Dell PowerVault MD3600f and
MD3620f Storage Arrays
Deployment Guide
Contents
1
Introduction
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7
System Requirements
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Introduction to Storage Arrays
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Contents
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Silent Installation
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22
22
Enabling Premium Features (Optional)
Upgrading PowerVault MD Storage Software
4
5
Post Installation Tasks
Verifying Storage Array Discovery
Initial Setup Tasks.
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24
Uninstalling MD Storage Software
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27
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Uninstalling MD Storage Software From Linux .
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28
A Appendix—Load Balancing
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Windows Load Balance Policy
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29
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Round Robin With Subset.
Least Queue Depth With Subset .
Changing Load Balance Policies in
Windows Sever 2008 .
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30
B Appendix—Working With SFP
Modules and Fiber Optic Cables
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33
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Guidelines for Using SFP Modules
Installing and Removing SFP Modules
Guidelines for Using Fiber Optic Cables
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35
4
Contents
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Best Practices
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37
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38
Handling Static-Sensitive Components .
Host Cabling for Remote Replication .
Cabling for Performance. .
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Single-Controller and Dual-Controller Topologies .
Labeling Cables .
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Contents
5
6
Contents
1
Introduction
NOTE: Throughout the document, Dell PowerVault MD3600f series storage array
refers to both Dell PowerVault MD3600f and Dell PowerVault MD3620f.
This guide provides information about deploying Dell PowerVault MD3600f
and MD3620f storage arrays. The deployment process includes:
•
•
•
Hardware installation
Modular Disk Storage Manager (MDSM) software installation
Initial system configuration
Other information provided include system requirements, storage array
organization, and utilities.
NOTE: For more information on product documentation, see
support.dell.com/manuals.
MDSM enables an administrator to configure and monitor storage arrays for
optimum usability. The version of MDSM included on the PowerVault MD
series resource media can be used to manage both the PowerVault MD3600f
series and the earlier PowerVault MD series storage arrays. MDSM is
compatible with both Microsoft Windows and Linux operating systems.
System Requirements
Before installing and configuring the PowerVault MD3600f series hardware
and software, ensure that the supported operating system is installed and
minimum system requirements are met. For more information, see the
Support Matrix at support.dell.com/manuals.
Management Station Requirements
A management station uses MDSM to configure and manage storage arrays
across the network. A management station must meet the following
minimum system requirements:
•
Intel Pentium or an equivalent processor (1333 MHz or faster) with 512
MB RAM (1024 MB recommended)
•
1 GB disk space
Introduction
7
•
•
Display resolution of 1024x768 with 16 million colors (1280x1024 32-bit
recommended)
Microsoft Windows, Red Hat Enterprise Linux, or SUSE Linux Enterprise
Server.
NOTE: Operating system installations can be either native or hypervisior
guest configurations.
NOTE: Supported hypervisors include Microsoft Hyper-V, Citrix XenServer,
and VMware. For information about the supported versions, see the Support
Matrix at support.dell.com/manuals.
•
Administrator or equivalent permissions.
Introduction to Storage Arrays
An enclosure containing physical disks accessed through RAID controller
modules is called a storage array. A storage array includes various hardware
components, such as physical disks, RAID controller modules, fans, and
power supplies, gathered into enclosures.
One or more host servers attached to the storage array can access the data on
the storage array. You can also establish multiple physical paths between the
host(s) and the storage array so that loss of any single path (for example,
through failure of a host server port) does not result in loss of access to data
on the storage array.
The storage array is managed by MDSM running on a:
•
Host server—On a host server system, MDSM and the storage array
communicate management requests and event information using
SAS connections.
•
Management station—On a management station, MDSM communicates
with the storage array either through an Ethernet connection to the
storage array management port or through an Ethernet connection to a
host server. The Ethernet connection passes management information
between the management station and the storage array using SAS
connections.
Using MDSM, you can configure the physical disks in the storage array into
logical components called disk groups and then divide the disk groups into
virtual disks. Disk groups are created in the unconfigured capacity of a storage
array. Virtual disks are created in the free capacity of a disk group.
8
Introduction
Unconfigured capacity comprises physical disks not already assigned to a disk
group. When a virtual disk is created using unconfigured capacity, a disk
group is automatically created. If the only virtual disk in a disk group is
deleted, the disk group is also deleted. Free capacity is space in a disk group
that is not assigned to any virtual disk.
