering
3.5
Formatted capacities
Standard OEM models are formatted to 512 bytes per block. The sector size is selectable at format time. Users
having the necessary equipment may modify the data block size before issuing a format command and obtain
different formatted capacities than those listed.
To provide a stable target capacity environment and at the same time provide users with flexibility if they
choose, Seagate recommends product planning in one of two modes:
1. Seagate designs specify capacity points at certain sector sizes that Seagate guarantees current and future
products will meet. We recommend customers use this capacity in their project planning, as it ensures a
stable operating point with backward and forward compatibility from generation to generation. The current
guaranteed operating points for this product are:
ST336854FC
Decimal
ST373554FC
Decimal
ST3146954FC
Decimal
Sector Size
512
Hex
Hex
Hex
71,687,372
70,512,692
70,197,546
68,914,176
68,766,592
445DCCC
433F034
42F212A
41B8C00
4194B80
143,374,744
141,025,384
140,395,092
139,463,602
137,577,184
88BB998
867E068
85E4254
8500BB2
83342E0
286,749,488
282,050,768
280,790,184
279,041,740
275,154,368
11177330
10CFC0D0
10BC84A8
10A1D6CC
106685C0
514
520
522
524
2. Seagate drives also may be used at the maximum available capacity at a given sector size, but the excess
capacity above the guaranteed level will vary between 10K and 15K families and from generation to gener-
ation, depending on how each sector size actually formats out for zone frequencies and splits over servo
bursts. This added capacity potential may range from 0.1 to 1.3 percent above the guaranteed capacities
listed above. Using the drives in this manner gives the absolute maximum capacity potential, but the user
must determine if the extra capacity potential is useful, or whether their assurance of backward and for-
ward compatibility takes precedence.
3.5.1
Programmable drive capacity
Using the Mode Select command, the drive can change its capacity to something less than maximum. See the
Mode Select Parameter List table in the SCSI Interface Product Manual. Refer to the Parameter list block
descriptor number of blocks field. A value of zero in the number of blocks field indicates that the drive shall not
Cheetah 15K.4 FC Product Manual, Rev. B
9
change the capacity it is currently formatted to have. A number in the number of blocks field that is less than
the maximum number of LBAs changes the total drive capacity to the value in the block descriptor number of
blocks field. A value greater than the maximum number of LBAs is rounded down to the maximum capacity.
3.6
Factory-installed accessories
OEM standard drives are shipped with the Cheetah 15K.4 FC Installation Guide (part number 100366897) and
the Safety and Regulatory Agency Specifications, part number 75789512 (unless otherwise specified).
3.7
Factory-installed options
You may order the following items which are incorporated at the manufacturing facility during production or
packaged before shipping. Some of the options available are (not an exhaustive list of possible options):
• Other capacities can be ordered depending on sparing scheme and sector size requested.
• Single-unit shipping pack. The drive is normally shipped in bulk packaging to provide maximum protection
against transit damage. Units shipped individually require additional protection as provided by the single unit
shipping pack. Users planning single unit distribution should specify this option.
• The Cheetah 15K.4 FC Installation Guide, part number 100366897, is usually included with each standard
OEM drive shipped, but extra copies may be ordered.
• The Safety and Regulatory Agency Specifications, part number 75789512, is usually included with each
standard OEM drive shipped, but extra copies may be ordered.
3.8
User-installed accessories
The following accessories are available. All kits may be installed in the field.
• Evaluation kit, Seagate part number 100364396.
This kit provides an adapter card (“T-card”) to allow cable connections for two FC ports and DC power. You
may purchase this evaluation kit from channel distributors or your Seagate representative.
• Single-unit shipping pack.
10
Cheetah 15K.4 FC Product Manual, Rev. B
4.0
Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of
Cheetah 15K.4 FC drives.
4.1
Internal drive characteristics
ST3146954FC
146.8
ST373554FC ST336854FC
Drive capacity
73.4
36.7
Gbytes (formatted, rounded off value)
Read/write data heads
Bytes per track
Bytes per surface
Tracks per surface (total)
Tracks per inch
Peak bits per inch
Internal data rate
Disc rotation speed
Avg rotational latency
8
4
2
471,916
18,351
50,864
85,000
628
685-1,142
15k
2.0
471,916
18,351
50,864
85,000
628
685-1,142
15k
2.0
471,916
18,351
50,864
85,000
628
685-1,142
15k
2.0
Bytes (average, rounded off values)
Mbytes (unformatted, rounded off value)
Tracks (user accessible)
TPI
KBPI
Mbits/sec (variable with zone)
rpm
msec
4.2
Seek performance characteristics
See Section 9.5, "FC-AL physical interface" on page 64 and the Fibre Channel Interface Manual (part number
77767496) for additional timing details.
4.2.1
Access time
1 2
,
Not including controller overhead (msec)
Read
3.5
Write
4.0
Average
Typical
Typical
Typical
Single track
Full stroke
0.27
7.4
0.45
7.9
1.
2.
Typical access times are measured under nominal conditions of temperature, voltage,
and horizontal orientation as measured on a representative sample of drives.
Access to data = access time + latency time.
Cheetah 15K.4 FC Product Manual, Rev. B
11
4.2.2
Format command execution time (minutes)
ST3146954FC
ST373554FC
ST336854FC
90
45
60
30
30
15
Maximum (with verify)
Maximum (without verify)
4.2.3
General performance characteristics
Data buffer to/from disc media (one 512-byte logical block)*
Minimum
Maximum
685 Mbits/sec
1,142 Mbits/sec
Fibre Channel Interface maximum instantaneous transfer rate
200 Mbytes/sec* per port
(dual port = 400 Mbytes/sec*)
Logical block sizes
Default is 512-byte data blocks
Variable 512 to 704 bytes per sector in even number of bytes per
sector. If n (number of bytes per sector) is odd, then n-1 will be used.
Read/write consecutive sectors on a track
Yes
Flaw reallocation performance impact (for flaws reallocated at format time Negligible
using the spare sectors per sparing zone reallocation scheme.)
Average rotational latency
2.0 msec
*Assumes no errors and no relocated logical blocks. Rate measured from the start of the first logical block transfer to or
from the host.
4.3
Start/stop time
If the Motor Start option is disabled, the drive becomes ready within 20 seconds after DC power is applied. If a
recoverable error condition is detected during the start sequence, the drive executes a recovery procedure and
the time to become ready may exceed 20 seconds. Stop time is 30 seconds (maximum) from removal of DC
power.
If the Motor Start option is enabled, the internal controller accepts the commands listed in the Fibre Channel
Interface Manual less than 3 seconds after DC power has been applied. After the Motor Start command has
been received, the drive becomes ready for normal operations within 20 seconds (excluding the error recovery
procedure). The Motor Start command can also be used to command the drive to stop the spindle.
There is no power control switch on the drive.
4.4
Prefetch/multi-segmented cache control
The drive provides a prefetch (read look-ahead) and multi-segmented cache control algorithms that in many
cases can enhance system performance. Cache refers to the drive buffer storage space when it is used in
cache operations. To select this feature, the host sends the Mode Select command with the proper values in
12
Cheetah 15K.4 FC Product Manual, Rev. B
the applicable bytes in page 08h. Prefetch and cache operations are independent features from the standpoint
that each is enabled and disabled independently using the Mode Select command; however, in actual opera-
tion, the prefetch feature overlaps cache operation somewhat as described in sections 4.5.1 and 4.5.2.
All default cache and prefetch mode parameter values (Mode Page 08h) for standard OEM versions of this
drive family are given in Table 18.
4.5
Cache operation
Note. Refer to the Fibre Channel Interface Manual for more detail concerning the cache bits.
Of the 16,384 kbytes physical buffer space in the drive, approximately 14,218 kbytes can be used as a cache.
Cache segmenting is adjusted dynamically by the disk drive hardware according to the workload being experi-
enced by the drive. The drive is capable of dynamically-adjusting up to 256 segments. The number and sizes
of segments are not user-defined.
The drive keeps track of the logical block addresses of the data stored in each segment of the buffer. If the
cache is enabled (see RCD bit in the Fibre Channel Interface Manual), data requested by the host with a read
command is retrieved from the buffer, if possible, before any disc access is initiated. If cache operation is not
enabled, the buffer is still used, but only as circular buffer segments during disc medium read operations (dis-
regarding Prefetch operation for the moment). That is, the drive does not check in the buffer segments for the
requested read data, but goes directly to the medium to retrieve it. The retrieved data merely passes through
some buffer segment on the way to the host. On a cache miss, all data transfers to the host are in accordance
with buffer-full ratio rules. On a cache hit, the drive ignores the buffer-full ratio rules. See the explanation pro-
vided with the information about Mode Page 02h (disconnect/reconnect control) in the Fibre Channel Interface
Manual.
The following is a simplified description of the prefetch/cache operation:
Case A—read command is received and the first logical block is already in the cache:
1. Drive transfers to the initiator the first logical block requested plus all subsequent contiguous logical blocks
that are already in the cache. This data may be in multiple segments.
2. When a requested logical block is reached that is not in any cache segment, the drive fetches it and any
remaining requested logical block addresses from the disc and puts them in a segment of the cache. The
drive transfers the remaining requested logical blocks from the cache to the host in accordance with the
Mode Select Disconnect/Reconnect parameters, page 02h.
Case B—A Read command requests data, and the first logical block is not in any segment of the cache:
1. The drive fetches the requested logical blocks from the disc and transfers them into a segment, and then
from there to the host in accordance with the Mode Select Disconnect/Reconnect parameters, page 02h.
During a prefetch, the drive crosses a cylinder boundary to fetch data only if the Discontinuity (DISC) bit is set
to 1 in bit 4 of byte 2 of the Mode Select parameters page 08h. Default is zero for bit 4.
Each cache segment is actually a self-contained circular buffer whose length is an integer number of logical
blocks. The sizes of the segments are determined by the drive’s analysis of the current workload.
Note. The size of each segment is not reported by Mode Sense command page 08h, bytes 14 and 15.
The value 0XFFFF is always reported regardless of the actual size of the segment. Sending a size
specification using the Mode Select command (bytes 14 and 15) does not set up a new segment
size. If the STRICT bit in Mode page 00h (byte 2, bit 1) is set to one, the drive responds as it does
for any attempt to change an unchangeable parameter.
Cheetah 15K.4 FC Product Manual, Rev. B
13
4.5.1
Caching write data
Write caching is a write operation by the drive that makes use of a drive buffer storage area where the data to
be written to the medium is stored while the drive performs the Write command.
If read caching is enabled (RCD=0), then data written to the medium is retained in the cache to be made avail-
able for future read cache hits. The same buffer space and segmentation is used as set up for read functions.
The buffer segmentation scheme is set up or changed independently, having nothing to do with the state of
RCD. When a write command is issued, if RCD=0, the cache is first checked to see if any logical blocks that
are to be written are already stored in the cache from a previous read or write command. If there are, the
respective cache segments are cleared. The new data is cached for subsequent Read commands.
If the number of write data logical blocks exceed the size of the segment being written into, when the end of the
segment is reached, the data is written into the beginning of the same cache segment, overwriting the data that
was written there at the beginning of the operation; however, the drive does not overwrite data that has not yet
been written to the medium.
If write caching is enabled (WCE=1), then the drive may return Good status on a write command after the data
has been transferred into the cache, but before the data has been written to the medium. If an error occurs
while writing the data to the medium, and Good status has already been returned, a deferred error will be gen-
erated.
The Synchronize Cache command may be used to force the drive to write all cached write data to the medium.
Upon completion of a Synchronize Cache command, all data received from previous write commands will have
been written to the medium.
Table 18 shows the mode default settings for the drive.
4.5.2
Prefetch operation
If the Prefetch feature is enabled, data in contiguous logical blocks on the disc immediately beyond that which
was requested by a Read command are retrieved and stored in the buffer for immediate transfer from the
buffer to the host on subsequent Read commands that request those logical blocks (this is true even if cache
operation is disabled). Though the prefetch operation uses the buffer as a cache, finding the requested data in
the buffer is a prefetch hit, not a cache operation hit.
To enable Prefetch, use Mode Select page 08h, byte 12, bit 5 (Disable Read Ahead - DRA bit). DRA bit = 0
enables prefetch.
Since data that is prefetched replaces data already in some buffer segments, the host can limit the amount of
prefetch data to optimize system performance. The Max Prefetch field (bytes 8 and 9) limits the amount of
prefetch. The drive does not use the Prefetch Ceiling field (bytes 10 and 11).
When prefetch (read look-ahead) is enabled (enabled by DRA = 0), it operates under the control of ARLA
(Adaptive Read Look-Ahead). If the host uses software interleave, ARLA enables prefetch of contiguous
blocks from the disc when it senses that a prefetch hit will likely occur, even if two consecutive read operations
were not for physically contiguous blocks of data (e.g. “software interleave”). ARLA disables prefetch when it
decides that a prefetch hit will not likely occur. If the host is not using software interleave, and if two sequential
read operations are not for contiguous blocks of data, ARLA disables prefetch, but as long as sequential read
operations request contiguous blocks of data, ARLA keeps prefetch enabled.
4.5.3
Optimizing cache performance for desktop and server applications
Desktop and server applications require different drive caching operations for optimal performance. This
means it is difficult to provide a single configuration that meets both of these needs. In a desktop environment,
you want to configure the cache to respond quickly to repetitive accesses of multiple small segments of data
without taking the time to “look ahead” to the next contiguous segments of data. In a server environment, you
14
Cheetah 15K.4 FC Product Manual, Rev. B
want to configure the cache to provide large volumes of sequential data in a non-repetitive manner. In this
case, the ability of the cache to “look ahead” to the next contiguous segments of sequential data is a good
thing.
The Performance Mode (PM) bit controls the way the drive switches the cache buffer into different modes of
segmentation. In “server mode” (PM bit = 0), the drive can dynamically change the number of cache buffer
segments as needed to optimize the performance, based on the command stream from the host. In “desktop
mode” (PM bit = 1), the number of segments is maintained at the value defined in Mode Page 8, Byte 13, at all
times. For additional information about the PM bit, refer to the Unit Attention Parameters page (00h) of the
Mode Sense command (1Ah) in the Fibre Channel Interface Product Manual, part number 77767496.
