HP P9000 User manual

HP StorageWorks
P9000 Cache Partition User Guide
Abstract
This guide describes how to use the HP StorageWorks P9000 Cache Partition Software on HP StorageWorks P9000 disk
arrays. The intended audience is a storage administrator or authorized service provider with independent knowledge of HP
StorageWorks P9000 disk arrays and P9000 software.
HP Part Number: AV400-96360
Published: May 2011
Edition: Fourth

© Copyright 2010, 2011 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.
Acknowledgements
Microsoft®, Windows®, Windows® XP, and Windows NT® are U.S. registered trademarks of Microsoft Corporation.
Export Requirements
You may not export or re-export this document or any copy or adaptation in violation of export laws or regulations.
Without limiting the foregoing, this document may not be exported, re-exported, transferred or downloaded to or within (or to a national resident
of) countries under U.S. economic embargo, including Cuba, Iran, North Korea, Sudan, and Syria. This list is subject to change.
This document may not be exported, re-exported, transferred, or downloaded to persons or entities listed on the U.S. Department of Commerce
Denied Persons List, Entity List of proliferation concern or on any U.S. Treasury Department Designated Nationals exclusion list, or to parties directly
or indirectly involved in the development or production of nuclear, chemical, biological weapons, or in missile technology programs as specified
in the U.S. Export Administration Regulations (15 CFR 744).
Revision History
DescriptionDateEdition
Applies to microcode version 70-01-01-00/00 or later.October 2010First
Applies to microcode version 70-01-24-00/00 or later.November 2010Second
Applies to microcode version 70-01-62-00/00 or later.January 2011Third
Applies to microcode version 70-02-01-00/00 or later.May 2011Fourth

Contents
1 Creating virtual cache partitions...................................................................4
Resources that can be executed for each function..........................................................................4
About virtual cache partitions.....................................................................................................4
Cache capacity for a CLPR....................................................................................................5
Cache partitioning rules and guidelines.......................................................................................6
Partitioning cache.....................................................................................................................7
Cache partition work flows....................................................................................................7
Creating a CLPR..................................................................................................................7
Migrating resources to and from a CLPR..................................................................................8
Deleting a CLPR ..................................................................................................................9
2 Troubleshooting........................................................................................10
Troubleshooting Cache Partition................................................................................................10
3 Support and other resources......................................................................11
Contacting HP........................................................................................................................11
Subscription service............................................................................................................11
Documentation feedback....................................................................................................11
Related information.................................................................................................................11
HP websites......................................................................................................................11
Conventions for storage capacity values....................................................................................12
Typographic conventions.........................................................................................................12
A Cache Partition GUI reference....................................................................14
Partition Definition tab (Subsystem selected)................................................................................14
Partition Definition tab, Cache Logical Partition window (CLPR selected).........................................15
Partition Definition tab, Cache Logical Partition window (each CLPR’s information)...........................15
Select CU dialog box..............................................................................................................17
Glossary....................................................................................................19
Index.........................................................................................................20
Contents 3

1 Creating virtual cache partitions
Unless otherwise specified, the term P9000 in this guide refers to the following disk array:
•P9500 Disk Array
The GUI illustrations in this guide were created using a Windows computer with the Internet Explorer
browser. Actual windows may differ depending on the operating system and browser used. GUI
contents also vary with licensed program products, storage system models, and firmware versions.
This chapter provides detailed instructions for dividing storage system cache memory into virtual
cache logical partitions (CLPRs) using Cache Partition software.
Resources that can be executed for each function
Remote Web Console secondary window shows all of the resources in the storage system. However,
the functions described in this manual are only available to the resources assigned to a user account
that logs in to the Remote Web Console. Verify the resource group ID in the Report Display dialog
boxes, and then execute the operations for the resources assigned to the user account. When you
use the functions, the resources for each operation must satisfy specific conditions.
For details on user accounts, see the HP StorageWorks P9000 Remote Web Console User Guide.
For details on the conditions of the resources, see the HP StorageWorks P9000 Provisioning for
Open Systems User Guide or the HP StorageWorks P9000 Provisioning for Mainframe Systems
User Guide.
About virtual cache partitions
If one storage system is shared with multiple hosts, one host reading or writing a large amount of
data can require enough of the storage system’s cache memory to affect other users. The Cache
Partition function allows improved I/O performance by dividing storage system cache memory
into multiple virtual cache memories (cache logical partitions or CLPRs).
Partitioning cache matches data to appropriate storage resources based on availability,
performance, capacity, and cost. It improves flexibility by allowing dynamic changes to cache
partitions while in use.
Partitioning cache dedicates cache resources for exclusive use by specific applications to maintain
priority and quality of service for business-critical applications. Storage administrators can secure
and/or restrict access to storage resources to ensure confidentiality for specific applications. By
dedicating resources to each partition as needed, a high quality of service can be maintained for
all users.
The following illustrates the use of cache memory within a corporation. In this example, cache
memory is partitioned into three segments of 40 GB, each of which is allocated to a branch office.
The host of branch A has a heavy I/O load. Because the cache memory is partitioned, that heavy
I/O load does not impact the cache memory for the other two branches.
4 Creating virtual cache partitions