Data is written to the physical disks in the storage array using RAID
technology. RAID levels define the way in which data is written to physical
disks. Different RAID levels offer different levels of accessibility, redundancy,
and capacity. You can set a specified RAID level for each disk group and
virtual disk on your storage array.
For more information about using RAID and managing data in your storage
solution, see the Owner’s Manual at support.dell.com/manuals
.
Introduction
9
10
Introduction
2
Hardware Installation
Before using this guide, ensure that you review the instructions in the:
•
Getting Started Guide—The Getting Started Guide that shipped with the
storage array provides information to configure the initial setup of the system.
•
Planning section of the Owner’s Manual—The planning section provides
information about important concepts you should know before setting up
your storage solution. See the Owner’s Manual at
support.dell.com/manuals
.
•
Configuring Fibre Channel With the Dell PowerVault MD3600f Series
Storage Array—This document provides information about configurations,
host bus adapter (HBA) installation, and zoning. See
support.dell.com/manuals
.
Planning the Storage Configuration
Consider the following before installing your storage array:
•
•
•
Evaluate data storage needs and administrative requirements.
Calculate availability requirements.
Decide the frequency and level of backups, such as weekly full backups
with daily partial backups.
•
•
Consider storage array options, such as password protection and e-mail
alert notifications for error conditions.
Design the configuration of virtual disks and disk groups according to a data
organization plan. For example, use one virtual disk for inventory, a second
for financial and tax information, and a third for customer information.
•
Decide whether to allow space for hot spares, which automatically replace
failed physical disks.
Hardware Installation
11
Connecting the Storage Array
The storage array is connected to a host using two hot-swappable RAID
controller modules. The RAID controller modules are identified as RAID
controller module 0 and RAID controller module 1.
Each RAID controller module has four FCIN (host) port connectors that
provide FC connections to the host or node. Each RAID controller module
also contains an Ethernet management port and a SAS Out port connector.
The Ethernet management port allows you to install a dedicated
management station (server or stand-alone system). The SAS Out port allows
you to connect the storage array to optional expansion enclosures for
additional storage capacity.
For more information, see the Getting Started Guide at
support.dell.com/manuals.
NOTE: When you connect a host server to a storage array FCIN port connector,
any Out port connector of the host bus adapter (HBA) of the server can be used.
Cabling the Storage Array
You can cable the storage array to host servers with:
•
Single path data configuration—A single path configuration allows you to
connect a maximum of eight hosts. This is a non-redundant configuration.
•
Dual path data configuration—A dual path configuration allows you to
connect a maximum of four hosts.
You choose the data configuration based on:
•
•
Number of hosts required
Level of data redundancy required
Redundant and Non-Redundant Configurations
Non-redundant configurations are configurations that provide only a single
data path from a host to the storage array. This type of configuration is only
recommended for non-critical data storage. Path failure from a failed or
removed cable, a failed HBA, or a failed or removed RAID controller module
results in loss of host access to storage on the storage array.
12
Hardware Installation
Redundancy is established by installing separate data paths between the host
and the storage array, in which each path is to one of the two RAID controller
modules installed in the storage array. Redundancy protects the host from
losing access to data in the event of path failure, because both RAID
controller modules can access all the disks in the storage array.
NOTE: For detailed information about all cabling configurations including direct
and SAN-attached hosts, cabling for remote replication environments, the use of
zoning, and HBA installation, see Configuring Fibre Channel With the Dell MD3600f
Series Storage Array, at support.dell.com/manuals.
Cabling PowerVault MD1200 Series Expansion
Enclosures
You can expand the capacity of your PowerVault MD3600f series storage array
by adding PowerVault MD1200 series expansion enclosures. You can expand
the physical disk pool to a maximum of 120 (or 192, if enabled using
Premium Feature activation) physical disks using a maximum of seven
expansion enclosures.
Expanding With Previously Configured PowerVault MD1200 Series
Expansion Enclosures
Use this procedure if your expansion enclosure is directly attached to and
configured on a Dell PowerEdge RAID Controller (PERC) H800 adapter.
Data from virtual disks created on a PERC H800 adapter cannot be directly
migrated to a PowerVault MD3600f series storage array or to a PowerVault
MD1200 series expansion enclosure connected to a PowerVault MD3600f
series storage array.
CAUTION: If a PowerVault MD1200 series enclosure that was previously attached
to PERC H800 adapter is used as an expansion enclosure to a PowerVault MD3600f
series storage array, the physical disks of the expansion enclosure are
reinitialized and data is lost. You must backup all data on the expansion enclosure
before attempting the expansion.