Cheetah 15K.4 FC Product Manual, Rev. B
15
16
Cheetah 15K.4 FC Product Manual, Rev. B
5.0
Reliability specifications
The following reliability specifications assume correct host and drive operational interface, including all inter-
face timings, power supply voltages, environmental requirements and drive mounting constraints.
Less than 10 errors in 108 seeks
Seek error rate:
1
Read Error Rates
Less than 10 errors in 1012 bits transferred (OEM default settings)
Less than 1 sector in 1015 bits transferred
Less than 1 sector in 1021 bits transferred
Recovered Data
Unrecovered Data
Miscorrected Data
Less than 1 error in 1012 bits transferred with minimum receive eye.
Less than 1 error in 1014 bits transferred with typical receive eye.
Interface error rate:
MTBF:
1,400,000 hours
None required
Preventive maintenance:
1.
Error rate specified with automatic retries and data correction with ECC enabled and all flaws reallocated.
5.1
Error rates
The error rates stated in this manual assume the following:
• The drive is operated in accordance with this manual using DC power as defined in paragraph 6.2, "DC
• Errors caused by host system failures are excluded from error rate computations.
• Assume random data.
• Default OEM error recovery settings are applied. This includes AWRE, ARRE, full read retries, full write
retries and full retry time.
5.1.1
Recoverable Errors
Recovereable errors are those detected and corrected by the drive, and do not require user intervention.
Recoverable Data errors will use correction, although ECC on-the-fly is not considered for purposes of recov-
ered error specifications.
Recovered Data error rate is determined using read bits transferred for recoverable errors occurring during a
read, and using write bits transferred for recoverable errors occurring during a write.
5.1.2
Unrecoverable Errors
15
Unrecoverable Data Errors (Sense Key = 03h) are specified at less than 1 sector in error per 10 bits trans-
ferred. Unrecoverable Data Errors resulting from the same cause are treated as 1 error for that block.
Cheetah 15K.4 FC Product Manual, Rev. B
17
5.1.3
Seek errors
A seek error is defined as a failure of the drive to position the heads to the addressed track. After detecting an
initial seek error, the drive automatically performs an error recovery process. If the error recovery process fails,
a seek positioning error (Error code = 15h or 02h) will be reported with a Hardware error (04h) in the Sense
8
Key. Recoverable seek errors are specified at Less than 10 errors in 10 seeks. Unrecoverable seek errors
(Sense Key = 04h) are classified as drive failures.
5.1.4
Interface errors
An interface error is defined as a failure of the receiver on a port to recover the data as transmitted by the
device port connected to the receiver. The error may be detected as a running disparity error, illegal code, loss
of word sync, or CRC error. The total error rate for a loop of devices is the sum of the individual device error
rates.
5.2
Reliability and service
You can enhance the reliability of Cheetah K15.4 disc drives by ensuring that the drive receives adequate cool-
ing. Section 6.0 provides temperature measurements and other information that may be used to enhance the
5.2.1
Mean time between failure (MTBF)
The production disc drive achieves an MTBF of 1,400,000 hours when operated in an environment that
ensures the case temperatures specified in Section 6.4.1 are not exceeded. Short-term excursions up to the
specification limits of the operating environment will not affect MTBF performance. Operating the drive at case
temperatures above these values will adversely affect the drive’s ability to meet specifications (see Section 6.4,
The MTBF target is specified as device power-on hours (POH) for all drives in service per failure.
The following expression defines MTBF:
MTBF per measurement period = Estimated power-on operating hours in the period
Number of drive failures in the period
Estimated power-on operating hours means power-on hours per disc drive times the total number of disc
drives in service. Each disc drive must have accumulated at least nine months of operation. Data is calculated
on a rolling average base for a minimum period of six months.
MTBF is based on the following assumptions:
• 8,760 power-on hours per year
• 250 average on/off cycles per year
• Operating at nominal voltages
• System provides adequate cooling to ensure the case temperatures specified in Section 6.4.1 are not
exceeded.
Drive failure means any stoppage or failure to meet defined specifications caused by drive malfunction.
A S.M.A.R.T. predictive failure indicates that the drive is deteriorating to an imminent failure and is considered
an MTBF hit.
5.2.2
Preventive maintenance
No routine scheduled preventive maintenance is required.
18
Cheetah 15K.4 FC Product Manual, Rev. B
5.2.3
Hot plugging the drive
Inserting and removing the drive on the FC-AL will interrupt loop operation. The interruption occurs when the
receiver of the next device in the loop must synchronize to a different input signal. FC error detection mecha-
nisms, character sync, running disparity, word sync, and CRC are able to detect any error. Recovery is initiated
based on the type of error.
The disc drive defaults to the FC-AL Monitoring state, Pass-through state, when it is powered-on by switching
the power or hot plugged. The control line to an optional port bypass circuit (external to the drive), defaults to
the Enable Bypass state. If the bypass circuit is present, the next device in the loop will continue to receive the
output of the previous device to the newly inserted device. If the bypass circuit is not present, loop operation is
temporarily disrupted until the next device starts receiving the output from the newly inserted device and
regains synchronization to the new input.
The Pass-through state is disabled while the drive performs self test of the FC interface. The control line for an
external port bypass circuit remains in the Enable Bypass state while self test is running. If the bypass circuit is
present, loop operation may continue. If the bypass circuit is not present, loop operation will be halted while the
self test of the FC interface runs.
When the self test completes successfully, the control line to the bypass circuit is disabled and the drive enters
the FC-AL Initializing state. The receiver on the next device in the loop must synchronize to output of the newly
inserted drive.
If the self-test fails, the control line to the bypass circuit remains in the Enable Bypass state.
Note. It is the responsibility of the systems integrator to assure that no temperature, energy, voltage haz-
ard, or ESD potential hazard is presented during the hot connect/disconnect operation. Discharge
the static electricity from the drive carrier prior to inserting it into the system.
Caution. The drive motor must come to a complete stop prior to changing the plane of operation. This time is
required to insure data integrity.
5.2.4
S.M.A.R.T.
S.M.A.R.T. is an acronym for Self-Monitoring Analysis and Reporting Technology. This technology is intended
to recognize conditions that indicate imminent drive failure and is designed to provide sufficient warning of a
failure to allow you to back up the data before an actual failure occurs.
Note. The drive’s firmware monitors specific attributes for degradation over time but can’t predict instanta-
neous drive failures.
Each monitored attribute has been selected to monitor a specific set of failure conditions in the operating per-
formance of the drive and the thresholds are optimized to minimize “false” and “failed” predictions.
Controlling S.M.A.R.T.
The operating mode of S.M.A.R.T. is controlled by the DEXCPT and PERF bits on the Informational Exceptions
Control mode page (1Ch). Use the DEXCPT bit to enable or disable the S.M.A.R.T. feature. Setting the DEX-
CPT bit disables all S.M.A.R.T. functions. When enabled, S.M.A.R.T. collects on-line data as the drive performs
normal read and write operations. When the PERF bit is set, the drive is considered to be in “On-line Mode
Only” and will not perform off-line functions.
You can measure off-line attributes and force the drive to save the data by using the Rezero Unit command.
Forcing S.M.A.R.T. resets the timer so that the next scheduled interrupt is in one hour.
You can interrogate the drive through the host to determine the time remaining before the next scheduled mea-
surement and data logging process occurs. To accomplish this, issue a Log Sense command to log page 0x3E.
This allows you to control when S.M.A.R.T. interruptions occur. Forcing S.M.A.R.T. with the RTZ command
resets the timer.
Cheetah 15K.4 FC Product Manual, Rev. B
19
Performance impact
S.M.A.R.T. attribute data is saved to the disc so that the events that caused a predictive failure can be recre-
ated. The drive measures and saves parameters once every two hours subject to an idle period on the FC-AL
bus. The process of measuring off-line attribute data and saving data to the disc is uninterruptable. The maxi-
mum on-line only processing delay is summarized below:
Maximum processing delay
On-line only delay
Fully-enabled delay
DEXCPT = 0, PERF = 1
DEXCPT = 0, PERF = 0
42 milliseconds
S.M.A.R.T. delay times
163 milliseconds
Reporting control
Reporting is controlled by the MRIE bits in the Informational Exceptions Control mode page (1Ch). Subject to
the reporting method, the firmware will issue to the host an 01-5Dxx sense code. The error code is preserved
through bus resets and power cycles.
Determining rate
S.M.A.R.T. monitors the rate at which errors occur and signals a predictive failure if the rate of degraded errors
increases to an unacceptable level. To determine rate, error events are logged and compared to the number of
total operations for a given attribute. The interval defines the number of operations over which to measure the
rate. The counter that keeps track of the current number of operations is referred to as the Interval Counter.
S.M.A.R.T. measures error rates. All errors for each monitored attribute are recorded. A counter keeps track of
the number of errors for the current interval. This counter is referred to as the Failure Counter.
Error rate is the number of errors per operation. The algorithm that S.M.A.R.T. uses to record rates of error is to
set thresholds for the number of errors and their interval. If the number of errors exceeds the threshold before
the interval expires, the error rate is considered to be unacceptable. If the number of errors does not exceed
the threshold before the interval expires, the error rate is considered to be acceptable. In either case, the inter-
val and failure counters are reset and the process starts over.
Predictive failures
S.M.A.R.T. signals predictive failures when the drive is performing unacceptably for a period of time. The firm-
ware keeps a running count of the number of times the error rate for each attribute is unacceptable. To accom-
plish this, a counter is incremented each time the error rate is unacceptable and decremented (not to exceed
zero) whenever the error rate is acceptable. If the counter continually increments such that it reaches the pre-
dictive threshold, a predictive failure is signaled. This counter is referred to as the Failure History Counter.
There is a separate Failure History Counter for each attribute.
5.2.5
Thermal monitor
Cheetah 15K.4 FC drives implement a temperature warning system which:
1. Signals the host if the temperature exceeds a value which would threaten the drive.
2. Signals the host if the temperature exceeds a user-specified value.
3. Saves a S.M.A.R.T. data frame on the drive which exceeds the threatening temperature value.
A temperature sensor monitors the drive temperature and issues a warning over the interface when the tem-
perature exceeds a set threshold. The temperature is measured at power-up and then at ten-minute intervals
after power-up.
20
Cheetah 15K.4 FC Product Manual, Rev. B
The thermal monitor system generates a warning code of 01-0B01 when the temperature exceeds the speci-
fied limit in compliance with the SCSI standard. The drive temperature is reported in the FRU code field of
mode sense data. You can use this information to determine if the warning is due to the temperature exceeding
the drive threatening temperature or the user-specified temperature.
This feature is controlled by the Enable Warning (EWasc) bit, and the reporting mechanism is controlled by the
Method of Reporting Informational Exceptions field (MRIE) on the Informational Exceptions Control (IEC)
mode page (1Ch).
The current algorithm implements two temperature trip points. The first trip point is set at 65°C which is the
maximum temperature limit according to the drive specification. The second trip point is user-selectable using
the Log Select command. The reference temperature parameter in the temperature log page (see Table 1) can
be used to set this trip point. The default value for this drive is 65°C, however, you can set it to any value in the
range of 0 to 65°C. If you specify a temperature greater than 65°C in this field, the temperature is rounded
down to 65°C. A sense code is sent to the host to indicate the rounding of the parameter field.
Table 1:
Temperature Log Page (0Dh)
Parameter Code
Description
Primary Temperature
Reference Temperature
0000h
0001h
5.2.6
Drive Self Test (DST)
Drive Self Test (DST) is a technology designed to recognize drive fault conditions that qualify the drive as a
failed unit. DST validates the functionality of the drive at a system level.
There are two test coverage options implemented in DST:
1. Extended test
2. Short text
The most thorough option is the extended test that performs various tests on the drive and scans every logical
block address (LBA) of the drive. The short test is time-restricted and limited in length—it does not scan the
entire media surface, but does some fundamental tests and scans portions of the media.
If DST encounters an error during either of these tests, it reports a fault condition. If the drive fails the test,
remove it from service and return it to Seagate for service.
5.2.6.1
DST failure definition
The drive will present a “diagnostic failed” condition through the self-tests results value of the diagnostic log
page if a functional failure is encountered during DST. The channel and servo parameters are not modified to
test the drive more stringently, and the number of retries are not reduced. All retries and recovery processes
are enabled during the test. If data is recoverable, no failure condition will be reported regardless of the number
of retries required to recover the data.
The following conditions are considered DST failure conditions:
• Seek error after retries are exhausted
• Track-follow error after retries are exhausted
• Read error after retries are exhausted
• Write error after retries are exhausted
Recovered errors will not be reported as diagnostic failures.
Cheetah 15K.4 FC Product Manual, Rev. B
21
5.2.6.2
Implementation
This section provides all of the information necessary to implement the DST function on this drive.
5.2.6.2.1
State of the drive prior to testing
The drive must be in a ready state before issuing the Send Diagnostic command. There are multiple reasons
why a drive may not be ready, some of which are valid conditions, and not errors. For example, a drive may be
in process of doing a format, or another DST. It is the responsibility of the host application to determine the “not
ready” cause.
While not technically part of DST, a Not Ready condition also qualifies the drive to be returned to Seagate as a
failed drive.
A Drive Not Ready condition is reported by the drive under the following conditions:
• Motor will not spin
• Motor will not lock to speed
• Servo will not lock on track
• Drive cannot read configuration tables from the disc
In these conditions, the drive responds to a Test Unit Ready command with an 02/04/00 or 02/04/03 code.
5.2.6.2.2
Invoking DST
To invoke DST, submit the Send Diagnostic command with the appropriate Function Code (001b for the short
test or 010b for the extended test) in bytes 1, bits 5, 6, and 7.
5.2.6.2.3
Short and extended tests
DST has two testing options:
1. short
2. extended
These testing options are described in the following two subsections.
Each test consists of three segments: an electrical test segment, a servo test segment, and a read/verify scan
segment.
Short test (Function Code: 001b)
The purpose of the short test is to provide a time-limited test that tests as much of the drive as possible within
120 seconds. The short test does not scan the entire media surface, but does some fundamental tests and
scans portions of the media. A complete read/verify scan is not performed and only factual failures will report a
fault condition. This option provides a quick confidence test of the drive.