Cache capacity for a CLPR
A CLPR is a pool of the cache and parity groups in the storage system. Partitioning cache into one
or more CLPRs allows storage administrators to dedicate individual CLPRs to a different host,
preventing I/O contention for cache memory.
Before partitioning cache memory into CLPRs, calculate how much cache capacity will be needed
on your storage system, and then install any needed additional cache memory. It will be difficult
to add more cache memory after partitioning cache into CLPRs.
To determine whether you need additional cache capacity, see the following table and formulas.
The recommended cache capacity for an internal volume is determined by the storage capacity
assigned to the cache logical partition.
Table 1 CLPR data capacity and recommended cache capacity
Recommended cache capacityCLPR data capacity
4 GB or moreLess than 720 GB
8 GB or more720 GB or more
12 GB or more2,900 GB or more
16 GB or more8,650 GB or more
20 GB or more14,400 GB or more
24 GB or more20,160 GB or more
28 GB or more128,000 GB or more
32 GB or more146,000 GB or more
40 GB or more182,000 GB or more
48 GB or more218,000 GB or more
56 GB or more254,000 GB or more
64 GB or more290,000 GB or more
72 GB or more326,000 GB or more
About virtual cache partitions 5

To calculate CLPR data capacity:
Data capacity = number of 3D+1P parity groups x capacity of one HDD x 3 + number of 6D+2P
parity groups x capacity of one HDD x 6 + number of 7D+1P parity groups x capacity of one
HDD x 7 + number of 2D+2D parity groups x capacity of one HDD x 2
To calculate the cache capacity for a CLPR:
cache capacity (GB) = recommended cache capacity (GB) + ceiling (Cache Residency capacity
(MB) / 2,048) x 2 GB
When you use an external volume or a virtual volume, you cannot use the above formula. If you
use an external volume, calculate the capacity of parity group that is associated to the CLPR, and
then calculate the cache capacity according to the data capacity and the recommended capacity
in the above table. If you use a virtual volume, calculate the total LDEV capacity of the virtual
volume that is associated to the CLPR, and then calculate the cache capacity according to the data
capacity and the recommended capacity in the above table. To check the LDEV capacity of the
virtual volume, see the LDEV dialog box in the Reports Display dialog box of the Remote Web
Console subwindow. For further information about Remote Web Console subwindow, see the HP
StorageWorks P9000 Remote Web Console User Guide.
When adding cache memory, use either the Standard Cache Access Model mode or the High
Performance Cache Access Model mode. If your storage system has any additional printed circuit
boards (PCBs), you must use the High Performance Cache Access Model mode. For more information
about adding cache memory, contact HP Technical Support.
After installing and partitioning cache memory in one or more CLPRs, you may want to use Cache
Residency software to manage your cache. For more information, see the HP StorageWorks P9000
Performance for Open and Mainframe Systems User Guide.
Cache partitioning rules and guidelines
Observe the following rules, restrictions, and guidelines when creating cache logical partitions.
Rules
•To create cache partitioning, enable Cache Partition on your system.
•CLPR0 is the default CLPR in a storage system. If you have not yet created any cache logical
partitions, all cache belongs to CLPR0.
•Usually, you can create a CLPR if the subsystem has 4 GB cache. However, when creating a
CLPR while using Cache Residency, the remaining cache size, which is calculated by subtracting
Cache Residency size from the cache size of CLPR0, must be 8 GB or more.
•Adding or changing CLPR definitions or configurations may take hours to implement and
cannot be canceled or modified until all changes are complete. For assistance or for more
information, contact your HP account team.
Restrictions
The following operations are not allowed when multiple CLPRs are involved:
•Creating LUSE volumes across multiple CLPRs. If you forcibly perform this operation and create
a LUSE across multiple CLPRs, the LUSE volumes cannot be used for Continuous Access
Synchronous or Continuous Access Synchronous Z pair volumes.
•Business Copy Quick Restore operations that affect multiple CLPRs.
6 Creating virtual cache partitions