To attach previously configured PowerVault MD1200 series expansion
enclosures to the PowerVault MD3200 series storage array:
1
Back up all data on the expansion enclosure(s).
Hardware Installation
13
2
3
Upgrade the expansion enclosure firmware to the latest version available
at support.dell.com while the enclosure is still attached to the PERC H800
controller.
Windows systems users can reference the DUP.exe package and Linux
kernel users can reference the DUP.bin package.
adding the expansion enclosure(s).
For more information, see the Support Matrix at
support.dell.com/manuals
.
a
Install the software and driver package included on the PowerVault
MD series resource media.
For information about installing the software, see "Installing MD
Storage Software" on page 19.
b
c
Update the storage array RAID controller module firmware and
NVSRAM to the latest versions available at support.dell.com, using
PowerVault MDSM
Click Tools Upgrade RAID Controller Module Firmware in the
Enterprise Management Window (EMW).
Stop all I/O and turn off the system and attached units.
.
4
a
Stop all I/O to the array and turn off the host systems attached to the
storage array.
b
c
Turn off the storage array.
Turn off the expansion enclosure(s) in the affected system.
5
6
Cable the expansion enclosure(s) to the storage array.
Turn on attached units:
a
Turn on the expansion enclosure(s). Wait for the enclosure status
LED to turn blue.
b
Turn on the storage array and wait for the status LED to indicate that
the unit is ready:
•
If the status LEDs are solid amber, the storage array is still coming
online.
14
Hardware Installation
•
•
If the status LEDs are blinking amber, there is an error that can be
viewed using the PowerVault MDSM.
If the status LEDs are solid blue, the storage array is ready.
c
When the storage array is online and ready, turn on any attached host
systems.
7
After the PowerVault MD1200 series expansion enclosure is configured as
an expansion enclosure of the storage array, restore the data that was
backed up in step 1.
After the PowerVault MD1200 series expansion enclosures are online, they
can be accessed as a part of the storage array.
Expanding With New PowerVault MD1200 Series Expansion Enclosures
Perform the following steps to attach new PowerVault MD1200 series
expansion enclosures to a PowerVault MD3600f series storage array:
NOTE: Before adding the expansion enclosure(s), ensure that the storage array
software is installed and up to date. For more information, see the Support Matrix at
1
Before adding the expansion enclosure(s), ensure that the storage array
software is installed and is up to date. For more information, see the
Support Matrix at support.dell.com/manuals
.
a
Install the software and driver package included on the PowerVault
MD series resource media.
For information about installing the software, see "Installing MD
Storage Software" on page 19.
b
Set up the PowerVault MD1200 series expansion enclosure(s).
For information about setting up the PowerVault MD1200 series
expansion enclosure(s), see the Owner’s Manual at
support.dell.com/manuals
.
c
d
Using PowerVault MDSM, update the RAID controller module
firmware and NVSRAM to the latest versions available on
support.dell.com
Click Tools Upgrade RAID Controller Module Firmware from the
Enterprise Management Window (EMW).
Stop I/O and turn off all systems:
.
2
Hardware Installation
15
a
Stop all I/O to the storage array and turn off affected host systems
attached to the storage array.
b
c
Turn off the storage array.
Turn off any expansion enclosure(s) in the affected system.
3
4
Cable the expansion enclosure(s) to the storage array.
Turn on attached units:
a
Turn on the expansion enclosure(s). Wait for the enclosure status
LED to turn blue.
b
Turn on the storage array and wait for the status LED to indicate that
the unit is ready:
•
•
•
If the status LEDs are solid amber, the storage array is still coming
online.
If the status LEDs are blinking amber, there is an error that can be
viewed using PowerVault MDSM.
If the status LEDs are solid blue, the storage array is ready.
c
After the storage array is online and ready, turn on any attached host
systems.
5
Using PowerVault MDSM, update all attached expansion enclosure
firmware if it is out of date:
a
From the EMW, select the enclosure that you want to update and
enter the Array Management Window (AMW).
b
c
Click AdvancedMaintanence
DownloadEMM Firmware.
Select Select All to update all the attached expansion enclosures
simultaneously.
16
Hardware Installation
Hardware Installation
17
18
Hardware Installation
3
Installing MD Storage Software
The PowerVault MD series resource media contains software and drivers for
both Linux and Microsoft Windows operating systems.