Extended test (Function Code: 010b)
The objective of the extended test option is to empirically test critical drive components. For example, the seek
tests and on-track operations test the positioning mechanism. The read operation tests the read head element
and the media surface. The write element is tested through read/write/read operations. The integrity of the
media is checked through a read/verify scan of the media. Motor functionality is tested by default as a part of
these tests.
The anticipated length of the Extended test is reported through the Control Mode page.
22
Cheetah 15K.4 FC Product Manual, Rev. B
5.2.6.2.4
Log page entries
When the drive begins DST, it creates a new entry in the Self-test Results Log page. The new entry is created
by inserting a new self-test parameter block at the beginning of the self-test results log parameter section of the
log page. Existing data will be moved to make room for the new parameter block. The drive reports 20 param-
eter blocks in the log page. If there are more than 20 parameter blocks, the least recent parameter block will be
deleted. The new parameter block will be initialized as follows:
1. The Function Code field is set to the same value as sent in the DST command
2. The Self-Test Results Value field is set to Fh
3. The drive will store the log page to non-volatile memory
After a self-test is complete or has been aborted, the drive updates the Self-Test Results Value field in its Self-
Test Results Log page in non-volatile memory. The host may use Log Sense to read the results from up to the
last 20 self-tests performed by the drive. The self-test results value is a 4-bit field that reports the results of the
test. If the field is set to zero, the drive passed with no errors detected by the DST. If the field is not set to zero,
the test failed for the reason reported in the field.
The drive will report the failure condition and LBA (if applicable) in the Self-test Results Log parameter. The
Sense key, ASC, ASCQ, and FRU are used to report the failure condition.
5.2.6.2.5
Abort
There are several ways to abort a diagnostic. You can use a SCSI Bus Reset or a Bus Device Reset message
to abort the diagnostic.
You can abort a DST executing in background mode by using the abort code in the DST Function Code field.
This will cause a 01 (self-test aborted by the application client) code to appear in the self-test results values
log. All other abort mechanisms will be reported as a 02 (self-test routine was interrupted by a reset condition).
5.2.7
Product warranty
Beginning on the date of shipment to the customer and continuing for the period specified in your purchase
contract, Seagate warrants that each product (including components and subassemblies) that fails to function
properly under normal use due to defect in materials or workmanship or due to nonconformance to the applica-
ble specifications will be repaired or replaced, at Seagate’s option and at no charge to the customer, if returned
by customer at customer’s expense to Seagate’s designated facility in accordance with Seagate’s warranty
procedure. Seagate will pay for transporting the repair or replacement item to the customer. For more detailed
warranty information, refer to the standard terms and conditions of purchase for Seagate products on your pur-
chase documentation.
The remaining warranty for a particular drive can be determined by calling Seagate Customer Service at
1-800-468-3472. You can also determine remaining warranty using the Seagate web site (www.seagate.com).
The drive serial number is required to determine remaining warranty information.
Shipping
When transporting or shipping a drive, use only a Seagate-approved container. Keep your original box.
Seagate approved containers are easily identified by the Seagate Approved Package label. Shipping a drive in
a non-approved container voids the drive warranty.
Seagate repair centers may refuse receipt of components improperly packaged or obviously damaged in tran-
sit. Contact your authorized Seagate distributor to purchase additional boxes. Seagate recommends shipping
by an air-ride carrier experienced in handling computer equipment.
Cheetah 15K.4 FC Product Manual, Rev. B
23
Product repair and return information
Seagate customer service centers are the only facilities authorized to service Seagate drives. Seagate does
not sanction any third-party repair facilities. Any unauthorized repair or tampering with the factory seal voids
the warranty.
24
Cheetah 15K.4 FC Product Manual, Rev. B
6.0
Physical/electrical specifications
This section provides information relating to the physical and electrical characteristics of the drive.
6.1
AC power requirements
None.
6.2
DC power requirements
The voltage and current requirements for a single drive are sh‘own below. Values indicated apply at the drive
connector.
Table 2:
DC power requirements for ST3146954FC drives
1 Gbit mode
2 Gbit mode
(Amps)
+5V
4 Gbit mode
Notes (Amps)
(Amps)
(Amps)
+12V [2]
±5% [2]
0.78
(Amps)
+5V
(Amps)
Voltage
+5V
+12V [2]
±5% [2]
0.78
+12V [2]
±5% [2]
0.79
Regulation
[5]
±5%
0.62
±5%
±5%
Avg idle current DCX
Maximum starting current
(peak DC) DC
(peak AC) AC
[1] [7]
0.66
0.70
3σ [3]
3σ [3]
0.83
0.99
0.55
1.89
4.01
0.04
0.93
1.13
0.59
1.89
4.00
0.04
0.80
1.08
0.69
1.86
3.18
0.04
Delayed motor start (max) DC 3σ [1] [4]
Peak operating current:
Typical DCX
[1] [6]
3σ [1]
3σ
0.81
0.83
1.28
0.90
0.92
3.04
1.01
1.26
1.26
0.88
0.89
3.02
0.74
0.76
1.24
1.04
1.18
2.92
Maximum DC
Maximum (peak) DC
Cheetah 15K.4 FC Product Manual, Rev. B
25
Table 3:
DC power requirements for ST373554FC drives
1 Gbit mode
2 Gbit mode
(Amps)
+5V
4 Gbit mode
Notes (Amps)
(Amps)
(Amps)
+12V [2]
±5% [2]
0.56
(Amps)
+5V
(Amps)
Voltage
+5V
+12V [2]
±5% [2]
0.57
+12V [2]
±5% [2]
0.57
Regulation
[5]
±5%
0.62
±5%
±5%
Avg idle current DCX
Maximum starting current
(peak DC) DC
(peak AC) AC
[1] [7]
0.66
0.69
3σ [3]
3σ [3]
0.83
0.98
0.54
1.88
4.08
0.03
0.94
1.11
0.58
1.85
4.08
0.04
0.77
1.17
0.70
1.71
2.94
0.04
Delayed motor start (max) DC 3σ [1] [4]
Peak operating current:
Typical DCX
[1] [6]
3σ [1]
3σ
0.79
0.82
1.27
1.01
1.03
2.82
0.90
1.18
1.24
0.66
0.67
2.98
0.76
0.77
1.30
0.79
0.80
2.82
Maximum DC
Maximum (peak) DC
Table 4:
DC power requirements for ST336854FC drives
1 Gbit mode
2 Gbit mode
(Amps)
+5V
4 Gbit mode
(Amps)
+5V
Notes (Amps)
(Amps)
(Amps)
+12V [2]
±5% [2]
0.43
(Amps)
+12V [2]
±5% [2]
0.43
Voltage
+5V
+12V [2]
±5% [2]
0.43
Regulation
[5]
±5%
0.62
±5%
±5%
Avg idle current DCX
Maximum starting current
(peak DC) DC
(peak AC) AC
[1] [7]
0.66
0.69
3σ [3]
3σ [3]
0.83
0.99
0.55
1.59
3.43
0.03
0.93
1.11
0.58
1.58
3.30
0.03
0.98
1.16
0.62
1.59
3.36
0.03
Delayed motor start (max) DC 3σ [1] [4]
Peak operating current:
Typical DCX
[1] [6]
3σ [1]
3σ
0.77
0.81
1.26
0.87
0.89
2.64
0.81
0.85
1.31
0.86
0.88
2.54
0.84
0.88
1.35
0.87
0.88
2.59
Maximum DC
Maximum (peak) DC
[1] Measured with average reading DC ammeter. Instantaneous +12V current peaks will exceed these val-
ues. Power supply at nominal voltage. N (number of drives tested) = 6, 35 Degrees C ambient.
[2] For +12 V, a –10% tolerance is allowed during initial spindle start but must return to ±5% before reaching
14,904 RPM. The ±5% must be maintained after the drive signifies that its power-up sequence has been
completed and that the drive is able to accept selection by the host initiator.
[4] This condition occurs when the Motor Start option is enabled and the drive has not yet received a Start
Motor command.
[5] See paragraph 6.2.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and
transient response.
[6] Operating condition is defined as random 8 block reads at 225 I/Os per second for ST3146954FC models
26
Cheetah 15K.4 FC Product Manual, Rev. B
and 230 I/Os per second for ST373554FC andST336854FC models. Current and power specified at nom-
inal voltages. Decreasing +5 volt supply by 5% increases 5 volt current by 2.5%. Decreasing +12 volt sup-
ply by 5% increases 12 volt current by 3.0% (2% for ST373554FC and ST336854FC models).
[7] During idle, the drive heads are relocated every 60 seconds to a random location within the band from
three-quarters to maximum track.
General DC power requirement notes.
1. Minimum current loading for each supply voltage is not less than 1.2% of the maximum operating current
shown.
2. The +5V and +12V supplies should employ separate ground returns.
3. Where power is provided to multiple drives from a common supply, careful consideration for individual
drive power requirements should be noted. Where multiple units are powered on simultaneously, the peak
starting current must be available to each device.
4. Parameters, other than spindle start, are measured after a 10-minute warm up.
5. No terminator power.
6.2.1
Conducted noise immunity
Noise is specified as a periodic and random distribution of frequencies covering a band from DC to 10 MHz.
Maximum allowed noise values given below are peak-to-peak measurements and apply at the drive power
connector.
+5 V = 250 mV pp from 0 to 100 kHz to 20 MHz.
+12 V = 800 mV pp from 100 Hz to 8 KHz.
450 mV pp from 8 KHz to 20 KHz.
250 mV pp from 20 KHz to 5 MHz.
6.2.2
Power sequencing
The drive does not require power sequencing. The drive protects against inadvertent writing during power-up
and down.
6.2.3
Current profiles
The +12V and +5V current profiles for the ST3146954FC, ST373554FC, and ST336854FC models are shown
below in the following figures.
Note: All times and currents are typical. See Table 2 for maximum current requirements.
Cheetah 15K.4 FC Product Manual, Rev. B
27
6.3
Power dissipation
ST3146954FC
Typical power dissipation under idle conditions in 2Gb operation is 13.96 watts (47.6 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure
8). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5
volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by
3.4123.
ST3146854FC DC CURRENT/POWER vs THROUGHPUT (2 Gb)
Random 8 Block Reads
1. 8 0 0
1. 6 0 0
1. 4 0 0
1. 2 0 0
1. 0 0 0
0.800
0.600
0.400
20.00
18 . 0 0
16 . 0 0
14 . 0 0
12 . 0 0
10 . 0 0
8.00
5Volt A
12 V o l t A
Watts
6.00
4.00
0.0
50.0
100.0
150.0
200.0
250.0
300.0
350.0
400.0
I/Os per Second
Figure 8.
ST3146954FC DC current and power vs. input/output operations per second
Cheetah 15K.4 FC Product Manual, Rev. B
31
ST373554FC
Typical power dissipation under idle conditions in 2Gb operation is 11.49 watts (39.21 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure
8). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5
volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by
3.4123.
ST373454Specification random 8 block read, 2Gb
1. 8 0 0
1. 6 0 0
1. 4 0 0
1. 2 0 0
1. 0 0 0
0.800
0.600
0.400
0.200
0.000
18 . 0 0
16 . 0 0
14 . 0 0
12 . 0 0
10 . 0 0
8.00
6.00
4.00
2.00
0.00
5Volt A
12 V o l t A
Watts
0.0
50.0
100.0
150.0
200.0
250.0
300.0
350.0
400.0
I/Os per Second
Figure 9.
ST373554FC DC current and power vs. input/output operations per second
32
Cheetah 15K.4 FC Product Manual, Rev. B
ST336854FC
Typical power dissipation under idle conditions in 2Gb operation is 9.88 watts (33.7 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure
8). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5
volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by
3.4123.
ST336754FC Specification random 8 block read
1. 8 0 0
1. 6 0 0
1. 4 0 0
1. 2 0 0
1. 0 0 0
0.800
0.600
0.400
0.200
0.000
18 . 0 0
16 . 0 0
14 . 0 0
12 . 0 0
10 . 0 0
8.00
6.00
4.00
2.00
0.00
5Volt A
12 V o lt A
Watts
0.0
50.0
100.0
150.0
200.0
250.0
300.0
350.0
400.0
I/Os per Second
Figure 10.
ST336854FC DC current and power vs. input/output operations per second
Cheetah 15K.4 FC Product Manual, Rev. B
33
6.4
Environmental limits
Temperature and humidity values experienced by the drive must be such that condensation does not occur on
any drive part. Altitude and atmospheric pressure specifications are referenced to a standard day at 58.7°F
(14.8°C). Maximum wet bulb temperature is 82°F (28°C).
6.4.1
Temperature
a. Operating
The maximum allowable continuous or sustained HDA case temperature for the rated MTBF is 122°F
(50°C) The maximum allowable HDA case temperature is 60°C. Occasional excursions of HDA case tem-
peratures above 122°F (50°C) or below 41°F (5°C) may occur without impact to specified MTBF. Continual
or sustained operation at HDA case temperatures outside these limits may degrade MTBF.
Provided the HDA case temperatures limits are met, the drive meets all specifications over a 41°F to 131°F
(5°C to 55°C) drive ambient temperature range with a maximum temperature gradient of 36°F (20°C) per
hour. Air flow may be needed in the drive enclosure to keep within this range (see Section 8.3). Operation at
HDA case temperatures outside this range may adversely affect the drives ability to meet specifications. To
confirm that the required cooling for the electronics and HDA case is provided, place the drive in its final
mechanical configuration, perform random write/read operations and measure the HDA case temperature
after it has stabilized.
b. Non-operating
–40° to 158°F (–40° to 70°C) package ambient with a maximum gradient of 36°F (20°C) per hour. This
specification assumes that the drive is packaged in the shipping container designed by Seagate for use with
drive.
HDA Temp.
Check Point
1
.0"
.5"
Figure 11. Locations of the HDA temperature check point
6.4.2 Relative humidity
The values below assume that no condensation on the drive occurs.
a. Operating
5% to 95% non-condensing relative humidity with a maximum gradient of 20% per hour.
b. Non-operating
5% to 95% non-condensing relative humidity.