•A parity group containing LDEVs assigned to Cache Residency cache extents (cache areas)
cannot be migrated to another CLPR. See the HP StorageWorks P9000 Performance for Open
and Mainframe Systems User Guide for more information about cache extents.
•If you are using Continuous Access Journal, Continuous Access Journal data volumes and
journal volumes can belong to different CLPRs. All journal volumes in the same journal must
belong to the same CLPR. If not, an error occurs.
Guidelines
•Install any needed additional cache memory before partitioning cache. It will be difficult to
add additional cache memory after partitioning cache into CLPRs.
•If the cache capacity of defined CLPR is decreased by the Cache Residency cache area, cancel
the setting of bind mode or priority mode of Cache Residency, change the cache capacity of
CLPR, and then set the bind mode or priority mode again.
•When the Cache Residency is used with CLPR, HP recommends that you decide the remaining
cache capacity of each CLPR after subtraction of cache capacity for Cache Residency according
to Table 1 (page 5).
•Best practice is to create cache logical partitions either during the initial installation and setup
or during a maintenance window, because cache logical partition operations can significantly
degrade host performance. If you must perform such operations on a production machine,
use Performance Monitor to verify that the write pending rate, including spikes, is well below
30%. See the HP StorageWorks P9000 Performance for Open and Mainframe Systems User
Guide for more information.
Partitioning cache
Cache partition work flows
Creating a CLPR
1. Create a CLPR (see “Creating a CLPR” (page 7)).
2. Migrate resources to the new CLPR (see “Migrating resources to and from a CLPR” (page 8)).
Removing a CLPR
1. Migrate resources from the CLPR that is to be removed (see “Migrating resources to and from
a CLPR” (page 8)).
2. Delete the CLPR (see “Deleting a CLPR ” (page 9)).
Creating a CLPR
Before creating a CLPR, review “Cache partitioning rules and guidelines” (page 6).
1. Click Settings >Environmental Setting >Partition Definition on the menu bar of the Remote
Web Console main window.
2. Click to change the mode from View to Modify.
3. In Cache Partition, open the Partition Definition window, and select a CLPR in the Partition
Definition tree.
4. In the Cache Logical Partition window, right-click a CLPR from the Partition Definition tree and
select Create CLPR. This adds a cache logical partition to the Partition Definition tree. The
maximum number of CLPRs that can be manually created is 31 (not including CLPR0).
Partitioning cache 7

5. Select the newly created CLPR to open the Cache Logical Partition window.
6. In the Detail for CLPR Subsystem section, do the following:
•In CLPR Name, type the name of the cache logical partition, in up to 16 alphanumeric
characters.
•In Cache Size, select the cache capacity. You may select from 4 to 508 GB, in 2 GB
increments. The default value is 4 GB. The size of the cache is allocated from CLPR 0,
but you must leave at least 8 GB remaining in CLPR 0.
•In Cache Residency Size, select the cache capacity. You may select from 4 to 508 GB,
in 2 GB increments. The default value is 4 GB. The size of the cache is allocated from
CLPR0, but you must leave at least 8 GB remaining in CLPR0.
•In Num of Cache Residency Areas, type the desired capacity for the Cache Residency
area. The range of values is 0 to 16384 and the default value is 0.
7. Click Apply. The progress bar appears. The change in cache capacity is reflected in this cache
logical partition and in CLPR0.
8. To change the settings of an existing CLPR, repeat steps 5 through 7.
At this point, the CLPR has no parity groups. You can now migrate resources to the new CLPR (see
“Migrating resources to and from a CLPR” (page 8)).
Migrating resources to and from a CLPR
After adding a CLPR, you must migrate resources (parity groups) from existing CLPRs to the new
CLPR. Before deleting a CLPR, you must first migrate resources from that CLPR to CLPRs that will
not be deleted.
When migrating resources to and from cache logical partitions:
•The Auto LUN source and target LDEVs may or may not be in the same CU, but they must be
in different array groups.
•All interleaved parity groups must be in the same CLPR.
•LUSE volumes cannot be set across more than one CLPR.
•If a parity group contains one or more LDEVs that have defined Cache Residency extents, you
cannot migrate that parity group to another CLPR.
8 Creating virtual cache partitions

