HP P9000 Bedienungsanleitung

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: AV400-96336

Published: January 2011

Edition: Third

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

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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

Contents

1 Creating virtual cache partitions...................................................................4

About virtual cache partitions.....................................................................................................4

Cache capacity for a CLPR....................................................................................................4

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 CLPRsdeletingdeleting a CLPR.........................................................................9

2 Troubleshooting........................................................................................10

Troubleshooting Cache Partition................................................................................................10

3 Support and other resources......................................................................11

Contacting HP........................................................................................................................11

Subscription service............................................................................................................11

Related information.................................................................................................................11

HP websites......................................................................................................................11

Conventions for storage capacity values....................................................................................12

Typographic conventions.........................................................................................................12

HP product documentation survey.............................................................................................13

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.

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.

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.

4 Creating virtual cache partitions

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 capacityProcessor bladeCLPR data capacity

8 GB or more2Less than 2,900 GB

16 GB or more4

24 GB or more6

32 GB or more8

16 GB or more2 or 42,900 GB or more

24 GB or more6

32 GB or more8

24 GB or more2, 4 or 614,400 GB or more

32 GB or more8

32 GB or more2, 4, 6 or 8128,000 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

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.

About virtual cache partitions 5

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.

•Auto LUN manual migration operations that affect multiple CLPRs.

•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.

6 Creating virtual cache partitions

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).

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.

Partitioning cache 7

•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 is appeared. 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:

•You can migrate resources only within the same CU.

•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.

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.

8 Creating virtual cache partitions

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 is appears.

Deleting a CLPR

Before deleting a CLPR, be sure to migrate any resources (e.g., 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 is appeared.

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

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