34
Cheetah 15K.4 FC Product Manual, Rev. B
6.4.3
Effective altitude (sea level)
a. Operating
–1,000 to +10,000 feet (–305 to +3,048 meters)
b. Non-operating
–1,000 to +40,000 feet (–305 to +12,210 meters)
6.4.4
Shock and vibration
Shock and vibration limits specified in this document are measured directly on the drive chassis. If the drive is
installed in an enclosure to which the stated shock and/or vibration criteria is applied, resonances may occur
internally to the enclosure resulting in drive movement in excess of the stated limits. If this situation is apparent,
it may be necessary to modify the enclosure to minimize drive movement.
The limits of shock and vibration defined within this document are specified with the drive mounted by any of
the four methods shown in Figure 12, and in accordance with the restrictions of Section 8.5. Orientation of the
side nearest the LED may be up or down.
6.4.4.1
Shock
a. Operating—normal
The drive, as installed for normal operation, shall operate error free while subjected to intermittent shock not
exceeding 15 Gs at a maximum duration of 11 msec (half sinewave). The drive, as installed for normal
operation, shall operate error free while subjected to intermittent shock not exceeding 65 Gs at a maximum
duration of 2 msec (half sinewave). Shock may be applied in the X, Y, or Z axis.
b. Operating—abnormal
Equipment, as installed for normal operation, does not incur physical damage while subjected to intermit-
tent shock not exceeding 40 Gs at a maximum duration of 11 msec (half sinewave). Shock occurring at
abnormal levels may promote degraded operational performance during the abnormal shock period. Speci-
fied operational performance will continue when normal operating shock levels resume. Shock may be
applied in the X, Y, or Z axis. Shock is not to be repeated more than two times per second.
c. Non-operating
The limits of non-operating shock shall apply to all conditions of handling and transportation. This includes
both isolated drives and integrated drives.
The drive subjected to nonrepetitive shock not exceeding 75 Gs at a maximum duration of 11 msec (half
sinewave) shall not exhibit device damage or performance degradation. Shock may be applied in the X, Y,
or Z axis.
The drive subjected to nonrepetitive shock not exceeding 250 Gs at a maximum duration of 2 msec (half
sinewave) does not exhibit device damage or performance degradation. Shock may be applied in the X, Y,
or Z axis.
The drive subjected to nonrepetitve shock not exceeding 100 Gs at a maximum duration of 0.5 msec (half
sinewave) does not exhibit device damage or performance degradation. Shock may be applied in the X, Y,
or Z axis.
Cheetah 15K.4 FC Product Manual, Rev. B
35
d. Packaged
Disc drives shipped as loose load (not palletized) general freight will be packaged to withstand drops from
heights as defined in the table below. For additional details refer to Seagate specifications 30190-001
(under 100 lbs/45 kg) or 30191-001 (over 100 lbs/45 Kg).
Package size
Packaged/product weight
Any
Drop height
<600 cu in (<9,800 cu cm)
600-1800 cu in (9,800-19,700 cu cm)
>1800 cu in (>19,700 cu cm)
>600 cu in (>9,800 cu cm)
60 in (1524 mm)
48 in (1219 mm)
42 in (1067 mm)
36 in (914 mm)
0-20 lb (0 to 9.1 kg)
0-20 lb (0 to 9.1 kg)
20-40 lb (9.1 to 18.1 kg)
Drives packaged in single or multipacks with a gross weight of 20 pounds (8.95 kg) or less by Seagate for
general freight shipment shall withstand a drop test from 48 inches (1,070 mm) against a concrete floor or
equivalent.
Z
X
Y
X
Z
Y
Figure 12. Recommended mounting
36
Cheetah 15K.4 FC Product Manual, Rev. B
6.4.4.2
Vibration
a. Operating—normal
The drive as installed for normal operation, shall comply with the complete specified performance while
subjected to continuous vibration not exceeding
5-500 Hz @ 0.5 G (zero to peak)
Vibration may be applied in the X, Y, or Z axis.
Operating normal translational random flat profile
10 - 400 Hz
0.4 g RMS
b. Operating—abnormal
Equipment as installed for normal operation shall not incur physical damage while subjected to periodic
vibration not exceeding:
15 minutes of duration at major resonant frequency
5-500 Hz @ 0.75 G (X, Y, or Z axis)
Vibration occurring at these levels may degrade operational performance during the abnormal vibration
period. Specified operational performance will continue when normal operating vibration levels are
resumed. This assumes system recovery routines are available.
Operating abnormal translational random flat profile
10 - 400 Hz
1.2 g RMS
c. Non-operating
The limits of non-operating vibration shall apply to all conditions of handling and transportation. This
includes both isolated drives and integrated drives.
The drive shall not incur physical damage or degraded performance as a result of continuous vibration not
exceeding
5-22 Hz @ 0.040 inches (1.02 mm) displacement (zero to peak)
22-500 Hz @ 2.00 G (zero to peak)
Vibration may be applied in the X, Y, or Z axis.
Non-operating translational random flat profile
10 - 400 Hz
1.2 g RMS
6.4.5
Air cleanliness
The drive is designed to operate in a typical office environment with minimal environmental control.
6.4.6
Acoustics
Sound power during idle mode shall be 3.6 bels typical when measured to ISO 7779 specification.
There will not be any discrete tones more than 10 dB above the masking noise on typical drives when mea-
sured according to Seagate specification 30553-001. There will not be any tones more than 24 dB above the
masking noise on any drive.
6.4.7
Electromagnetic susceptibility
Cheetah 15K.4 FC Product Manual, Rev. B
37
6.5
Mechanical specifications
The following nominal dimensions are exclusive of the decorative front panel accessory. However, dimensions
of the front panel are shown in figure below. Refer to Figure 13 for detailed mounting configuration dimensions.
Height:
Width:
Depth:
Weight:
1.000 in
4.000 in
5.75 in
25.4 mm
101.6 mm
146.05 mm
0.68 kilograms
1.5 pounds
B
J
H
L
K
// T -Z-
REF
S
-Z-
[1]
R REF
Notes:
[1]
N -X-
Mounting holes are 6-32 UNC 2B, three
on each side and four on the bottom.
Max screw penetration into side of drive
is 0.15 in. (3.81 mm). Max screw
tightening torque is 6.0 in-lb (3.32 nm)
with minimum full thread engagement of
0.12 in. (3.05 mm).
A
-Z-
C
M
-X-
U -X-
Dimension Table
Inches
Millimeters
P
A
B
C
D
E
F
H
J
K
L
M
N
P
R
S
T
1.028 max
5.787 max
4.000 ± .010
3.750 ± .010
0.125 ± .010
1.750 ± .010
1.122 ± .020
4.000 ± .010
0.250 ± .010
1.638 ± .010
0.181
.040
1.625 ± .020
1.618
0.276 ± .040
.015 max
.015 max
26.10 max
147.00 max
101.60 ± .25
95.25 ± .25
3.18 ± .25
44.45 ± .25
28.50 ± .50
101.60 ± .25
6.35 ± .25
41.60 ± .25
4.60
1.02
41.28 ± .50
41.10
7.00 ± 1.02
0.38 max
0.38 max
F
[1]
U
E
D
Figure 13. Mounting configuration dimensions
38
Cheetah 15K.4 FC Product Manual, Rev. B
7.0
Defect and error management
The drive, as delivered, complies with this product manual. The read error rates and specified storage capaci-
ties are not dependent upon use of defect management routines by the host (initiator).
Defect and error management in the SCSI protocol involves the drive internal defect/error management and
FC-AL system error considerations (errors in communications between the initiator and the drive). Tools for
use in designing a defect/error management plan are briefly outlined in this section. References to other sec-
tions are provided when necessary.
7.1
Drive internal defects/errors
During the initial drive format operation at the factory, media defects are identified, tagged as being unusable,
and their locations recorded on the drive primary defects list (referred to as the “P’ list and also as the ETF
defect list). At factory format time, these known defects are also reallocated, that is, reassigned to a new place
on the medium and the location listed in the defects reallocation table. The “P” list is not altered after factory
formatting. Locations of defects found and reallocated during error recovery procedures after drive shipment
are listed in the “G” list (defects growth list). The “P” and “G” lists may be referenced by the initiator using the
Read Defect Data command.
Details of the SCSI commands supported by the drive are described in the Fibre Channel Interface Manual.
Also, more information on the drive Error Recovery philosophy is presented in the Fibre Channel Interface
Manual.
7.2
Drive error recovery procedures
When an error occurs during drive operation, the drive, if programmed to do so, performs error recovery proce-
dures to attempt to recover the data. The error recovery procedures used depend on the options previously set
in the Error Recovery Parameters mode page. Error recovery and defect management may involve using sev-
eral SCSI commands described in the Fibre Channel Interface Manual. The drive implements selectable error
recovery time limits required in video applications.
The error recovery scheme supported by the drive provides a way to control the total error recovery time for the
entire command in addition to controlling the recovery level for a single LBA. The total amount of time spent in
error recovery for a command can be limited using the Recovery Time Limit bytes in the Error Recovery mode
page. The total amount of time spent in error recovery for a single LBA can be limited using the Read Retry
Count or Write Retry Count bytes in the Error Recovery mode page.
The drive firmware error recovery algorithms consists of 11 levels for read recoveries and five levels for write.
Each level may consist of multiple steps, where a step is defined as a recovery function involving a single re-
read or re-write attempt. The maximum level used by the drive in LBA recovery is determined by the read and
write retry counts.
Cheetah 15K.4 FC Product Manual, Rev. B
39
Table 5 equates the read and write retry count with the maximum possible recovery time for read and write
recovery of individual LBAs. The times given do not include time taken to perform reallocations. Reallocations
are performed when the ARRE bit (for reads) or AWRE bit (for writes) is one, the RC bit is zero, and the recov-
ery time limit for the command has not yet been met. Time needed to perform reallocation is not counted
against the recovery time limit.
When the RC bit is one, reallocations are disabled even if the ARRE or AWRE bits are one. The drive will still
perform data recovery actions within the limits defined by the Read Retry Count, Write Retry Count, and
Recovery Time Limit parameters. However, the drive does not report any unrecovered errors.
40
Cheetah 15K.4 FC Product Manual, Rev. B
Table 5:
Read and write retry count maximum recovery times [1]
Read retry
count
Maximum recovery time per LBA
(cumulative, msec)
Write retry Maximum recovery time per LBA
count
(cumulative, msec)
0
51.87
0
23.94
1
59.85
1
35.91
2
203.49
235.41
271.32
283.29
315.21
395.01
454.86
486.78
522.69
1,264.83
2
55.86
3
3
67.83
4
4
119.7
5
5 (default)
147.63
6
7
8
9
10
11 (default)
[1] These values are subject to change.
Setting these retry counts to a value below the default setting could result in an increased unrecovered
error rate which may exceed the value given in this product manual. A setting of zero (0) will result in the
drive not performing error recovery.
For example, suppose the Read/Write Recovery page has the RC bit set to 0, read retry count set to 4,
and the recovery time limit field (Mode Sense page 01, bytes 10 and 11) set to FF FF hex (maximum). A
four LBA Read command is allowed to take up to 271.32 msec recovery time for each of the four LBAs in
the command. If the recovery time limit is set to 00 C8 hex (200 msec decimal) a four LBA read command
is allowed to take up to 200 msec for all error recovery within that command. The use of the Recovery
Time Limit field allows finer granularity on control of the time spent in error recovery. The recovery time
limit only starts counting when the drive is executing error recovery and it restarts on each command.
Therefore, each command’s total recovery time is subject to the recovery time limit. Note: A recovery time
limit of 0 will use the drive’s default value of FF FF. Minimum recovery time limit is achieved by setting the
Recovery Time Limit field to 00 01.
7.3
FC-AL system errors
Information on the reporting of operational errors or faults across the interface is given in the Fibre Channel
Interface Manual. The FCP Response returns information to the host about numerous kinds of errors or faults.
The Receive Diagnostic Results reports the results of diagnostic operations performed by the drive.
Status returned by the drive to the initiator is described in the Fibre Channel Interface Manual. Status reporting
plays a role in systems error management and its use in that respect is described in sections where the various
commands are discussed.
Cheetah 15K.4 FC Product Manual, Rev. B
41
7.4
Background Media Scan
Background Media Scan (BGMS) is a self-initiated media scan. It performs sequential reads across the entire
pack of the media while the drive is idle. In RAID arrays, BGMS allows hot spare drives to be scanned for
defects prior to being put into service by the host system. On regular duty drives, if the host system makes use
of the BGMS Log Page, it can avoid placing data in suspect locations on the media. Unrecovered error sites
found during BGMS will be logged and recovered error sites will be logged or reallocated per ARRE/AWRE
settings.
With BGMS, the host system can consume less power and system overhead by only checking BGMS status/
results rather than tying up the bus and consuming power in the process of host-initiated media scanning activ-
ity.
Since the background scan functions are only done during idle periods, BGMS causes a negligible impact to
system performance. Background media scan will begin after 500ms of idle time. Other features that normally
use idle time to function will function normally because BGMS functions for bursts of 800ms and then sus-
pends activity to allow other background functions to operate. Additionally, BGMS operates in segments of 400
block reads, checking for host commands upon completion of each of the block segments.
The BGMS function will complete any BGMS-initiated error recovery prior to returning to service host-initiated
commands. Overhead associated with a return to host-servicing activity from BGMS only impacts the first com-
mand that interrupted BGMS. This results in a typical delay of about 4 ms.
7.4.1
Media Pre-Scan
Media Pre-Scan is an optional feature that allows the drive to handle unrecovered media errors that would oth-
erwise have been found by the host system during critical data accesses early in the integration process at
customer sites. This should reduce integration DPPM (defective parts per million) by identifying and repairing
media errors that arose during shipping and handling. Media Pre-Scan replaces all host-initiated Write com-
mands with Write-Verify commands when the drive is accessing areas of the media yet untouched by BGMS-
initiated scanning activity.
The drive will attempt to run BGMS on the entire pack of the drive. This will result in increasingly large portions
of the drive having been accessed, provided there is adequate idle time to allow BGMS to run. During the Pre-
Scan period, all Write commands that are in areas not yet scanned by BGMS are converted to Write-Verify
commands. To expedite the scan of the full pack and the subsequently exit from the Pre-Scan period, BGMS
will begin immediately when the drive goes to idle during the Pre-Scan period, as opposed to waiting 500ms as
is done under non-Pre-Scan conditions.