The root of the media contains a readme.txt file covering changes to the
software, updates, fixes, patches, and other important data applicable to both
Linux and Windows operating systems. The readme.txt file also specifies
requirements for accessing documentation, information regarding versions of
the software on the media, and system requirements for running the software.
For more information on supported hardware and software for Dell PowerVault
systems, see the Support Matrix located at support.dell.com/manuals.
NOTE: It is recommended that you install all the latest updates available at
support.dell.com.
The PowerVault MD3600f series storage software installer provides features that
include the core software and providers. The core software feature includes the
host-based storage agent, multipath driver, and MD Storage Manager
application used to configure, manage and monitor the storage array solution.
The providers feature include providers for the Microsoft Virtual Disk Service
(VDS) and Microsoft Volume Shadow-Copy Service (VSS) framework.
NOTE: For more information about the Microsoft VDS and Microsoft VSS providers,
see the Owner's Manual at support.dell.com/manuals.
NOTE: To install the software on a Windows or Linux system, you must have
administrative or root privileges.
The PowerVault MD series resource media offers the following installation
methods:
•
Graphical Installation (Recommended)—This is the recommended
installation procedure for most users. The installer presents a graphical
wizard-driven interface that allows customization of which components
are installed.
•
Console Installation—This installation procedure is useful for Linux users
that do not desire to install an X-Window environment on their supported
Linux platform.
Installing MD Storage Software
19
•
Silent Installation—This installation procedure is useful for users that
prefer to create scripted installations.
Installing Host Bus Adapters and Drivers
NOTE: Ensure that you read the Configuring Fibre Channel With the Dell MD3600f
Series Storage Array document before continuing with this procedure.
1
2
3
4
Install the host bus adapters (HBAs).
Connect the cables.
Install the HBA drivers and the operating system HBA patches/hotfixes.
Ensure that the recommended HBA settings are applied.
Graphical Installation (Recommended)
The MD Storage Manager application configures, manages, and monitors the
storage array. To install the MD storage software:
1
Insert the PowerVault MD series resource media.
Depending on your operating system, the installer may launch
automatically. If the installer does not launch automatically, navigate to
the root directory of the installation media (or downloaded installer
image) and run the md_launcher.exe file. For Linux-based systems,
navigate to the root of the resource media and run the autorun file.
NOTE: By default, Red Hat Enterprise Linux mounts the resource media with the
–noexec mount option which does not allow you to run executable files. To change
this setting, see the Readme file in the root directory of the installation media.
2
3
4
Select Install MD Storage Software.
Read and accept the license agreement.
Select one of the following installation options from the Install Set
dropdown menu:
•
Full (recommended)—Installs the MD Storage Manager (client)
software, host-based storage agent, multipath driver, and hardware
providers.
•
Host Only—Installs the host-based storage agent and multipath
drivers.
20
Installing MD Storage Software
•
•
Management—Installs the management software and hardware
providers.
Custom—Allows you to select specific components.
5
6
Select the PowerVault MD storage array model(s) you are setting up to
serve as data storage for this host server.
Choose whether to start the event monitor service automatically when the
host server reboots or manually.
NOTE: This option is applicable only to Windows client software installation.
7
8
9
Confirm the installation location and choose Install.
If prompted, reboot the host server once the installation completes.
Start MD Storage Manager and discover the array(s).
NOTE: If Dynamic Host Configuration Protocol (DHCP) is not used on the
network where the PowerVault MD storage array’s management ports are
connected, it is recommended that you enable IPv6 on the management
station to discover the storage array(s).
10 Configure single initiator and multiple target zoning on your Fibre
Channel switches.
11 If applicable, activate any premium features purchased with your storage
array. If you purchased premium features, see the printed activation card
shipped with your storage array.
NOTE: The MD Storage Manager installer automatically installs the required
drivers, firmware, and operating system patches/hotfixes to operate your storage
array. These drivers and firmware are also available at support.dell.com. In
addition, see the Support Matrix at support.dell.com/manuals for any additional
settings and/or software required for your specific storage array.
Console Installation
NOTE: Console installation only applies to Linux systems that are not running a
graphical environment.
The autorun script in the root of the resource media detects when there is no
graphical environment running and automatically starts the installer in a
text-based mode. This mode provides the same options as graphical installation.
Installing MD Storage Software
21
Silent Installation
To run silent installation on a Windows system:
1
2
3
Copy the custom_silent.properties file in the /windows folder of the
installation media or image to a writable location on the host server.