To migrate resources to and from a CLPR:
1. Click Settings >Environmental Setting >Partition Definition on the menu bar of the Remote
Web Console main window.
2. Click to change the mode from View to Modify.
3. Access the Logical Partition window, then select a CLPR from the Partition Definition tree.
4. In the Cache Logical Partition window, click Select CU to choose a CU.
5. Specify how you want to view information the CLPR resource list. In the Select CU dialog box,
choose one of the following:
•All CUs: Shows the information about all CUs on the CLPR resource list.
•Choose Specific CU, then specify the LDKC and the CU. This shows only CLPRs from the
selected CU.
•Unallocated: Shows information about only the CUs unallocated to CLPR on the CLPR
resource list.
6. Click Set to close the dialog box.
7. From the Cache Logical Partition Resource List, select one or more parity groups to be migrated,
then select Cut.
8. On the Partition Definition tree, right-click the CLPR to which you want to migrate resources,
and then select Paste Resources.
9. Click Apply. The progress bar appears.
Deleting a CLPR
Before deleting a CLPR, be sure to migrate any resources (for example, parity groups) to CLPR that
will not be deleted (see “Migrating resources to and from a CLPR” (page 8) for more information).
Unnecessary CLPRs may be deleted, but CLPR0 cannot be deleted.
To delete a CLPR:
1. Click Settings >Environmental Setting >Partition Definition on the menu bar of the Remote
Web Console main window.
2. Click to change the mode from View to Modify.
3. Select a CLPR in the Partition Definition tree to open the Cache Logical Partition window.
4. Right-click the CLPR that you want to delete and select Delete CLPR.
5. Click Apply. The progress bar appears.
Partitioning cache 9

2 Troubleshooting
This chapter describes some troubleshooting methods to use if you have problems creating a CLPR
with Cache Partition.
Troubleshooting Cache Partition
Displaying an error message
If the settings are wrong after you click Apply, an error message appears. After closing the message,
you can see the error detail.
To display an error message:
1. Right-click a CLPR on the Partition Definition tree, then select Error Detail to open the message.
2. Review the message and click OK to close the message.
General troubleshooting
The following table provides general troubleshooting instructions for Cache Partition operations.
Table 2 General troubleshooting for Cache Partition operations
CauseError
LUSE volumes cannot be set across more than one CLPR.When you attempt to migrate a parity group
to another CLPR, an LU warning message
appears.
You cannot assign the same name to more than one CLPR. The name you
entered is already being used or is reserved by a system. Enter another
name.
The CLPR name cannot be changed.
•Only open-system parity groups can be migrated.
•Make sure that all concatenated parity groups belong to the same
CLPR.
•Make sure to click Apply when creating a new CLPR.
The parity group in a CLPR cannot be
migrated to another CLPR.
10 Troubleshooting

3 Support and other resources
Contacting HP
For worldwide technical support information, see the HP support website:
http://www.hp.com/support
Before contacting HP, collect the following information:
•Product model names and numbers
•Technical support registration number (if applicable)
•Product serial numbers
•Error messages
•Operating system type and revision level
•Detailed questions
Subscription service
HP recommends that you register your product at the Subscriber's Choice for Business website:
http://www.hp.com/go/e-updates
After registering, you will receive e-mail notification of product enhancements, new driver versions,
firmware updates, and other product resources.
Documentation feedback
HP welcomes your feedback.
To make comments and suggestions about product documentation, please send a message to
[e-mail]. Include the document title and manufacturing part number. All
submissions become the property of HP.
Related information
The following documents [and websites] provide related information:
•HP StorageWorks P9000 Performance for Open and Mainframe Systems User Guide
•HP StorageWorks P9000 Remote Web Console User Guide
You can find these documents on the Manuals page of the HP Business Support Center website:
http://www.hp.com/support/manuals
In the Storage section, click Disk Storage Systems for hardware or Storage Software for software,
and then select your product.
HP websites
For additional information, see the following HP websites:
•http://www.hp.com
•http://www.hp.com/go/storage
•http://www.hp.com/service_locator
•http://www.hp.com/support/manuals
Contacting HP 11