42
Cheetah 15K.4 FC Product Manual, Rev. B
8.0
Installation
Cheetah 15K.4 FC disc drive installation is a plug-and-play process. There are no jumpers, switches, or termi-
nators on the drive. Simply plug the drive into the host’s 40-pin Fibre Channel backpanel connector (FC-
Use the FC-AL interface to select drive ID and all option configurations for devices on the loop.
If multiple devices are on the same FC-AL and physical addresses are used, set the device selection IDs (SEL
IDs) on the backpanel so that no two devices have the same selection ID. This is called the hard assigned arbi-
trated loop physical address (AL_PA). There are 125 AL_PAs available (see Table 27). If you set the AL_PA on
the backpanel to any value other than 0, the device plugged into the backpanel’s SCA connector inherits this
AL_PA. In the event you don’t successfully assign unique hard addresses (and therefore have duplicate selec-
tion IDs assigned to two or more devices), the FC-AL generates a message indicating this condition. If you set
the AL_PA on the backpanel to a value of 0, the system issues a unique soft-assigned physical address auto-
matically.
Loop initialization is the process used to verify or obtain an address. The loop initialization process is per-
formed when power is applied to the drive, when a device is added or removed from the Fibre Channel loop, or
when a device times out attempting to win arbitration.
• Set all option selections in the connector prior to applying power to the drive. If you change options after
applying power to the drive, recycle the drive power to activate the new settings.
• It is not necessary to low-level format this drive. The drive is shipped from the factory low-level formatted in
512-byte logical blocks. You need to reformat the drive only if you want to select a different logical block size.
8.1
Drive ID/option selection
All drive options are made through the interface connector (J1). Table provides the pin descriptions for the 40-
pin Fibre Channel single connector (J1).
Cheetah 15K.4 FC Product Manual, Rev. B
43
8.2
LED connections
A connector, J6, is provided on the printed circuit board assembly (PCBA) to provide port bypass, drive active,
and drive fault LED connections (see Figure 15). See Sections 9.5.7, 9.5.8, and 9.5.9 for descriptions of LED
functions.
J6
Figure 14.
Physical interface
Drive
Front
Pin 1
J6
Reserved
Port A Bypass LED [1]
Port B Bypass LED [1]
Fault LED [1]
Reserved
Active LED [2]
Reserved
+5V
Active LED [1]
Ground [3]
[1] The drive has a 2.2K ohm resistor in series with this LED driver. Tie the minus side of an external high-effi-
ciency LED (i.e., 2ma) to this pin. Connect the plus side of the LED to +5V.
[2] An external current-limiting resistor is required when connecting an LED to this pin. The minus side of the
resistor/LED combination is connected to this pin. Connect the plus side to +5V.
[3] Jumper storage location (across pins 2 and 4).
Figure 15.
LED indicator connector
44
Cheetah 15K.4 FC Product Manual, Rev. B
8.2.1
J6 connector requirements
Recommended mating connector part number: Berg receptacle, 6-position, Berg part number 690-006.
8.3
Drive orientation
The drive may be mounted in any orientation. All drive performance characterizations, however, have been
done with the drive in horizontal (discs level) and vertical (drive on its side) orientations, which are the two pre-
ferred mounting orientations.
8.4
Cooling
The host enclosure must dissipate heat from the drive. You should confirm that the host enclosure is designed
to ensure that the drive operates within the temperature measurement guidelines described in Section 6.4.1. In
some cases, forced airflow may be required to keep temperatures at or below the temperatures specified in
If forced air is necessary, possible air-flow patterns are shown in Figure 16. The air-flow patterns are created
by fans either forcing or drawing air as shown in the illustrations. Conduction, convection, or other forced air-
flow patterns are acceptable as long as the temperature measurement guidelines of Section 6.4.1 are met.
Above unit
Under unit
Note. Air flows in the direction shown (back to front)
or in reverse direction (front to back)
Above unit
Under unit
Note. Air flows in the direction shown or
in reverse direction (side to side)
Figure 16.
Air flow
Cheetah 15K.4 FC Product Manual, Rev. B
45
8.5
Drive mounting
Mount the drive using the bottom or side mounting holes. If you mount the drive using the bottom holes, ensure
that you do not physically distort the drive by attempting to mount it on a stiff, non-flat surface.
The allowable mounting surface stiffness is 80 lb/in (14.0 N/mm). The following equation and paragraph define
the allowable mounting surface stiffness:
K x X = F < 15lb = 67N
where K is the mounting surface stiffness (units in lb/in or N/mm) and X is the out-of-plane surface distortion
(units in inches or millimeters). The out-of-plane distortion (X) is determined by defining a plane with three of
the four mounting points fixed and evaluating the out-of-plane deflection of the fourth mounting point when a
known force (F) is applied to the fourth point.
Note. Before mounting the drive in any kind of 3.5-inch to 5.25-inch adapter frame, verify with Seagate
Technology that the drive can meet the shock and vibration specifications given herein while
mounted in such an adapter frame. Adapter frames that are available may not have a mechanical
structure capable of mounting the drive so that it can meet the shock and vibration specifications
listed in this manual.
8.6
Grounding
Signal ground (PCBA) and HDA ground are connected together in the drive and cannot be separated by the
user. The equipment in which the drive is mounted is connected directly to the HDA and PCBA with no electri-
cally isolating shock mounts. If it is desired for the system chassis to not be connected to the HDA/PCBA
ground, the systems integrator or user must provide a nonconductive (electrically isolating) method of mount-
ing the drive in the host equipment.
Increased radiated emissions may result if you do not provide the maximum surface area ground connection
between system ground and drive ground. This is the system designer’s and integrator’s responsibility.
46
Cheetah 15K.4 FC Product Manual, Rev. B
9.0
Interface requirements
This section partially describes the interface requirements as implemented on Cheetah 15K.4 FC drives. Addi-
tional information is provided in the Fibre Channel Interface Manual (part number 77767496).
9.1
FC-AL features
This section lists the Fibre Channel-specific features supported by Cheetah 15K.4 FC drives.
9.1.1
Fibre Channel link service frames
Table 6 lists the link services supported by Cheetah 15K.4 FC drives.
Table 6:
Link services supported
Type of frame
Link service
Basic link service frames
Basic link service reply frames
Abort Sequence (ABTS)
Basic_Accept (BA_ACC)
Basic_Reject (BA_RJT)
Extended link service frames
N_Port Login (PLOGI)
Fabric Login (FLOGI)
Logout (LOGO)
Process Login (PRLI)
Process Logout (PRLO)
Read Link Status (RLS)
Fabric Address Notification (FAN)
Port Discovery (PDISC)
Address Discovery (ADISC)
Third-party Process Logout (TRPLO)
Extended link service reply frames
Fibre Channel Services
Accept (ACC)
Link Service Reject (LS_RJT)
Register FC-4 Types (RFT_ID)
Cheetah 15K.4 FC Product Manual, Rev. B
47
9.1.2
Fibre Channel task management functions
Table 7 lists the Fibre Channel SCSI Fibre Channel Protocol (FC SCSI FCP) task management functions sup-
ported.
Table 7:
Fibre Channel SCSI FCP task management functions
Supported
Task name
Terminate task
Clear ACA
No
Yes
Yes
Yes
Yes
Target reset
Clear task set
Abort task set
9.1.3
Fibre Channel task management responses
Table 8 lists the FC SCSI FCP response codes returned for task management functions supported.
Table 8:
FC SCSI FCP response codes
Function name
Response code
Function complete
Function not supported
Function reject
00
04
05
48
Cheetah 15K.4 FC Product Manual, Rev. B
9.1.4
Fibre Channel port login
Table 9 identifies the required content of the N_Port Login (PLOGI) payload from an initiator.
Table 9:
Bytes
N_Port login (PLOGI) payload
0-15
03
00
00
00
09
09
BB
PN
BB
PN
CF
PN
XX
PN
FS
PN
FS
PN
XX
NN
XX
NN
XX
NN
XX
NN
Common
16-31
32-35
36-47
48-51
52-63
64-67
68-79
80-83
84-95
96-99
100-111
112-115
XX
NN
XX
NN
XX
NN
XX
NN
PN
PN
XX
XX
SO
XX
XX
XX
XX
SO
XX
XX
XX
XX
IC
XX
XX
IC
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
FS
XX
XX
XX
XX
FS
XX
XX
XX
XX
XX
XX
XX
XX
XX
CS
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
Class 1
Class 2
Class 3
Reserved
XX
XX
OS
XX
XX
XX
XX
OS
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
Vendor
Version
X
Indicates a four-bit (hex) field is not checked.
Indicates a single bit is not checked.
x
BB
CF
BB-Credit. This field is not checked. The FC-AL drive uses BB-Credit of zero (0).
Common features. This binary field selects the common features requested by the initiator login.
MSB
Continuously increasing offset
Random relative offset
Valid version level
Must = 1
Not checked. Port Login Accept will return a 0—not supported.
x
N_Port/F_Port
Must = 0, N_Port
Must = 1
Alternate credit model
Other bits reserved
xxx XX
FS
PN
Receive buffer field size. The FS field in the common and Class 3 parameters is checked for the range 128 < FS < 2,112 and a
multiple of four bytes. For multiple frame sequences, all frames but the last frame of the sequence must be this size. Only the
receive buffer field size in the Class 3 parameters is used.
Port name (initiator’s)—saved with the login parameters. If a change of the port name/AL_PA address association is detected
during a Port DISCovery, and implicit logout occurs and the initiator returns a LS_RJT.
NN
SO
Node name. The node name is not checked or saved by the drive.
Service options Class 3 only.
MSB
Class valid
Must = 1
Intermix
x
Stacked connection req.
Sequential delivery
Other bits reserved
xx
x
xxx XX
IC
Initiator control
MSB XID reassign
xx
Proc Assc
Other bits
10 or 11 causes the login to be rejected. Other values are accepted.
XXX
CS
OS
Concurrent sequences
Must be a value greater than 0.
Must be a value greater than 0.
Open sequences per exchange
Cheetah 15K.4 FC Product Manual, Rev. B
49
9.1.5
Fibre Channel port login accept
Table 10 identifies the N_Port Login access payload values.
Table 10:
Bytes
N_Port Login Accept (ACC) payload
0-15
02
00
CC
00
00
UI
00
01
UI
00
F4
UI
09
2P
09
00
00
00
00
88
00
UI
FS
UI
FS
UI
00
20
FF
00
00
00
01
Common
16-31
32-35
36-47
48-51
52-63
64-67
68-79
80-83
84-95
96-99
100-111
112-115
CC
CC
CC
00
00
80
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
FS
00
00
00
00
FS
00
00
00
00
00
00
00
00
00
FF
00
00
00
00
00
00
00
00
00
00
00
00
Class 1
Class 2
Class 3
Reserved
00
00
00
00
00
00
00
01
00
00
00
00
00
00
00
00
00
00
00
00
Vendor -
Version
CC
FS
UI
Bytes (23 and 24) and (31 and 32) are currently factory set to 04 CF respectively (subject to change).
Receive buffer field size. The drive returns and uses the receive buffer size from the N_Port Login Class 3 receive buffer.
Unique identifier. This 24-bit field is uniquely assigned to the drive. This same UI appears in the Port Name and Node Name
fields.
P
Byte port identifier field.
1
2
P_LOGI received on Port A.
P_LOGI received on Port B.
9.1.6
Fibre Channel Process Login
Table 11 lists the process login payload data.
Table 11:
Process Login (PLRI) payload
Bytes
0-15
20
00
10
00
00
00
14
22
08
00
20
00
XX
XX
XX
XX
XX
XX
XX
XX
16-19
XX
Indicates fields that are not used.
50
Cheetah 15K.4 FC Product Manual, Rev. B
9.1.7
Fibre Channel Process Login Accept
Table 12 lists Cheetah 15K.4 FC process login accept payload data.
Table 12:
Process Login Accept (ACC) payload
Bytes
0-15
02
00
10
00
00
00
14
12
08
00
21
00
00
00
00
00
00
00
00
00
16-31
9.1.8
Fibre Channel fabric login
Table 13 lists the fabric login payload from the drive.
Table 13:
Fabric Login (FLOGI) payload
Bytes
0-15
04
00
00
00
00
02
UI
00
F4
UI
09
2P
09
00
00
00
00
08
00
08
40
00
00
00
00
00
00
Common
16-31
32-35
36-47
48-51
52-63
64-67
68-79
80-83
84-95
96-99
100-111
CC CC UI
UI
00
00
08
00
00
UI
00
00
40
00
00
02
00
00
00
00
00
CC
CC UI
00
00
80
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
Class 1
Class 2
Class 3
Reserved
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
Vendor -
Version
112-115 00
CC
UI
Bytes (23 and 24) and (31 and 32) are currently factory set to 04 CF respectively (subject to change).
Unique identifier. This 24-bit field is uniquely assigned to the drive. This same UI appears in the Port Name and Node Name
fields.
P
Port identifier field.
1
2
FLOGI originated on Port A.
FLOGI originated on Port B.
Cheetah 15K.4 FC Product Manual, Rev. B
51
9.1.9
Fibre Channel fabric accept login
Table 14:
Fabric Login Accept (ACC) payload
Bytes
0-15
02
E_
00
00
00
V_
09
09
BB BB CF XX FS FS R_ A_
T0
V_
Common
16-31
32-35
36-47
48-51
52-63
64-67
68-79
80-83
84-95
96-99
100-111
D_ T0
PN PN PN PN PN PN PN PN NN NN NN NN
NN NN NN NN
XX XX XX XX
XX XX XX XX
OS OS XX XX
XX XX XX XX
XX XX XX XX XX XX XX XX XX XX XX XX Class 1
XX XX XX XX XX XX XX XX XX XX XX XX Class 2
SO SO xx
xx
XX XX FS FS XX xx
XX XX Class 3
XX XX XX XX XX XX XX XX XX XX XX XX Reserved
XX XX XX XX XX XX XX XX XX XX XX XX Vendor -
Version
112-115 XX XX XX XX
X
Indicates a four-bit (hex) field is not checked.
x
Indicates a single bit is not checked.
BB
CF
BB-Credit. This field is not checked. The FC-AL drive uses BB-Credit of zero (0).
Common features. This binary field selects the common features requested by the fabric login.