Modify the custom_silent.properties file to reflect the features, models
and installation options to be used. Then, save the file.
Once the custom_silent.properties file is revised to reflect your specific
installation, run the following command to begin the silent installation:
mdss_install.exe –f <host_server_path>\
custom_silent.properties
To run silent installation on a Linux system:
NOTE: On Red Hat Enterprise Linux 6 operating systems, run the following
script from the root directory to install prerequisite packages:
# md_prereq_install.sh
1
2
3
Copy the custom_silent.properties file in the /windows folder of the
installation media or image to a writable location on the host server.
Modify the custom_silent.properties file to reflect the features, models
and installation options to be used. Then, save the file.
Once the custom_silent.properties file is revised, run the following
command to begin the installation:
./mdss_install.bin –f
<host_server_path>/custom_silent.properties
Features Card to install the additional features.
Upgrading PowerVault MD Storage Software
To upgrade from a previous version of the PowerVault MD Storage Manager
application, uninstall the previous version (see "Uninstalling MD Storage
Software" on page 27), and then follow the instructions in "Installing MD
Storage Software" on page 19 to install the new version.
22
Installing MD Storage Software
4
Post Installation Tasks
Before using the Dell PowerVault storage array for the first time, complete
these initial configuration tasks in the order shown. These tasks are
performed using the MD Storage Manager (MDSM) software.
1
For out-of-band management, you must set the network configuration for
each RAID controller module, including its Internet Protocol (IP) address,
subnetwork mask (subnet mask), and gateway.
NOTE: You can set the network configuration using a DHCP server.
2
Start MDSM.
•
Click StartProgramsDellMD Storage ManagerModular
Disk Storage Manager Client on Microsoft Windows operating
systems.
•
•
Click the PowerVault MD Storage Manager desktop icon on Linux
operating systems.
You can also launch PowerVault MD Storage Manager in Linux by
running the following commands at the command prompt:
cd /opt/dell/mdstoragesoftware/mdstoragemanager
/client./SMclient
3
Go to Setup
Add Storage Array and start the automatic discovery of
systems in the Enterprise Management Window (EMW).
NOTE: Only storage arrays configured with IP address on the same subnet as
the management stations will be detected.
NOTE: It may take several minutes for the discovery process to complete.
Closing the Automatic Discovery Status window before this stops the
discovery process.
After discovery is complete, a confirmation screen is displayed.
4
Click Close to close the screen.
Post Installation Tasks
23
Verifying Storage Array Discovery
The Automatic Discovery option automatically discovers both in-band and
out-of-band arrays and adds the storage arrays to the management domain. If the
out-of-band or in-band connections shown on the summary page are not
accurate, complete the following steps. For more information, see the Online
Help.
1
Check the hardware and connections for possible problems. For specific
procedures on troubleshooting interface problems, see the Owner's Manual
at support.dell.com/manuals
.
2
3
Verify that the array is on the local subnetwork. If it is not, click the new
link to manually add it.
Verify that the status of each storage array is Optimal. If any array shows
an Unresponsive status, complete one of the following steps:
a
b
To remove the array from the management domain, highlight the
array and then click Remove link
To add an array, click New link
In Linux, click the Manual button and click OK
.
.
.
4
If the array still shows an Unresponsive status, contact Dell.
Initial Setup Tasks
1
The name of the first storage array found is displayed in the Devices tab of
the EMW. To see a list of all storage arrays found on the local network,
expand the discovered storage arrays tab in the device pane of the EMW.
2
The default name for a newly installed MD3600f series storage array is
next to the name and click Unnamed in the drop-down list.
3
4
Double-click on the discovered array to launch the array management
window and make changes to the configuration of the array.
Click Perform Initial Setup Tasks to see an outline and links to the
remaining post-installation tasks. The array is now ready to be configured.
See the Owner’s Manual for information about each task and to perform
the necessary configuration steps. Table 4-1 lists the recommended
configuration steps that can be accomplished using the Owner’s Manual
.
24
Post Installation Tasks
NOTE: Before configuring the storage array, check the status icons on the Device pane
to ensure that the enclosures in the storage array are in an Optimal status. For more
information on the status icons, see the Owner’s Manual at support.dell.com/manuals.
Table 4-1. Initial Setup Tasks Dialog Box
Task
Purpose
Rename the storage array
To provide a more meaningful name than the
software-assigned label, Unnamed.
Set a storage array password
To restrict unauthorized access. MDSM may
ask for a password before changing the
configuration or performing a destructive
operation.