•http://www.hp.com/support/downloads
•http://www.hp.com/storage/whitepapers
Conventions for storage capacity values
P9000 disk arrays use the following values to calculate physical storage capacity values (hard
disk drives):
•1 KB (kilobyte) = 1,000 bytes
•1 MB (megabyte) = 1,0002bytes
•1 GB (gigabyte) = 1,0003bytes
•1 TB (terabyte) = 1,0004bytes
•1 PB (petabyte) = 1,0005bytes
•1 EB (exabyte) = 1,0006bytes
P9000 disk arrays use the following values to calculate logical storage capacity values (logical
devices):
•1 KB (kilobyte) = 1,024 bytes
•1 MB (megabyte) = 1,0242bytes
•1 GB (gigabyte) = 1,0243bytes
•1 TB (terabyte) = 1,0244bytes
•1 PB (petabyte) = 1,0245bytes
•1 EB (exabyte) = 1,0246bytes
Typographic conventions
Table 3 Document conventions
ElementConvention
Cross-reference links and e-mail addressesBlue text: Table 3 (page 12)
Website addressesBlue, underlined text: http://www.hp.com
•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, tabs, and check boxes
Bold text
Text emphasisItalic text
•File and directory names
•System output
•Code
•Commands, their arguments, and argument values
Monospace text
•Code variables
•Command variables
Monospace, italic text
Emphasized monospace textMonospace, bold text
12 Support and other resources

WARNING! Indicates that failure to follow directions could result in bodily harm or death.
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.
Typographic conventions 13

A Cache Partition GUI reference
This appendix describes the windows of the Cache Partition GUI.
Partition Definition tab (Subsystem selected)
Use this tab to view detail about all of the cache logical partitions in the storage system. Information
appearing in this tab differs depending on what is selected in the Logical Partition tree.
•When Subsystem is selected, information about the selected storage system appears in the
resource list.
•When CLPR is selected, information about cache partition appears in the resource list.
•When a specific CLPR is selected, information about that CLPR appears in the resource list,
and the CLPR detail appears below the list.
To access this tab, from the Remote Web Console main window, click Go, then Environmental
Setting, and then click the Partition Definition tab.
DescriptionItem
A hierarchical list of storage system and cache logical partitions. CLPRs defined in the storage
system are indicated by an icon and a unique CLPR number.
Logical Partition tree
Provides information about the item selected in the Logical Partition tree. When Subsystem is
selected, the resource list provides the following information:
•No.: The storage system resource list number.
•Item: The resource type, for example, Storage Partition.
•Cache (Num. of CLPRs): The cache capacity, in GM, and number of cache logical partitions.
•Num. of Resources: Number of parity groups.
See also:
•“Partition Definition tab, Cache Logical Partition window (CLPR selected)” (page 15)
•“Partition Definition tab, Cache Logical Partition window (each CLPR’s information)” (page 15)
Resource list
Implements the settings made in this window.Apply
Cancels settings that were made in this window.Cancel
14 Cache Partition GUI reference

Partition Definition tab, Cache Logical Partition window (CLPR selected)
Use this window to view information about all of the cache logical partitions in the storage system.
This window opens when you select a CLPR in the Partition Definition tree of the Partition Definition
tab.
DescriptionItem
A hierarchical list of the cache logical partitions in the selected storage system. The CLPR
identifier, for example CLPR0, appears to the right of the CLPR icon ( ).
Partition Definition
tree
Information about the CLPR. When a CLPR is selected, the list provides the following information:
•No.: Line number.
•Resource Type: Resource type, for example, Cache Partition or Port.
•Name: Resource name. If the resource type is Cache Partition, the CLPR number and CLPR
ID appear.
•Properties: Capacity, in GB, and number of resources allocated to the selected CLPR.
•Information: Status of the selected CLPR. When the CLPR is created, Create appears. When
the CLPR is deleted, Delete appears.
Cache Logical
Partition resource list
Implements settings made in this window.Apply
Cancels settings made in this window.Cancel
Partition Definition tab, Cache Logical Partition window (each CLPR’s
information)
The Cache Logical Partition window appears below the resource list when you select a specific
CLPR in the Partition Definition tree of the Partition Definition tab. Use this window to view and
update CLPR resources. Parity groups, external volume groups, virtual volumes, the cache size, the
Cache Residency size and the number of Cache Residency areas are configured to CLPR.
Before changing cache size or cache residency size, verify that CLPR0 has at least 4 GB remaining
after subtracting cache residency size from the cache size.
Partition Definition tab, Cache Logical Partition window (CLPR selected) 15