MSB
Continuously increasing offset
Random relative offset
Valid version level
x
x
x
N_Port/F_Port
Must = 1, F_Port
Must = 1
Alternate credit model
Other bits reserved
xxx XX
FS
PN
Receive buffer field size. The FS field in the common and Class 3 parameters is checked for the range 128 < FS < 2,112 and a
multiple of four bytes. The receive buffer field size in the Class 3 parameters is used. The drive uses the lower FS of Fabric
Login Accept or N_Port Login when sending frames to an initiator.
Port Name. The fabric port name is saved with the login parameters. If a change of the port name is detected during a FAN, an
implicit logout occurs and a LS_RJT is returned to the fabric.
NN
SO
Node Name. The drive does not check or save the node name.
Service Options—Class 3 only.
MSB
Class valid
Must = 1
x
Intermix
Stacked connection req.
Sequential delivery
Other bits reserved
xx
Must = 1
xxx XX
52
Cheetah 15K.4 FC Product Manual, Rev. B
9.1.10
Fibre Channel Arbitrated Loop options
Table 15 lists the FC-AL options supported by Cheetah 15K.4 FC drives.
Table 15:
Option
FC-AL options supported
Supported
OPEN Half Duplex
OPEN Full Duplex
Private Loop
Accepted from another device.
Sent to open another device. Accepted from another device.
Yes
Yes
No
Public Loop
Old Port State
Loop Position
Yes
Yes
Loop Position Report
9.2
Dual port support
Cheetah 15K.4 FC drives have two independent FC-AL ports. These ports may be connected on independent
loops or on the same loop. Port A and Port B may be connected in any order or combination.
• If both ports are connected on independent loops and hard addressing is used, the drive interface address is
selected through the interface connector, both ports will seek the same loop address. If no conflict, both
ports will have the same loop address.
• If both ports are connected in the same loop and hard addressing is used, at least one port will attempt tak-
ing a soft address to prevent an address conflict.
Note. When a Cheetah 15K.4 FC drive is connected in loops with previous Seagate FC drive products:
Barracuda 4LP FC (ST32171FC, ST34371FC, and ST34571FC)
Barracuda 9FC (ST19171FC)
Cheetah 4LP FC (ST34501FC)
Cheetah 9FC (ST19101FC)
the connection of Port A and B for these products must follow the requirements in their product manu-
als.
Subject to buffer availability, the Cheetah 15K.4 FC drives support:
• Concurrent port transfers—The drive supports receiving transfers on both ports at the same time when the
ports are on independent loops.
• Full duplex—The drive supports sending FCP_Data, FCP_RSP, FCP_XFR_RDY and ELS transfers while
receiving frames on both ports.
Cheetah 15K.4 FC Product Manual, Rev. B
53
9.3
SCSI commands supported
Table 16 lists the SCSI commands supported by Cheetah 15K.4 FC drives.
Table 16: Supported commands
Command code
Supported [4] Command name
00h
01h
03h
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
N
N
Y
N
Y
Y
Y
Y
Y
Y
Y
Y
Test unit ready
Rezero unit
Request sense
Extended sense
Field pointer bytes
Actual retry count bytes
Format unit [1]
04h
07h
08h
0Ah
0Bh
12h
Reassign blocks
Read
Write
Seek
Inquiry
Vital product data page (00h)
Unit serial number page (80h)
Implemented operating def. page (81h)
Device Identification page (83h)
Firmware numbers page (C0h)
Date code page (C1h)
Jumper settings page (C2h)
Device Behavior page (C3h)
Mode select (same pages as Mode Sense command shown below) [3]
Reserve
15h
16h
3rd party reserved
Extent reservation
17h
18h
1Ah
Release
Copy
Mode sense
Unit attention page (00h)
Error recovery page (01h)
Disconnect/reconnect control (page 02h)
Format page (03h)
Rigid disc drive geometry page (04h)
Verify error recovery page (07h)
Caching parameters page (08h)
54
Cheetah 15K.4 FC Product Manual, Rev. B
Table 16:
Supported commands (continued)
Command code
Supported [4] Command name
Control mode page (0Ah)
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
N
Y
Y
Y
N
Y
Y
Y
Y
N
Y
Y
Y
N
N
N
N
N
N
Y
N
Fibre Channel Interface Control page (19h)
Power control page (1Ah)
Information exceptions control page (1Ch)
Start unit/stop unit
Receive diagnostic results
Supported diagnostics pages
Translate page
1Bh
1Ch
Enclosure services page
Send diagnostics page
Supported diagnostics pages
Translate page
1Dh
25h
28h
Read capacity
Read extended
Disable page out
Force unit access
Relative address
2Ah
Write extended
Disable page out
Force unit access
Relative address
2Bh
2Eh
Seek extended
Write and verify
Disable page out
Byte check
Relative address
2Fh
Verify
Disable page out
Byte check
Relative address
30h
31h
32h
33h
34h
35h
36h
Search data high
Search data equal
Search data low
Set limits
Prefetch
Synchronize cache
Lock-unlock-cache
Cheetah 15K.4 FC Product Manual, Rev. B
55
Table 16:
Supported commands (continued)
Command code
Supported [4] Command name
37h
39h
3Ah
3Bh
Y
N
N
Y
Y
Y
N
Y
N
Y
Y
Y
Y
Y
Y
Y
Y
N
Y
N
N
N
Y
Y
Y
Y
Y
N
Y
Y
Y
N
Y
Y
Y
N
N
Read defect data
Compare
Copy and verify
Write buffer
Write combined header and data mode (0)
Write data mode (2)
Download microcode mode (4)
Download microcode and save modes (5)
Download microcode with offsets mode (6)
Download microcode with offsets and save mode (7)
Firmware download option [2]
Read buffer
3Ch
Read combined header and data mode (0)
Read data mode (2)
Read descriptor mode (3)
Read long
3Eh
3Fh
40h
41h
Write long
Change definition
Write same
PBdata
LBdata
42-4Bh
4Ch
Not used
Log Select
4Dh
Log Sense
Support Log page (00h)
Write Error Counter page (02h)
Read Error Counter page (03h)
Read Reverse Error Counter page (04h)
Verify Error Counter page (05h)
Non-medium Error Counter page (06h)
Temperature page (0Dh)
Application Client page (0Fh)
Self Test Results page (10h)
Cache Statistics Counter page (37h)
Factory Log page (3Eh)
Not used
4E-4Fh
50h
XD write
56
Cheetah 15K.4 FC Product Manual, Rev. B
Table 16:
Supported commands (continued)
Command code
Supported [4] Command name
51h
N
N
N
Y
Y
Y
N
Y
N
Y
N
A
A
N
N
N
N
N
Y
N
N
XP write
52h
XD read
53-54h
55h
Not used
Mode Select (10) [3]
Reserved (10)
3rd party reserve
Extent reservation
Released (10)
Not used
56h
57h
58-59h
5Ah
Mode Sense (10) [3]
Not used
5B-5Dh
5E
Persistent reserve in
Persistent reserve out
Not used
5F
60-7Fh
80h
XD write extended
Rebuild
81h
82h
Regenerate
83-8Fh
A0h
Not used
Report LUNS
Not used
C0-DFh
EO-FFh
Not used
[1] Cheetah 15K.4 FC drives can format to any multiple of four bytes per logical block in the range 512 to 704
bytes.
[2] Warning. Power loss during flash programming can result in firmware corruption. This usually makes the
drive inoperable.
[3] Reference Mode Sense command 1Ah for mode pages supported.
[4] Y = Yes. Command is supported.
N = No. Command is not supported.
A = Support is available on special request.
Cheetah 15K.4 FC Product Manual, Rev. B
57
9.3.1
Inquiry data
Table 17 lists the Inquiry command data that the drive should return to the initiator per the format given in the
Fibre Channel Interface Manual.
Table 17:
Bytes
Cheetah 15K.4 FC inquiry data
Data (hex)
0-15
00
[53
R#
00
00
00
00
00
54
R#
00
00
00
43
03** 12
8B
34
S#
00
00
00
79
53
74
00
36
S#
00
00
00
72
65
73
PP
39
S#
00
00
00
69
61
20
0A
35
S#
00
00
00
67
67
72
53
34
S#
00
00
00
68
61
65
45
46
S#
00
00
00
74
74
73
41
43]1 20
47
41
20
00
00
00
00
63
41
76
54
20
00
00
00
00
29
6C
65
45
20
00
00
00
00
20
6C
64
20
20
00
00
00
00
Vendor ID
Product ID
16-31
32-47
48-63
64-79
80-95
96-111
112-127
128-143
33
R#
00
00
00
6F
31
R#
00
00
00
70
20
68
S#
00
00
00
20
65
65
S#
00
00
00
28
20
72
32* *Copyright
30* 30* 32*
72 69 67
20
20
notice
*
Copyright year (changes with actual year).
**
02 = SCSI-2 implemented with some SCSI-3 features (default).
03 = SCSI-3 implemented.
PP 50 = Inquiry data for an Inquiry command received on Port A.
70 = Inquiry data for an Inquiry command received on Port B.
R# Four ASCII digits representing the last four digits of the product firmware release number.
S# Eight ASCII digits representing the eight digits of the product serial number.
[ ]
Bytes 18 through 26 reflect model of drive. The table above shows the hex values for Model ST3146954FC.
Refer to the values below for the values of bytes 18 through 26 of you particular model:
ST373554FC
ST336854FC
53 54 33 37 33 35 35 34 46 43
53 54 33 33 36 38 35 34 46 43
9.3.2
Mode Sense data
The Mode Sense command provides a way for the drive to report its operating parameters to the initiator. The
drive maintains four sets of mode parameters:
1. Default values
Default values are hard-coded in the drive firmware stored in flash E-PROM (nonvolatile memory) on the
drive’s PCB. These default values can be changed only by downloading a complete set of new firmware
into the flash E-PROM. An initiator can request and receive from the drive a list of default values and use
those in a Mode Select command to set up new current and saved values, where the values are change-
able.
2. Saved values
Saved values are stored on the drive’s media using a Mode Select command. Only parameter values that
are allowed to be changed can be changed by this method. Parameters in the saved values list that are not
changeable by the Mode Select command get their values from default values storage.
When power is applied to the drive, it takes saved values from the media and stores them as current val-
ues in volatile memory. It is not possible to change the current values (or the saved values) with a Mode
Select command before the drive achieves operating speed and is “ready.” An attempt to do so results in a
“Check Condition” status.
On drives requiring unique saved values, the required unique saved values are stored into the saved val-
ues storage location on the media prior to shipping the drive. Some drives may have unique firmware with
unique default values also.
58
Cheetah 15K.4 FC Product Manual, Rev. B
On standard OEM drives, the saved values are taken from the default values list and stored into the saved
values storage location on the media prior to shipping.
3. Current values
Current values are volatile values being used by the drive to control its operation. A Mode Select command
can be used to change the values identified as changeable values. Originally, current values are installed
from saved or default values after a power on reset, hard reset, or Bus Device Reset message.
4. Changeable values
Changeable values form a bit mask, stored in nonvolatile memory, that dictates which of the current values
and saved values can be changed by a Mode Select command. A one (1) indicates the value can be
changed. A zero (0) indicates the value is not changeable. For example, in Table 18, refer to Mode page
81, in the row entitled “CHG.” These are hex numbers representing the changeable values for Mode page
81. Note in columns 5 and 6 (bytes 04 and 05), there is 00h which indicates that in bytes 04 and 05 none of
the bits are changeable. Note also that bytes 06, 07, 09, 10, and 11 are not changeable, because those
fields are all zeros. In byte 02, hex value FF equates to the binary pattern 11111111. If there is a zero in any
bit position in the field, it means that bit is not changeable. Since all of the bits in byte 02 are ones, all of
these bits are changeable.
The changeable values list can only be changed by downloading new firmware into the flash E-PROM.
Note. Because there are often several different versions of drive control firmware in the total population of
drives in the field, the Mode Sense values given in the following tables may not exactly match those
of some drives.
The following tables list the values of the data bytes returned by the drive in response to the Mode Sense com-
mand pages for SCSI implementation (see the Fibre Channel Interface Manual).
Definitions:
SAV = Current saved value.
DEF = Default value. Standard OEM drives are shipped configured this way.
CHG = Changeable bits; indicates if default value is changeable.