Set up alert notifications
Set up e-mail alerts
To notify individuals (by e-mail) and/or
storage enterprise management consoles, such
as Dell Management Console, (by SNMP)
when a storage array component degrades or
fails, or an adverse environmental condition
occurs.
Set up SNMP alerts
Configure a storage array
To create virtual disks and map them to hosts.
Post Installation Tasks
25
26
Post Installation Tasks
5
Uninstalling MD Storage Software
Uninstalling MD Storage Software From
Windows
Use the Change/Remove Program feature to uninstall the Modular Disk
Storage Software (MDSM) from Microsoft Windows operating systems other
than Microsoft Windows Server 2008:
1
2
3
Double-click Add or Remove Programs from the Control Panel
Select Dell MD32xx storage software from the list of programs.
Click Change/Remove
.
i
.
The Uninstall Complete window is displayed.
4
5
Follow the instructions on screen.
Select Yes to restart the system, and then click Done
.
Use the following procedure to uninstall Modular Disk Storage software from
Windows Server 2008 GUI versions:
1
2
3
Double-click Programs and Features from the Control Panel
Select MD Storage Software from the list of programs.
Click Uninstall/Change.
.
The Uninstall Complete window is displayed.
4
5
Follow the instructions on screen.
Select Yes to restart the system, then click Done
.
Use the following procedure to uninstall PowerVault Modular Disk Storage
Software on Windows Server 2008 Core versions:
1
Navigate to the Dell\MD Storage Software\Uninstall Dell Modular Disk
32xxi Storage Software directory.
Uninstalling MD Storage Software
27
NOTE: By default, MD Storage Manager is installed in the \Program
Files\Dell\MD Storage Software directory. If another directory was used
during installation, navigate to that directory before beginning the
uninstallation procedure.
2
From the installation directory, type the following command and press
<Enter>:
Uninstall Modular Disk Storage
3
4
From the Uninstall window, click Next and follow the instructions on the
screen.
Select Yes to restart the system, then click Done
.
Uninstalling MD Storage Software From Linux
1
By default, PowerVault MD Storage Manager is installed in the
/opt/dell/mdstoragemanager directory. If another directory was used
during installation, navigate to that directory before beginning the
uninstallation procedure.
2
From the installation directory, open the Uninstall Dell MD Storage
Software directory.
3
4
Run the file Uninstall Dell MD Storage Software.exe.
From the Uninstall window, click Next, and follow the instructions on the
screen.
While the software is uninstalling, the Uninstall window is displayed.
When the uninstall procedure is complete, the Uninstall Complete
window is displayed.
5
Click Done.
28
Uninstalling MD Storage Software
A
Appendix—Load Balancing
Windows Load Balance Policy
Multi-path drivers select the I/O path to a virtual disk through a specific
RAID controller module. When the multi-path driver receives a new I/O, the
driver tries to find a path to the current RAID controller module that owns
the virtual disk. If that path cannot be found, the multi-path driver migrates
the virtual disk ownership to the secondary RAID controller module. When
multiple paths to the RAID controller module that owns the virtual disk exist,
you can choose a load balance policy to determine which path is used to
process I/O. Multiple options for setting the load balance policies let you
optimize I/O performance when mixed host interfaces are configured.
You can choose one of the following load balance policies to optimize
I/O performance:
•
•
Round robin with subset
Least queue depth with subset
Round Robin With Subset
The round-robin with subset I/O load balance policy routes I/O requests, in
rotation, to each available data path to the RAID controller module that
owns the virtual disks. This policy treats all paths to the RAID controller
module that owns the virtual disk equally for I/O activity. Paths to the
secondary RAID controller module are ignored until ownership changes.
The basic assumption for the round-robin policy is that the data paths are
equal. With mixed host support, the data paths might have different
bandwidths or different data transfer speeds.
Appendix—Load Balancing
29
Least Queue Depth With Subset
The least queue depth with subset policy is also known as the least I/Os, or
least requests, policy. This policy routes the next I/O request to a data path
that has the least outstanding I/O requests queued. For this policy, an I/O
request is simply a command in the queue. The type of command or the
number of blocks that are associated with the command are not considered.
The least queue depth with subset policy treats large block requests and small
block requests equally. The data path selected is in the path group of the
RAID controller module that owns the virtual disk.
