HP 200 User Manual
HP StorageWorks
XP Disk/Cache P
XP12000/XP10
000 Disk Arrays and SVS 200
artition user guide for
Part number: T1722–96010
Eighth edition: September 2007
Legal and notice information
© Copyright 2005, 2007 Hewlett-Packard Development Company, L.P.
Confidential computer software. Valid license from HP required for possession, use or copying. Consistent with FAR 12.211 and
12.212, Commercial Computer Software, Computer Software Documentation, and Technical Data for Commercial Items are licensed
to the U.S. Government under vendor's standard commercial license.
The information contained herein is subject to change without notice. The only warranties for HP products and services are set forth
in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting
an additional warranty. HP shall not be liable for technical or editorial errors or omissions contained herein.
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Contents
Aboutthisguide .......................... 7
Supported storage platforms and firmware............................ 7
Intendedaudience...................................... 7
Prerequisites ........................................ 7
Relateddocumentation.................................... 7
Documentconventionsandsymbols .............................. 8
HPtechnicalsupport..................................... 8
Subscriptionservice ..................................... 9
HPwebsites......................................... 9
Documentationfeedback ................................... 9
1OverviewofXPDisk/CachePartition................. 11
XPDisk/CachePartitionfeatures................................ 11
Cachelogicalpartitions(CLPRs) .............................. 11
Storagemanagementlogicalpartitions(SLPRs)....................... 13
Partitionadministrationandadministratorrights ........................ 14
2AccessingXPDisk/CachePartition.................. 17
3WorkingwithCLPRs . ...................... 19
CreatingCLPRs ...................................... 21
DeletingCLPRs ...................................... 22
MigratingparitygroupsinCLPRs............................... 23
4WorkingwithSLPRs . ...................... 25
AdministeringSLPRs .................................... 27
CreatingSLPRs ...................................... 28
DeletingSLPRs ...................................... 29
MigratinganSLPR'sresources................................ 30
Displayingerrormessages ................................. 31
5Troubleshooting . ........................ 33
6Notes,restrictions,andrequirements................ 35
CLPRs .......................................... 35
SLPRs .......................................... 35
Index .............................. 37
HP StorageWorks
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Figures
1
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2
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3
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4
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5
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ExampleofaCLPR............................... 12
ExampleofanSLPR .............................. 14
Partition D
Partition Definitionpane(CLPRselected)...................... 19
Partition Definitionpane(SLPRselected)...................... 25
efinitionpane(initialpaneorSubsystemselected) ............. 17
4
Tables
1
2
3
4
5
6
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Documentconventions .............................. 8
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Capacity for data in a hard disk drive associated with a CLPR and standard cache capacity 13
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CommandViewusergrouppermissions...................... 15
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XPRemoteWebConsolemappingtoCommandViewusers ............. 15
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XPRemoteWebConsoleandCommandViewdefaultusers ............. 15
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GeneraltroubleshootingforXPDisk/CachePartition ................ 33
HP StorageWorks
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6
About this guide
This guide provides information about:
• Understanding XP Disk/Cache Partition
• Understanding partition administration and administrator rights
• Accessing XP Disk/Cache Partition
• Working with CLPRs
• Working with SLPRs
• Troubleshooting XP Disk/Cache Partition
Supported st
In this guide
• HP StorageWorks XP12000 Disk Array
• HP StorageWorks XP10000 Disk Array
• HP StorageW
For informa
user guide
orage platforms and firmware
,the term array refers to the following storage platforms:
orks 200 Storage Virtualization System
tion about required firmware versions, see the HP StorageWorks XP Remote Web Console
for XP12000/XP10000/SVS200.
Intended audience
This guide is intended for customers and HP-authorized service providers with knowledge of:
• Disk array hardware and software
• Data processing and RAID storage subsystems and their basic functions
NOTE:
The functions described in this manual may be limited, depending on your assigned level of user access.
Some users will have read-only access while others will have limited or full array access. For additional
information on users and user groups, please see the HP StorageWorks XP Remote Web Console user
guide for XP12000/XP10000/SVS200.
Prerequisites
Prerequisites for using this product include:
• Installing the HP StorageWorks disk array(s)
• Installing the license key for this product
Related documentation
The following documents provide related information:
•
• HP StorageWorks XP Remote Web Console user guide for XP12000/XP10000 Disk Arrays and
SVS 200
• HP StorageWorks XP Cache LUN user guide for XP12000/XP10000 Disk Arrays and SVS 200
HP StorageWorks
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• HP StorageWorks XP External Storage user guide for XP12000/XP10000 Disk Arrays and
SVS 200
• HP StorageWorks XP LUN Configuration and Security Manager user guide for XP12000/XP10000
Disk Arrays and SVS 200
You can find these documents at
h
ttp://www.hp.com/support/rwc/manuals/
Document conventions and symbols
Table 1 Docume
Convention
Blue text: Table 1
Blue, underlined text: http://www.hp.com
Bold text
Italic text Text emphasis
Monospace text
Monospace, italic text
Monospace, bold text
nt conventions
Element
Cross-reference links and e-mail addresses
site addresses
web
• Keys that are pressed
• Text typed into a GUI element, such as a box
• GUI elements that are clicked or selected, such as
menu and list items, buttons, and check boxes
• File and directory names
• System output
• Code
• Commands, their arguments, and argument values
• Code variables
• Command variables
Emphasized monospace text
CAUTION:
Indicates that failure to follow directions could result in damage to equipment or data.