Cheetah 15K.4 FC Product Manual, Rev. B
59
Table 18:
Mode Sense data saved, default and changeable values for ST3146954FC drives
MODE SENSE (10 BYTE) HEADER DATA
00 ae 00 10 00 00 00 08 11 17 73 30 00 00 02 00
MODE SENSE PAGES DATA
SAV 81 0a c0 0b ff 00 00 00 05 00 ff ff
DEF 81 0a c0 0b ff 00 00 00 05 00 ff ff
CHG 81 0a ff ff 00 00 00 00 ff 00 ff ff
SAV 82 0e 80 80 00 00 00 00 00 00 05 bc 00 00 00 00
DEF 82 0e 80 80 00 00 00 00 00 00 05 bc 00 00 00 00
CHG 82 0e ff ff 00 00 00 00 00 00 ff ff 00 00 00 00
SAV 83 16 56 20 00 00 00 30 00 00 02 c2 02 00 00 01 00 aa 00 91 40 00 00 00
DEF 83 16 56 20 00 00 00 30 00 00 02 c2 02 00 00 01 00 aa 00 91 40 00 00 00
CHG 83 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
SAV 84 16 00 c6 88 08 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a a7 00 00
DEF 84 16 00 c6 88 08 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a a7 00 00
CHG 84 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
SAV 87 0a 00 0b ff 00 00 00 00 00 ff ff
DEF 87 0a 00 0b ff 00 00 00 00 00 ff ff
CHG 87 0a 0f ff 00 00 00 00 00 00 ff ff
SAV 88 12 14 00 ff ff 00 00 ff ff ff ff 00 20 00 00 00 00 00 00
DEF 88 12 14 00 ff ff 00 00 ff ff ff ff 00 20 00 00 00 00 00 00
CHG 88 12 b5 00 00 00 ff ff ff ff 00 00 a0 ff 00 00 00 00 00 00
SAV 8a 0a 02 00 00 00 00 00 00 00 08 4d
DEF 8a 0a 02 00 00 00 00 00 00 00 08 4d
CHG 8a 0a 03 f1 00 00 00 00 00 00 00 00
SAV 99 06 00 00 00 00 00 00
DEF 99 06 00 00 00 00 00 00
CHG 99 06 00 ff 00 00 00 00
SAV 9a 0a 00 02 00 00 00 05 00 00 00 04
DEF 9a 0a 00 02 00 00 00 05 00 00 00 04
CHG 9a 0a 00 03 ff ff ff ff 00 00 00 00
SAV 9c 0a 10 00 00 00 00 00 00 00 00 01
DEF 9c 0a 10 00 00 00 00 00 00 00 00 01
CHG 9c 0a 9d 0f ff ff ff ff ff ff ff ff
SAV 80 06 00 00 0f 00 00 00
DEF 80 06 00 00 0f 00 00 00
CHG 80 06 b7 40 0f 00 00 00
READ CAPACITY DATA
11 17 73 2f 00 00 02 00
60
Cheetah 15K.4 FC Product Manual, Rev. B
Table 19:
Mode Sense data default and changeable values for ST373554FC drives
MODE SENSE (10 BYTE) HEADER DATA
00 ae 00 10 00 00 00 08 08 8b b9 98 00 00 02 00
MODE SENSE PAGES DATA
SAV 81 0a c0 0b ff 00 00 00 05 00 ff ff
DEF 81 0a c0 0b ff 00 00 00 05 00 ff ff
CHG 81 0a ff ff 00 00 00 00 ff 00 ff ff
SAV 82 0e 80 80 00 00 00 00 00 00 01 3c 00 00 00 00
DEF 82 0e 80 80 00 00 00 00 00 00 01 3c 00 00 00 00
CHG 82 0e ff ff 00 00 00 00 00 00 ff ff 00 00 00 00
SAV 83 16 2b 10 00 00 00 18 00 00 02 c2 02 00 00 01 00 aa 00 91 40 00 00 00
DEF 83 16 2b 10 00 00 00 18 00 00 02 c2 02 00 00 01 00 aa 00 91 40 00 00 00
CHG 83 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
SAV 84 16 00 c6 88 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a a7 00 00
DEF 84 16 00 c6 88 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a a7 00 00
CHG 84 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
SAV 87 0a 00 0b ff 00 00 00 00 00 ff ff
DEF 87 0a 00 0b ff 00 00 00 00 00 ff ff
CHG 87 0a 0f ff 00 00 00 00 00 00 ff ff
SAV 88 12 14 00 ff ff 00 00 ff ff ff ff 00 20 00 00 00 00 00 00
DEF 88 12 14 00 ff ff 00 00 ff ff ff ff 00 20 00 00 00 00 00 00
CHG 88 12 b5 00 00 00 ff ff ff ff 00 00 a0 ff 00 00 00 00 00 00
SAV 8a 0a 02 00 00 00 00 00 00 00 04 7e
DEF 8a 0a 02 00 00 00 00 00 00 00 04 7e
CHG 8a 0a 03 f1 00 00 00 00 00 00 00 00
SAV 99 06 00 00 00 00 00 00
DEF 99 06 00 00 00 00 00 00
CHG 99 06 00 ff 00 00 00 00
SAV 9a 0a 00 02 00 00 00 05 00 00 00 04
DEF 9a 0a 00 02 00 00 00 05 00 00 00 04
CHG 9a 0a 00 03 ff ff ff ff 00 00 00 00
SAV 9c 0a 10 00 00 00 00 00 00 00 00 01
DEF 9c 0a 10 00 00 00 00 00 00 00 00 01
CHG 9c 0a 9d 0f ff ff ff ff ff ff ff ff
SAV 80 06 00 00 0f 00 00 00
DEF 80 06 00 00 0f 00 00 00
CHG 80 06 b7 40 0f 00 00 00
READ CAPACITY DATA
08 8b b9 97 00 00 02 00
Cheetah 15K.4 FC Product Manual, Rev. B
61
Table 20:
Mode Sense data default and changeable values for ST336854FC drives
MODE SENSE (10 BYTE) HEADER DATA
00 ae 00 10 00 00 00 08 04 45 dc cc 00 00 02 00
MODE SENSE PAGES DATA
SAV 81 0a c0 0b ff 00 00 00 05 00 ff ff
DEF 81 0a c0 0b ff 00 00 00 05 00 ff ff
CHG 81 0a ff ff 00 00 00 00 ff 00 ff ff
SAV 82 0e 80 80 00 00 00 00 00 00 01 3c 00 00 00 00
DEF 82 0e 80 80 00 00 00 00 00 00 01 3c 00 00 00 00
CHG 82 0e ff ff 00 00 00 00 00 00 ff ff 00 00 00 00
SAV 83 16 15 88 00 00 00 0c 00 00 02 c2 02 00 00 01 00 f0 00 91 40 00 00 00
DEF 83 16 15 88 00 00 00 0c 00 00 02 c2 02 00 00 01 00 f0 00 91 40 00 00 00
CHG 83 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
SAV 84 16 00 c6 88 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a a7 00 00
DEF 84 16 00 c6 88 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a a7 00 00
CHG 84 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
SAV 87 0a 00 0b ff 00 00 00 00 00 ff ff
DEF 87 0a 00 0b ff 00 00 00 00 00 ff ff
CHG 87 0a 0f ff 00 00 00 00 00 00 ff ff
SAV 88 12 14 00 ff ff 00 00 ff ff ff ff 00 20 00 00 00 00 00 00
DEF 88 12 14 00 ff ff 00 00 ff ff ff ff 00 20 00 00 00 00 00 00
CHG 88 12 b5 00 00 00 ff ff ff ff 00 00 a0 ff 00 00 00 00 00 00
SAV 8a 0a 02 00 00 00 00 00 00 00 02 5b
DEF 8a 0a 02 00 00 00 00 00 00 00 02 5b
CHG 8a 0a 03 f1 00 00 00 00 00 00 00 00
SAV 99 06 00 00 00 00 00 00
DEF 99 06 00 00 00 00 00 00
CHG 99 06 00 ff 00 00 00 00
SAV 9a 0a 00 02 00 00 00 05 00 00 00 04
DEF 9a 0a 00 02 00 00 00 05 00 00 00 04
CHG 9a 0a 00 03 ff ff ff ff 00 00 00 00
SAV 9c 0a 10 00 00 00 00 00 00 00 00 01
DEF 9c 0a 10 00 00 00 00 00 00 00 00 01
CHG 9c 0a 9d 0f ff ff ff ff ff ff ff ff
SAV 80 06 00 00 0f 00 00 00
DEF 80 06 00 00 0f 00 00 00
CHG 80 06 b7 40 0f 00 00 00
READ CAPACITY DATA
04 45 dc cb 00 00 02 00
62
Cheetah 15K.4 FC Product Manual, Rev. B
9.4
Miscellaneous operating features and conditions
Table 21 lists various features and conditions. A “Y” in the support column indicates the feature or condition is
supported. An “N” in the support column indicates the feature or condition is not supported.
Table 21:
Miscellaneous features
Supported
Feature or condition
Y
N
N
N
Y
N
Y
Y
Y
Y
N
Y
FC-AL selective reset (LIP Reset)
Automatic contingent allegiance
Asynchronous event notification
Synchronized (locked) spindle operation
Segmented caching
Zero latency read
Queue tagging (up to 128 queue tags supported)
Deferred error handling
Parameter rounding (controlled by Round bit in Mode Select page 0)
Reporting actual retry count in Extended Sense bytes 15, 16, and 17
Adaptive caching
SMP = 1 in Mode Select command needed to save RPL and rotational offset bytes
Table 22:
Miscellaneous status
Supported
Status
Y
Y
Y
Y
Y
Y
Y
Y
N
N
Good
Check condition
Condition met/good
Busy
Intermediate/good
Intermediate/condition met/good
Reservation conflict
Task set full
ACA active
ACA active, faulted initiator
Cheetah 15K.4 FC Product Manual, Rev. B
63
9.5
FC-AL physical interface
Figure 17 shows the location of the J1 Fibre Channel single connection attachment (FC-SCA) and the J6 con-
nector. Figure 19 provides the dimensions of the FC-SCA connector. Figure 20 provides the dimensions of the
J6 connector.
Details of the physical, electrical, and logical characteristics are provided within this section. The operational
aspects of Seagate’s Fibre Channel drives are provided in the Fibre Channel Interface Manual..
J6
Figure 17.
9.5.1
Physical interface
Physical characteristics
This section defines physical interface connector.
9.5.1.1 Physical description
FIbre Channel drives may be connected in a loop together or with other compatible FC-AL devices. A maxi-
mum of 127 devices may have addresses; however, one of the addresses is reserved for a fabric port switch
device. This means 126 addresses are available for FC-AL devices. More FC-AL compatible devices may
physically reside on the loop, but they will not be functional because they would not be able to obtain valid
addresses.
Port bypass circuits (PBCs) allow devices to be inserted into unpopulated locations or removed from the loop
with loop operation recovery after a brief interruption. These PBCs are located external to the FC-AL device.
Port Bypass
Circuit
From Previous
Drive
To Next
Drive
Port Bypass
Circuit N–1
Port Bypass
Circuit N+1
MUX
Select
Serial
In
Serial
Out
Drive N–1
Drive N+1
Drive N
Figure 18.
Port bypass circuit physical interconnect
64
Cheetah 15K.4 FC Product Manual, Rev. B
9.5.2
Connector requirements
Table 23:
Recommended mating SCA part numbers
Part description
Positions
Part number
787317-1
Features
With polarization
With polarization
With polarization
With polarization
AMP Vertical (SCA sequence)
40
40
40
40
Berg
71781
Methode
Molex
512-220-91-101N
717431040
The FC-AL SCA device connector is illustrated in Figure 19. The J6 connector is illustrated in Figure 20.
1.618 ± .003 in
(41.1 ± 0.08 mm)
Pin 20
Pin 40
Pin 1
0.197 ± .003 in
(5.00 ± .08 mm)
2 places
Pin 21
.64 in
(16.24 mm)
1.28 in
(32.47 mm)
0.394 ± .004 in
(10.0 ± 0.10 mm)
1.618 ± .003 in
(41.10 ± 0.08 mm)
0.226 in
(6.50 mm)
0.039 in
min.
min.
(0.75 mm)
0.264+.007 in
–.010 in
(6.71+0.18 mm)
(–0.25 mm)
1.492 ± .009 in
(37.90 ± 0.24 mm)
0.024 in
(0.60 mm)
min.
Mating end
Housing
0.079 ± .010 in
(2.00 ± .25 mm)
(initial point
of contact)
.05 in
(1.27 mm)
Contact (typ.)
.025 in (0.635 mm)
typ.
0.060 ± .010 in
0.106 ± .010 in
(1.52 ± 0.25 mm)
(2.70 ± 0.25 mm)
0.051 ± .006 in
2 places
(1.30 ± 0.16 mm)
Figure 19.
FC-AL SCA device connector dimensions
.787
(19.99 mm)
.079 (2 mm)
J6
.079
(2 mm)
.708
(17.983 mm)
Figure 20.
J6 connector dimensions
Cheetah 15K.4 FC Product Manual, Rev. B
65
9.5.3
Electrical description
Fibre Channel drives use the FC-SCA connector for:
• DC power
• FC-AL interface
• Drive select (device identification)
• Option selection
• Enclosure Services interface
This 40-pin connector is designed to plug directly into a backpanel. External cables are not required.
9.5.4
This section provides a pin-out of the FC-SCA and a description of the functions provided by the pins.
Table 24: FC-SCA pin descriptions
Pin Signal name
Pin descriptions
Signal type
Pin
21
Signal name
12 Volts charge
Ground
Signal type
1*
2*
3*
4*
5*
6*
7*
8*
9*
-EN bypass port A
Low Voltage TTL output
12 Volts
22
12 Volts
23
Ground
12 Volts
24*
25*
26
+Port A_in
-Port A_in
Ground
FC Diff. input pair
FC Diff. input pair
FC Diff. output pair
FC Diff. output pair
-Parallel ESI
[1]
Ground
Active LED out
Reserved
Open collector out
27*
28*
29
+Port B_in
-Port B_in
Ground
[2]
Start_1
TTL input
[2]
10* Start_2
TTL input
30*
31*
32
+Port A_out
-Port A_out
Ground
11* -EN bypass port B
12* SEL_6
Low Voltage TTL output
TTL input/output
TTL input/output
TTL input
13* SEL_5
33*
34*
35
+Port B_out
-Port B_out
Ground
14* SEL_4
15* SEL_3
TTL input/output
Open collector out
TTL input
16* Fault LED out
17* DEV_CTRL_CODE_2
18* DEV_CTRL_CODE_1
19* 5 Volts
36
SEL_2
TTL input/output
TTL input/output
TTL input/output
TTL input
[2]
[2]
37
SEL_1
TTL input
38
SEL_0
[2
39
DEV_CTRL_CODE_0
5 Volts charge
20* 5 Volts
40
*Short pins in mating backpanel connector.
[1] This pin may be connected to external logic to detect the presence of the drive. The drive connects this
pin to the common ground.
[2] Pins 9, 10, 17, 18, and 39 are option select pins and are tied high by the drive circuitry. The preferred elec-
trical connection at the backplane is either open or grounded (open for the ‘1’ setting, grounded for the ‘0’
setting). Alternatively, these pins may be driven by a 3.3V logic device, pulled up to 3.3V through a pull-up
resistor (recommended size of 10k ohm), or grounded through some other means.
66
Cheetah 15K.4 FC Product Manual, Rev. B
9.5.5
FC-AL transmitters and receivers
A typical FC-AL differential copper transmitter and receiver pair is shown in Figure 21. The receiver is required
to provide the AC coupling to eliminate ground shift noise.
50
.01
TX
Transmitter
TY
RX
Receiver
RY
Differential
Transfer Medium
100
50
.01
Figure 21.
9.5.6
FC-AL transmitters and receivers
Power
Power is supplied through the FC-SCA with support for +5 volts and +12 volts. All of the voltage pins in the
drive connector are the same length.
Four 12 volt pins provide +12 volt power to the drive. The current return for the +12 volt power supply is
through the common ground pins. The supply current and return current must be distributed as evenly as pos-
sible among the pins. The maximum current typically occurs while the drive motor is starting.
