Hp XP20000XP24000 Disk Array Manuel d'utilisateur télécharger pdf (Page 12)

group or volume usage varies only slightly, or for cases in which overall DKP or DRR usage is

relatively high.

• From an open-system host, users can also use HP StorageWorks XP RAID Manager to perform

manual volume migration by using commands. To perform volume migration by RAID Manager,

Auto LUN should be installed on the storage system. For details on manual volume migration by

using RAID Manager, see “Using RAID Manager for Manual Volume Migration” on page 45. For

details on RAID Manager, see HP StorageWorks XP RAID Manager User’s Guide.

Caution:

When an error condition exists in the storage system, resource usage can increase or become

unbalanced. Do not use data collected during an error condition as the basis for planning Auto LUN

operations.

Manual Volum

eMigration

Auto LUN enab

les you to balance workloads among parity groups to improve system performance. To

balance wor

kloads, you select high-usage volumes from a high-usage parity group and then move

the volumes

to a different parity group.

This secti

on explains how to migrate volumes in parity groups manually, citing usage rates before and

after migr

ation.

Note:

You can also migrate an external volume manually. However, you cannot examine the estimated

usage rate after migration because the usage rate of an external volume cannot be collected.

Before migrating a volume from one parity group to another, you must create a migration plan. When

you create a migration plan, you specify the following:

• a volume for migrating

• the migra

tion destination for the speciﬁed volume

To migrate volumes, you execute your migration plan.

Figure 2 on page 12 gives an example of a migration plan as it would be displayed in the Manual Plan

window of Auto LUN. In this ﬁgure, Source LDEV indicates the volume that should be migrated. Target

LDEV indicates the migration destination for the volume in Source LDEV.

Figure 2AnExample of MigrationPlans Displayedinthe Auto LUNWindow

Before you create a migration plan, you must determine which volume should be migrated to which parity

group. When you determine a volume to be migrated, do the following:

1. Check usage rates for volumes (Figure 3 on page 12).

2. Choose a volume to be migrated from among high-usage volumes.

Figure 3 Usage Rate for a Volume Displayed in the Window

3. After determining a migration destination, ﬁnd fast parity groups (that is, fast hard disk drives).

Next, you should choose a low-usage parity group from the fast parity groups.

About Auto LUN Operations

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