Changing Load Balance Policies in Windows Sever 2008
Load balancing with the PowerVault MD3600 series is only available for
Windows Server 2008 or later versions of the operating system. You can
change the load balance policies from the default round robin with subset by
using one of the following:
•
•
Device Manager options
Disk Management options
Changing the Load Balance Policy Using Windows Server 2008 Device
Manager Options
1
From the host desktop, right-click My Computer and select Manage to
open the Computer Management window.
2
3
Click Device Manager to show the list of devices attached to the host.
Right-click the multi-path disk device for which you want to set load
balance policies, then select Properties
.
4
From the MPIO tab, select the load balance policy you want to set for this
disk device.
30
Appendix—Load Balancing
Changing the Load Balance Policy Using the Windows Server 2008 Disk
Management Options
1
2
3
4
From the host desktop, right-click My Computer and select Manage to
open the Computer Management window.
Click Disk Management to show the list of virtual disks attached to
the host.
policy, then click Properties
.
From the MPIO tab, select the load balance policy that you want to set for
this virtual disk.
Setting Load Balance Policies in Linux
Linux only supports round robin based load balancing. For more information,
see "Round Robin With Subset" on page 29.
Appendix—Load Balancing
31
32
Appendix—Load Balancing
B
Appendix—Working With SFP
Modules and Fiber Optic Cables
Each storage controller can have up to four FC host ports. A
small-form-factor pluggable (SFP) module is used to connect a host port to a
host or switch. The SFP module is inserted into the port, and then a fiber
optic cable is inserted into the SFP module. The other end of the fiber optic
cable is connected to an optical interface connector either in a FC HBA on a
host or a switch. SFP modules are laser products.
WARNING: Data processing environments can contain equipment transmitting
on system links with laser modules that operate at greater than Class 1 power
levels. Never look into the end of an optical fiber cable or open receptacle.
Guidelines for Using SFP Modules
The storage array requires SFP modules. SFP modules convert electrical
signals to optical signals that are required for FC transmission to and from
RAID controller modules. After installing the SFP modules, fiber optic cables
are used to connect the storage array to other FC devices. Before installing
SFP modules and fiber optic cables, read the following information:
•
Use only Dell supported SFPs with the Dell PowerVault MD3600f series
storage arrays. Other generic SFPs are not supported and may not work
with the storage arrays.
•
•
The SFP module housing has an integral guide key that is designed to
prevent you from inserting the SFP module incorrectly.
Use minimal pressure when inserting an SFP module into a FC port.
Forcing the SFP module into a port may damage the SFP module or
the port.
•
You can install or remove the SFP module while the port is powered on.
Appendix—Working With SFP Modules and Fiber Optic Cables
33
•
•
You must install the SFP module into a port before you connect the fiber
optic cable.
You must remove the fiber optic cable from the SFP module before you
remove the SFP module from the port.
CAUTION: When handling static-sensitive devices, take precautions to avoid
damaging the product from static electricity.
Installing and Removing SFP Modules
To install SFP modules:
1
2
3
Remove the SFP module from the static protective package.
Remove the protective cap from the SFP module and SFP port.
NOTE: Store the protective caps for future use.
4
5
Insert the SFP module into the host port until it clicks into place.
Connect an FC cable. See "Installing and Removing Fibre Channel
Cables" on page 36.
Figure B-1. Installing and Removing an SFP Module
1
2
1
SFP transceiver
2
Fiber optic cable
34
Appendix—Working With SFP Modules and Fiber Optic Cables
To remove SFP modules:
1
Remove the FC cable from the SFP module. See "Installing and Removing
Fibre Channel Cables" on page 36.
NOTE: To avoid damaging the cable or the SFP module, disconnect the FC
cable before removing the SFP module.
2
3
Unlock the SFP module latch. For SFP modules that contain wire tabs,
unlock the SFP module latch by pulling the wire latch outward 90°.
With the SFP module latch in the unlocked position, remove the SFP
module. For SFP modules that contain wire tabs, grasp the wire latch and
pull the SFP module out of the port.
4
5
Replace the protective cap on the SFP module and the host port.
Place the SFP module into a static-protective package.
Guidelines for Using Fiber Optic Cables
•
Do not route the cable along a folding cable management arm.
•
For devices on slide rails, leave enough slack in the cables so they do not
bend to a diameter of less than 76 mm (3"), or a radius less than 38 mm
(1.5"), when extended or become pinched when retracted.
•
Route the cable away from places where it can be damaged by other
devices in the rack cabinet.
•
•
Do not use plastic cable ties in place of the provided cable straps.