Three 5 volt pins provide logic power to the drive. The current return for the +5 volt power supply is through the
common ground pins. Distribute supply and return current as evenly as possible among the voltage and
ground pins.
The mating connector pins use shorter contacts to achieve power surge reductions and to aid in “hot plugging”
the drives. There are longer voltage contacts in the connector to enable the drive filter capacitors to charge.
Current to the drive through the long charge pins is limited by the system in which the drive operates. Three of
the +12 volt pins are shorter to allow capacitive pre-charging through the longer +12 volt charge pin. Two of the
+5 volt pins are shorter to allow capacitive precharging through the longer +5 volt charge pin.
9.5.7
Fault LED Out
The Fault LED Out signal is driven by the drive when:
• the drive detects failure of both ports
• the drive detects an internal failure
• the drive receives the appropriate fault LED command from the host
The Fault LED Out signal is designed to pull down the cathode of an LED. The anode is attached to the proper
+5 volt supply through an appropriate current-limiting resistor. The LED and the current-limiting resistor are
external to the drive.
Cheetah 15K.4 FC Product Manual, Rev. B
67
9.5.8
Active LED Out
The Active LED Out signal is driven by the drive as indicated in Table 25.
Table 25:
Active LED Out conditions
Normal command activity
LED status
Spun down and no activity
Slow blink (20% on and 80% off a 2 sec cycle)
Spun down and activity (command executing)
Spun up and no activity
On
On
Spun up and activity (command executing)
Spinning up or down
Off
Blinks steadily (50% on and 50% off)
Toggles on/off
Format in progress, each cylinder change
The Active LED Out signal is designed to pull down the cathode of an LED. The anode is attached to the
proper +5 volt supply through an appropriate current limiting resistor. The LED and the current limiting resistor
are external to the drive.
9.5.9
Enable port bypass signals
The – Enable Bypass Port A (– EN BYP Port A) and – Enable Bypass Port B (– EN BYP Port B) signals control
the port bypass circuits (PBC) located external to the disc drive. The PBC allows a loop to remain functional in
the event of a drive failure or removal. When these signals are active, low, the PBC bypasses the drive on the
associated port. When an Enable Bypass signal is active, the corresponding Port Bypass LED signal in con-
nector J1 is driven low by the disc drive. A pull down resistor, 1K, located with the PBC should be used to
insure the bypass is enabled if the disc drive is not installed.
The Enable Bypass signal is active under failing conditions within the drive, on detection of the Loop Port
Bypass primitive sequence, or on removal of the drive. In the bypass state the drive continues to receive on the
inbound fibre. Enable Bypass may be deactivated by detection of a Loop Port Enable primitive sequence if the
drive has completed self-test and a hardware failure is not present.
Failure modes detected by the disc drive that will enable bypass include:
• Transmitter/receiver wrap test failure
• Loss of receive clock
• Loss of transmission clock
• Drive interface hardware error
9.5.10
Motor start controls
The drive’s motor is started according to the Start_1 and Start_2 signals described in Table 26. The state of
these signals can be wired into the backplane socket or driven by logic on the backplane.
Table 26:
Motor start control signals
Case
Start_2
Low
Start_1
Low
Motor spin function
1
2
3
Motor spins up at DC power on.
High
Low
Motor spins up only when SCSI Start command is received.
Low
High
Motor spins up after a delay of 12 seconds times the modulo 8 value
of the numeric SEL ID of the drive from DC power on.
4
High
High
The drive will not spin up.
68
Cheetah 15K.4 FC Product Manual, Rev. B
9.5.11
SEL_6 through SEL_0 ID lines
The SEL_6 through SEL_0 ID lines determine drive address, and, optionally, for an Enclosure Services Inter-
face. When the Parallel ESI line is high, the enclosure backpanel must provide address information on the SEL
line. Refer to table 27 for a mapping of SEL to FC-AL physical addresses (AL_PA). You can think of the SEL
lines as the equivalent of a backpanel logic plug. The drives does not provide pull up resistors on these lines.
The backpanel is required to provide high and low inputs to the SEL_ID lines per the specifications in table 29
on page 71.
Note. Table 27 gives AL_PA values for each SEL value. The first entry in the table is SEL_ID 00. The last
entry is SEL_ID 7D. SEL_ID 7E is AL_PA 00 which is not valid for an NL_Port, so is not included in
the table. Also, SEL_ID 7Fh does map to a valid AL_PA; however, this value signals the drive that
physical addresses are not being assigned using the SEL lines and that a “soft” address will be
determined by FC-AL loop initialization.
When the Parallel ESI line is low, the enclosure backpanel logic switches to ESI mode if supported. There are
two modes of ESI, seven bits of enclosure status and a bidirectional mode. ESI support and the mode are
determined by the drive using a discovery process. Refer to the Fibre Channel Interface Manual for a descrip-
tion of ESI operation.
9.5.11.1
Parallel Enclosure Services Interface (ESI)
The parallel ESI line is an output from the drive. This line provides the enclosure with an indication of the
present function of the SEL lines. A high level, the default state, indicates the drive requires address informa-
tion on the SEL lines. A low level indicates the drive is attempting an ESI transfer. The enclosure may not sup-
port ESI on any or all drive locations. It may only support the address function. Support of ESI is discovered by
the drive. Refer to the Fibre Channel Interface Manual for a description of ESI operations.
Cheetah 15K.4 FC Product Manual, Rev. B
69
Table 27:
Arbitrated loop physical address (AL_PA) values
AL_PA
(hex)
SEL ID
(hex)
Setting
(dec)
AL_PA
(hex)
SEL ID
(hex)
Setting
(dec)
AL_PA
(hex)
SEL ID
(hex)
Setting
(dec)
EF
E8
E4
E2
E1
E0
DC
DA
D9
D6
D5
D4
D3
D2
D1
CE
CD
CC
CB
CA
C9
C7
C6
C5
C3
BC
BA
B9
B6
B5
B4
B3
B2
B1
AE
AD
AC
AB
AA
A9
A7
A6
A5
00
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
10
11
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
A3
9F
9E
9D
9B
98
97
90
8F
88
84
82
81
80
7C
7A
79
76
75
74
73
72
71
6E
6D
6C
6B
6A
69
67
66
65
63
5C
5A
59
56
55
54
53
52
51
4E
2B
2C
2D
2E
2F
30
31
32
33
34
35
36
37
38
39
3A
3B
3C
3D
3E
3F
40
41
42
43
44
45
46
47
48
49
4A
4B
4C
4D
4E
4F
50
51
52
53
54
55
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
4D
4C
4B
4A
49
47
46
45
43
3c
3A
39
36
35
34
33
32
31
2E
2D
2C
2B
2A
29
27
26
25
23
1F
1E
1D
1B
18
17
10
0F
08
04
02
01
56
57
58
59
5A
5B
5C
5D
5E
5F
60
61
62
63
64
65
66
67
68
69
6A
6B
6C
6D
6E
6F
70
71
72
73
74
75
76
77
78
79
7A
7B
7C
7D
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
12
13
14
15
16
17
18
19
1A
1B
1C
1D
1E
1F
20
21
22
23
24
25
26
27
28
29
2A
70
Cheetah 15K.4 FC Product Manual, Rev. B
9.5.12
Device control codes
The drive inputs a Device Control Code on the DEV_CTRL_CODE lines at power up to determine the link rate
on the Fibre Channel ports. Both ports run at the same rate. If the backpanel does not connect to these lines,
the drive has 10K ohm pull up resistors that default the device control code to 7 (1.0625 GHz). Table lists the
supported codes.
Table 28:
Device control code values
1 (pin 18) 0 (pin 39)
2 (pin 17)
Definition
0
0
0
0
0
1
1
1
1
0
1
0
1
0
1
0
1
Reserved for power failure warning.
Reserved for auto negotiation of link rate.
Reserved.
0
1
1
0
0
1
1
Reserved.
Reserved.
4.250 GHz operation on both ports.
2.125 GHz operation on both ports.
1.0625 GHz operation on both ports.
9.6
Signal characteristics
This section describes the electrical signal characteristics of the drive’s input and output signals. See Table 24
on page 66 for signal type and signal name information.
9.6.1
TTL input characteristics
Table 29 provides the TTL characteristics.
Table 29:
TTL characteristics
State
Voltage
Current
Input high
Input low
1.9 < VIH < 5.5V
-0.5V < VIL < 0.9V
2.4 < VOH < 5.25V
VOL < 0.5V
IIH = ±500nA max.
IOL = ±500nA max.
IOH < -3mA
Output high (-EN Bypass A, B)
Output low (-EN Bypass A, B)
Output high (-Parallel ESI)
IOL < 3mA
2.4 < VOH < 0.9 VCC
VOH > 0.9VCC
IOH < -2.4mA
IOH < -500µA
Output low (-Parallel ESI)
0 < VOL < .45V
IOL < 2.4mA
Output high (all other outputs)
2.4 < VOH < 0.9 VCC
VOH > 0.9VCC
IOH < -1.6mA
IOH < -500µA
Output low (all other outputs)
0 < VOL < .45V
IOL < 1.6mA
Cheetah 15K.4 FC Product Manual, Rev. B
71
9.6.2
LED driver signals
Fault and Active LED signals are located in the FC-SCA connector (J1) and through the indicator connector
(J6). See Table 30 for the output characteristics of the LED drive signals.
Table 30:
LED drive signal
State
Current drive available
0 < IOH < 100µA
Output voltage
LED off, high
LED on, low
IOL < -30 mA
0 < VOL < 0.8V
9.6.3
FC Differential output
The serial output signal voltage characteristics are provided in Table 31. The outputs are not AC coupled in
order to deliver maximum signal without rise and fall time degradation. You must AC couple the receiver to iso-
late potentially different DC characteristics of the outputs and the receiver.
Table 31:
FC Differential output characteristics
Parameter
Description
Notes
Serial output voltage swing
600 < Vout < 1300 mV
Centered at 1.32V
Bit Time
XMIT Eye
Figure 22.
9.6.4
Transmit eye diagram
FC Differential input
The serial input signal voltage characteristics are provided in Table 32.
Table 32:
FC Differential input characteristics
Description
Parameter
Notes
Serial input voltage swing
200 < Vin < 1.300 mV
AC coupled
72
Cheetah 15K.4 FC Product Manual, Rev. B
Figure 23 provides the data valid eye diagram for typical and minimum requirements to recover data at the
specified interface error rate. The inputs are AC coupled on the drive.
941 ps
659 ps
376 ps
Typical
Minimum
Figure 23.
Table 33:
Receive eye diagram
Eye diagram data values
Link rate
1 GHz
2 GHz
4 GHz
Bit time
941 ps
470 ps
235 ps
1
2
XMIT eye
725 ps min.
315 ps min.
305 ps
158 /113
Typical
659 ps
395 ps
145 ps
113 ps
RCV eye
Minimum
226 ps
1.
2.
Short Ideal load.
End of compliance channel.
Cheetah 15K.4 FC Product Manual, Rev. B
73
74
Cheetah 15K.4 FC Product Manual, Rev. B
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Cheetah 15K.4 FC Product Manual, Rev. B
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Hours of operation are 8:00 A.M. to 8:00 P.M., Monday through Friday, and 9:00 A.M. to 5:00 P.M., Saturday (Eastern time).
76
Cheetah 15K.4 FC Product Manual, Rev. B
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Cheetah 15K.4 FC Product Manual, Rev. B
77
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78
Cheetah 15K.4 FC Product Manual, Rev. B
BGMS 42
buffer
Index
data 8
space 13
Numerics
12 volt
pins 67
A
C
capacity
unformatted 11
acoustics 37
actuator
addresses 64
illustrated 45
altitude 35
ambient 34
ANSI documents
SCSI 5
arbitration 43
auto write and read reallocation
programmable 8
condensation 34
connector
illustrated 65
requirements 65
cooling 45
B
CRC 19
backpanel 66
error 18
CS 49
backplane 68
Cheetah 15K.4 FC Product Manual, Rev. B
79
enable bypass
D
data block size
signal 68
state 19
data heads
read/write 11
environmental
limits 34
requirements 17
error
data rate
internal 11
requirements 25
management 39
rates 17
description 7
DEV_CTRL_CODE 71
devices 43
error correction code
extended link service
frames 47
dimensions 38
Disconnect/reconnect control (page 02h) command
F
fabric 52
FAN 52
FC-AL
Download microcode with offsets and save mode (7)
drive 37
drive capacity
programmable 9
FCP
features 8
interface 47
firmware 8
E
electrical
specifications 25
corruption 57
FLOGI
80
Cheetah 15K.4 FC Product Manual, Rev. B
format 43
function
J
jumpers 43
L
latency
LBdata 56
G
gradient 34
grounding 46
H
HDA 46
heads
humidity 34
disruption 19
initialization 43
loop position
loop position report
I
IC 49
Information exceptions control page (1Ch) command
M
maintenance 17
installation 43
guide 5
interface 43
miscellaneous feature support
description 64
errors 18
illustrated 64
physical 64
requirements 47
interleave 8
Cheetah 15K.4 FC Product Manual, Rev. B
81
miscellaneous status support
OPEN half duplex
orientation 35
OS 49
Busy 63
Good 63
Intermediate/good 63
P
P_LOGI
packaged 36
PBdata 56
PCBA 46
performance characteristics
detailed 11
Mode select
command 54
Mode sense
command 54
motor start
controls 68
option 12
mounting 46
holes 46
orientations 45
general 12
description 64
defined 18
N
payload 49
noise
audible 3
temperature 34
accept 50
power 67
dissipation 31
O
sequencing 27
old port state
OPEN Full Duplex
82
Cheetah 15K.4 FC Product Manual, Rev. B
Pre-Scan 42
private loop
reliability 9
specifications 17
resonance 35
public loop
Rigid disc drive geometry page
command 54
Q
S
safety 3
SCSI interface
Search data
seek error
defined 18
rate 17
seek time
R
receive eye
diagram 73
receivers 67
reference
lines 69
Self-Monitoring Analysis and Reporting Technology
shielding 3
shipping 23
shock 35
documents 5
signal
characteristics 71
Cheetah 15K.4 FC Product Manual, Rev. B
83
Seagate Technology LLC
920 Disc Drive, Scotts Valley, California 95066-4544, USA
Publication Number: 100366896, Rev. B, Printed in USA
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