DescriptionItem
Indicates either All CUs or the selected CU number.CU
Opens the Select CU dialog box.Select CU
A hierarchical list of all of the cache logical partitions in the storage system. The cache logical
partition number and name appear to the right of the CLPR icon ( ).
Partition Definition
tree
When a CLPR is selected in the Partition Definition tree, the Cache Logical Partition resource list
show the resource information for the selected CU and CLPR.
When CLPR0 is selected in the Cache Logical Partition tree, this list shows all resources not
already assigned to other partitions.
The resource list provides the following information:
•No.: Row number.
•Resource Type: Type of CLPR resources. Parity Group or V-VOL appears in this column.
•Address: Resource address.
An address with E (for example, E1-1) indicates that the parity group contains external
volumes.
An address with M (for example, M1-1) indicates that the parity group contains migration
volumes.
An address with V (for example, V1-1) indicates that the parity group contains Snapshot
virtual volumes.
An address with X (for example, X1-1) indicates that the parity group contains Thin
Provisioning virtual volumes.
•Properties: Properties of the parity group.
If a parity group contains internal volumes, the parity group and RAID configuration are
shown.
If a parity group contains external volumes, the volume capacity is shown, but the RAID
configuration is not shown.
For virtual volumes (for example, Snapshot or Thin Provisioning), the logical volume capacity
is shown, but the RAID configuration is not shown.
•Emulation: Emulation type of the resource.
Cache Logical
Partition resource list
16 Cache Partition GUI reference

DescriptionItem
When a CLPR is selected in the Partition Definition tree, the CLPR detail appears below the
resource list. Use this area to set or change the settings of the specified cache logical partition.
You cannot directly change the capacity value of CLPR0. Any changes in the capacity of the
other CLPRs are reflected as an opposite change in the capacity of CLPR0.
The maximum available cache capacity (installed cache capacity less the cache assigned to
other cache logical partitions) is shown for the upper limit of Cache Size, Cache Residency
Size, and Num. of Cache Residency Areas. For more information on cache residency, see the
HP StorageWorks P9000 Performance for Open and Mainframe Systems User Guide.
•CLPR Name: Allows you to set or change the name of the cache logical partition, provided
that it is within the selected CU. You can use up to 16 alphanumeric characters.
•Cache Size: Allows you to set or change the cache capacity of each cache logical partition.
You may select 4 GB or more up to a maximum size of 508 GB, which is 4 GB smaller than
the cache size of the whole storage system. From a default value of 4 GB you may increase
the size in 2 GB increments.
•Cache Residency Size: Allows you to set or change the capacity of the Cache Residency
cache. You may select nothing (0 GB) to a maximum of 504 GB, the Cache Residency size
of the entire storage system. The default value is 0 GB to which you may add capacity in
0.5 GB increments.
If you have previously defined cache residency size for this cache logical partition using
Cache Residency, the cache residency size selected for this cache logical partition must be
greater than that which was previously defined. Use Cache Residency to verify the size before
you set the value for this field.
•Num. of Cache Residency Areas: Allows you to set or change the number of cache residency
areas, from 0 to 16,384. The default value is zero (0).
If you have previously defined cache residency areas for this cache logical partition using
Cache Residency, the number of cache residency areas selected for this cache logical partition
must be more than that which was previously defined. Use Cache Residency to verify the
number of areas before you set the value for this field.
Detail For CLPR in
Subsystem
Implements settings made in this window.Apply
Cancels settings made in this window.Cancel
Select CU dialog box
Use this dialog box to select how you want CU information to appear on the CLPR resource list.
Open the Select CU Dialog box by clicking Select CU on the Cache Logical Partition Window.
Select CU dialog box 17