IMPORTANT:
Provides clarifying information or specific instructions.
NOTE:
Provides additional information.
TIP:
Provides helpful hints and shortcuts.
HP technical support
Telephone numbers for worldwide technical support are listed on the HP support website:
ttp://www.hp.com/support/
h
8
About this guide
Collect the following information before calling:
• Technical support registration number (if applicable)
• Product serial numbers
• Product model names and numbers
• Error messages
• Operating system type and revision level
• Detailed, specificquestions
For continuous quality improvement, calls may be recorded or monitored.
Subscription service
HP recommends that you register your product at the Subscriber's Choice for Business website:
ttp://www.hp.com/go/e-updates/
h
After registering, you will receive e-mail notification of product enhancements, new driver versions,
firmware updates, and other product resources.
HP websites
For additional information, see the following HP websites:
• h
ttp://www.hp.com/
• http://www.hp.com/go/storage/
• http://www.hp.com/service_locator/
• http://www.hp.com/support/manuals/
• http://www.hp.com/support/downloads/
• http://www.hp.com/support/rwc/manuals/
Documentation feedback
HP welcomes your feedback.
To make co
storaged
mments and suggestions about product documentation, please send a message to
ocs.feedback@hp.com. All submissions become the property of HP.
HP StorageWorks
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About this guide
1OverviewofXPDisk/Cache Partition
HP StorageWorks XP Disk/Cache Partition enables logical partitioning of the resources in the array. HP
StorageWorks XP Disk/Cache Partition contains the cache logical partition function (CLPR) and the
storage management logical partition function (SLPR).
The cache logical partition function enables you to partition the built-in cache memory in the array
into multiple virtual cache memories. By allocating the partitioned virtual cache to a host, the I/O
performance of other hosts can be protected from decreasing even if one host issues many I/O requests.
The storage management logical partition function enables you to partition an array into multiple virtual
arrays. By having multiple virtual arrays, your data is better protected from risks, such as accidently
destroyed data.
XP Disk/Cache Partition features
XP Disk/Cache Partition has two components:
• Cache logical partitions (CLPRs)
• Storage m
Cache logical partitions (CLPRs)
anagement logical partitions (SLPRs)
If one array is shared with multiple hosts, and one host reads or writes a large amount of data, the
host's read and write data might occupy a large area in the array's cache memory. In this situation,
other hosts slow down the read/write speed because other hosts must wait to write to cache memory.
To prevent this situation, the cache logical partition function in XP Disk/Cache Partition partitions the
array's cache memory. Partitioned cache memories are used as virtual cache memories, and each of
them is allocated to each host. As a result, this prevents the situation where the specified host exclusively
uses most of cache memory.
Figure 1 shows how a corporation's cache memory is partitioned to three virtual cache memories.
Each virtual cache memory is allocated to each host in the three branch offices. Branch A's host is
inputting and outputting a large amount of data to or from the array. However, the read and write data
of Branch A's host does not occupy cache memory because the cache capacity that Branch A's host
canuse is limitedto 40GB. Even if Branch A'shost accessesalargeamountofdata, thehosts of other
branches do not slow down the read/write speed because of the amount of data Branch A is accessing.
The hosts of other branches can always use up to 40 GB of cache area.
IMPORTANT:
Disk/cache partitioning for the SVS200 can be increased up to 8 CLPR and SLPRs with additional
licensing(theSVS200ships with alicense forone SLPR andfourCLPRs).
The virtual cache memory that the cache logical partition function partitions is referred to as the CLPR.
Up to 32 CLPRs including CLPR0 which is provided as a default can be created in one subsystem. For
more information, see Creating CLPRs.
HP StorageWorks
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Figure 1 Example of a CLPR
To create a CLPR, allocate the parity groups to CLPR. For instructions on allocating parity groups, see
Working with CLPRs.
To create and manage a CLPR, you need user authority for the array. For more information about user
authority, see Partition administration and administrator rights and the HP StorageWorks XP Remote Web
Console user guide for XP12000/XP10000/SVS200.
To manage cache memory using the functions in XP Cache LUN or Partial Cache Residence (PCR), you
can set up the cache area for XP Cache LUN and PCR in each CLPR. For more information, see the HP
StorageWorks XP Cache LUN user guide for the XP12000/XP10000/SVS200.
• Capacity criteria when creating a CLPR
If you create a CLPR, use the following formula to calculate the cache capacity allocated to the CLPR.
Cache capacity (GB) = Standard cache capacity (GB) + ↑ ((Cache Residency capacity (MB) +
PCR capacity MB))/2,048) ↑ x2GB
NOTE:
The PCR capacity (MB) described in the formula is the Partial Cache Residence capacity (MB). For
more information about standard cache capacity, see Table 2.
12
Overview of XP Disk/Cache Partition
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