HP XP Cache LUN Software User Manual

HP StorageWorks Cache LUN XP user guide

for the XP12000/XP10000/SVS200

Part number: T1716-96005 Fourth edition: June 2006

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Cache LUN XP user guide for the XP12000/XP10000/SVS200

About this guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Supported storage platforms and firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Intended audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Prerequisites. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Related documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Document conventions and symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

HP technical support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Subscription service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

HP web sites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Documentation feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1 Cache LUN Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Supported volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Cache LUN XP tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Supported emulation types and other parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Supported emulation types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Modified volume types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Unit of cache area allocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Number of cache areas allowed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Restrictions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Cache LUN XP support requirements for CU groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Cache LUN XP modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Priority mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Priority mode details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

General cache capacity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Bind mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Bind mode details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Bind mode and RAID groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Pre-staging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Required cache size for Cache LUN XP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Open systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Mainframe systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Starting Cache LUN XP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Cache LUN pane. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

CLPR drop-down list. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Prestaging check box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

LDEV tree. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

LDEV table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Cache LUN XP pie chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Cache settings section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Setting (creating) a cache extent. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Releasing (removing) a cache extent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Changing an extent’s mode and pre-staging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Figures

1 Cache LUN XP operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Example of LBA value setting with LUSE volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3 Cache LUN pane. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4 Multi Set pane. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

5 Multi Release window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Cache LUN XP user guide for the XP12000/XP10000/SVS200 3

Tables

1 Document conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2 Restrictions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3 Cache LUN XP icons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

About this guide

This guide provides information about:

• Perparing for Cache LUN XP operations

• Performing Cache LUN XP operations

Supported storage platforms and firmware

In this guide, the term array refers to the following storage platforms:

• HP StorageWorks XP12000 Disk Array

• HP StorageWorks XP10000 Disk Array

• HP StorageWorks 200 Storage Virtualization System

For information about required firmware versions, see the HP StorageWorks XP Remote Web Console user guide for XP12000/XP10000/SVS200.

Intended audience

This guide is intended for customers and HP-authorized service providers with knowledge of the following:

• 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.

Prerequisites

Prerequisites for using this product include:

• Installation of the HP StorageWorks disk array(s)

• Installation of the license key for this product

Document conventions and symbols

Table 1 Document conventions

Convention Element

Blue text: Table 1 Cross-reference links and e-mail addresses

Blue, underlined text: (http://www.hp.com) Web site addresses

Bold text • Keys that are pressed

Italic text Text emphasis

Monospace text • File and directory names

Monospace, italic text • Code variables

Monospace, bold text Emphasized monospace text

• 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

• System output

• Code

• Commands, their arguments, and argument values

• Command variables

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 web site:

http://www.hp.com/support/

Collect the following information before calling:

• Technical support registration number (if applicable)

• Product serial numbers

• Product model names and numbers

• Applicable error messages

• Operating system type and revision level

• Detailed, specific questions

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 web site:

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.

HP web sites

For additional information, see the following HP web sites:

• http://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 comments and suggestions about product documentation, please send a message to

storagedocs.feedback@hp.com. All submissions become the property of HP.

Cache LUN XP user guide for the XP12000/XP10000/SVS200 7

1 Cache LUN Introduction

Use HP StorageWorks Cache LUN XP to reserve areas of cache memory on the disk array for storing high-use data from the LDEVs. Data access speed is improved because the cache-resident data is available to the hosts at much faster transfer speeds. This can be applied to both read and write I/O operations.

Supported volumes

Cache LUN XP works with normal volumes, LUSE volumes, and custom volumes (configured through CVS).

Use custom volumes and Cache LUN XP together to achieve higher data access performance (than when these features are used separately).

Cache LUN XP tasks

Use Cache LUN XP to perform the following tasks:

• ”Setting (creating) a cache extent” on page 18

• ”Releasing (removing) a cache extent” on page 20

• ”Changing an extent’s mode and pre-staging” on page 21

Figure 1 Cache LUN XP operations

Cache LUN XP requires a portion of cache memory, called the Cache LUN XP cache area. You can change the capacity of the Cache LUN XP cache area when installing or removing cache memory.

Typically, data assigned to Cache LUN XP becomes resident (staged) in cache after it is first accessed by a host. Then, the host finds the data in cache for the second and subsequent accesses.

Another function, called pre-staging, puts data in the Cache LUN XP cache area when the data is first set up for caching. Pre-staging allows the host to find data in the cache at the first access.

Cache areas (also called cache extents) can be added or removed at any time. Each cache extent is defined as a range of logical blocks within an LDEV or as an entire LDEV. Logical blocks are defined by starting and ending Logical Block Addresses (LBAs).

Supported emulation types and other parameters

Supported emulation types

Supported open system emulation types are OPEN-3, OPEN-8, OPEN-9, OPEN-E, OPEN-L, and OPEN-V.

Supported mainframe emulation types are 3390-3, 3390 -3A, 3390-3B, 3390-3C, 3390-3R, 3390-9, 3390-9A, 3390-9B, 3390-9C, 3390-L, 3390-LA, 3390-LB, 3390-LC, 3390-M, 3390-MA, 3390-MB, and 3390-MC.

Modified volume types

LUSE (LU Size Expansion) and CVS (custom volume size) volumes can be placed in the Cache LUN XP cache area.

If you want to apply Cache LUN XP to a LUSE volume, you must apply Cache LUN XP to all the LDEVs that form the LUSE volume.

Cache LUN XP user guide for the XP12000/XP10000/SVS200 9

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