DescriptionItem
When selected, information about resources of all CUs appears on the CLPR resource list.All CUs
When selected, only information about resources that are associated with the specified CU
appears on the CLPR resource list.
•Use the LDKC list to specify LDKC.
•Use the CU list to specify CU.
Specific CU
When selected, only information about resources that are not assigned with any CU appears
on the CLPR resource list.
Unallocated
Implements the settings in the storage system.Set
Cancels settings made in this window.Cancel
18 Cache Partition GUI reference

Glossary
BC P9000 or XP Business Copy. An HP application that provides volume-level, point-in-time copies
in the disk array.
CLPR Cache logical partition.
Cnt Ac-J P9000 or XP Continuous Access Journal software.
Cnt Ac-J Z The version of Continuous Access Journal that supports mainframe volumes.
Cnt Ac-S P9000 or XP Continuous Access Synchronous software.
Cnt Ac-S Z The version of Continuous Access Synchronous that supports mainframe volumes.
CU Control Unit. Used to organize the storage space attached to the disk controller ( DKC). You can
group similarly configured logical devices (LDEVs) with unique control unit images (CUs). CUs
are numbered sequentially. The disk array supports a certain number of CUs, depending on the
disk array model. Each CU can manage multiple LDEVs; therefore, both the CU number and the
LDEV number are required to identify an LDEV.
DKC Disk controller.
DKU Disk Unit.
emulation mode The LDEVs associated with each RAID group are assigned an emulation mode that makes them
operate like OPEN system disk drives. The emulation mode determines the size of an LDEV or
volume.
OPEN-V: User-defined custom size
3390-3/3R: 2.838 GB
3390-9: 8.514 GB
3390-L: 27.844 GB
3390-M: 55.689 GB
3380-3 2.377 GB
HDD Hard disk drive.
LDKC Logical disk controller.
local disk A disk in the local array. Sometimes refers to a disk in a local host.
LUN Logical unit number. A LUN results from mapping a logical unit number, port ID, and LDEV ID to
a RAID group. The size of the LUN is determined by the emulation mode of the LDEV and the
number of LDEVs associated with the LUN.
parity group A set of hard disk drives that have the same capacity and that are treated as one group. A parity
group contains both user data and parity information, which enables user data to be accessed
if one or more drives in the group is not available.
PCB Printed circuit board.
remote instance The instance with which the local instance communicates, as configured in the HORCM_INST
section of the RAID Manager instance configuration file.
Remote Web
Console
A browser-based program installed on the SVP that allows you to configure and manage the disk
array.
synchronous Describes computing models that perform tasks in chronological order without interruption. In
synchronous replication, the source waits for data to be copied at the destination before
acknowledging that it has been written at the source.
V-VOL Virtual Volume.
VOL, vol Volume.
volume Volume on disk. An accessible storage area on disk, either physical or virtual.
XDF Extended distance feature (for ExSA channels).
19

Index
B
Business Copy
restrictions on quick restore operations across multiple
CLPRs, 6
C
cache
capacity recommendations, 5
partitioning example, 4
CLPR
creating, 7
CLPRs
deleting, 9
migrating resources, 8
restrictions, 6
contacting HP, 11
conventions
document, 12
storage capacity values, 12
text symbols, 13
D
deleting a CLPR, 9
disk arrays
supported models, 4
document
conventions, 12
related information, 11
documentation
HP website, 11
providing feedback, 11
H
help
obtaining, 11
HP
technical support, 11
I
interleaved parity groups
in CLPRs, 8
M
migrating resources, 8
O
operations not allowed with multiple CLPRs
restrictions, 6
R
related documentation, 11
restrictions
Business Copy quick restore operations across multiple
CLPRs, 6
operations not allowed with multiple CLPRs, 6
S
storage capacity values
conventions, 12
Subscriber's Choice, HP, 11
symbols in text, 13
T
technical support
HP, 11
service locator website, 11
text symbols, 13
troubleshooting CLPRs, 10
typographic conventions, 12
W
websites
HP , 11
HP Subscriber's Choice for Business, 11
product manuals, 11
20 Index