Do not over-tighten the cable straps or bend the cables to a diameter of
less than 76 mm (3") or a radius less than 38 mm (1.5").
•
Do not place excess weight on the cable at the connection point. Ensure
that the cable is well supported.
Appendix—Working With SFP Modules and Fiber Optic Cables
35
Installing and Removing Fibre Channel Cables
WARNING: Data processing environments can contain equipment transmitting
on system links with laser modules that operate at greater than Class 1 power
levels. Never look into the end of an optical fiber cable or open receptacle.
Before installing an FC cable, see "Guidelines for Using Fiber Optic Cables"
on page 35.
To install an FC cable:
1
2
3
If applicable, remove the protective cap from the SFP module and store
the protective cap for future use.
Remove the two protective caps from one end of the cable and store them
for future use.
Insert the cable into an SFP module that is installed in the storage array.
The cable connector is keyed for correct installation. Holding the
connector, push in the cable until it clicks into place.
4
5
Remove the two protective caps from the other end of the cable and store
them future use.
Connect this end of the cable to one of the following devices:
•
•
An SFP module that is installed in an FC switch port
An FC HBA port
To remove an FC cable:
1
Press and hold the lever to release the latches before removing the cable
from the SFP module. Ensure that the levers are in the released position
when removing the cable. Do not grasp the SFP module plastic tab when
removing the cable.
2
3
On the end of the cable that connects into the SFP module or HBA, press
down and hold the lever to release the latches.
While pressing down the cable lever, pull the connector to remove the
cable from the SFP module.
4
5
Replace the protective caps on the cable ends.
Replace the protective cap on the SFP module.
36
Appendix—Working With SFP Modules and Fiber Optic Cables
C
Appendix—Hardware Cabling Best
Practices
Handling Static-Sensitive Components
Static electricity can damage memory modules, system boards, and other
static-sensitive components. To prevent damaging the system, follow
these precautions:
•
•
Move and store all components in the static-protective packaging.
Place components on a grounded surface before removing them from their
static-protective packaging.
•
•
Grounded surfaces include static-dissipating mats or grounded workstations.
Always be properly grounded when touching a static-sensitive component.
To properly ground yourself, wear a wrist strap or boot strap made for this
purpose.
•
•
Handle the component by its edges. Do not touch solder joints, pins, or
printed circuitry.
Use conductive field service tools.
Host Cabling for Remote Replication
The Remote Replication premium feature provides online, real-time
replication of data between storage arrays over a remote distance. In the event
of a disaster or a catastrophic failure at one storage array, a second storage
array can be promoted to take over responsibility for computing services. The
Remote Replication premium feature requires a dedicated host port for
replicating data between storage arrays. After the Remote Replication
premium feature has been activated, one host I/O port on each RAID
controller module is solely dedicated to replicating operations.
Appendix—Hardware Cabling Best Practices
37
NOTE: If Remote Replication is activated, host port 3 on each RAID controller
module is dedicated for the communication that occurs between the two
storage arrays (primary and secondary virtual disks). If the Remote Replication
premium feature is not being used, these host ports are available for ordinary
host connections.
Cabling for Performance
Data transfer performance is enhanced by maximizing bandwidth, which is
the ability to process more I/O across more channels. Therefore, a
configuration that maximizes the number of host channels and the number
of drive channels available to process I/O maximizes performance. Faster
processing speeds also maximize performance.
In addition to planning a topology that provides maximum performance,
choose a RAID level that suits the planned applications.
Single-Controller and Dual-Controller Topologies
While creating a topology for a RAID enclosure that contains only one RAID
controller module, attach expansion enclosures that contain only one single
environmental services monitor (ESM). Do not attach an expansion
enclosure that contains two ESMs to a single-controller RAID enclosure.
Labeling Cables
Cabling is an important part of creating a robust storage array. Labeling the
cables identifies system components and drive channels. System
maintenance is easier when the cables are correctly identified. Label both
ends of each cable. You can use adhesive office labels that are folded in half
over the ends of each cable. Mark the labels with the port identifiers to which
the cable is connected. Additional information can be provided by using
color-coded cable straps (or ties) to group all cables associated with one
component or drive channel.
If a component fails, the cables must be disconnected, the failed component
replaced, and the cables reattached. Detailed labeling of the cables simplifies
the component replacement process.
If you are adding a new expansion enclosure to an existing configuration,
correctly labeled cables helps identify where to connect the new enclosure.
38
Appendix—Hardware Cabling Best Practices
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