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Progress value, Effects on other xp products, Table 8 the estimated delay in the copying speed – HP StorageWorks XP Remote Web Console Software User Manual

Page 23: Maintenance, Auto migration parameters, Powering off disk arrays, 8 the estimated delay in the copying speed

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Auto LUN XP user guide for the XP12000/XP10000

23

Progress value

If a volumes with heavy and light workloads are migrated together, the migration might not complete (even

though the progress value indicates 100%). If this happens perform one of the following tasks.

Reduce the workloads between hosts and the disk array and complete the migration.

Stop the migration for the volume with heavy workloads, migrate the other volume, and then retry the

migration which has been stopped.

Effects on other XP products

When the workloads for update I/Os between hosts and the disk array are heavy, longer time will be

required to complete the volume migration because the copy of differential data is repeatedly executed.

Longer copying times may be required for other XP products when this copy of differential data is

executed. These XP products include: Auto LUN XP, Business Copy XP, ShadowImage for z/OS®,

Compatible Mirroring for IBM® FlashCopy®, and Flex Copy XP.
See

Figure 8

for the amount of affected copying time. The copying time of other XP products depends on

the number of pairs set to the XP product, however, the copying time may be increased up to twice.

Maintenance

Do not perform Auto LUN XP migration operations during disk array maintenance activities (for example,

cache or drive installation, replacement, de-installation, or replacement of the microprogram).

Auto migration parameters

Auto migration parameters are initialized when the disk array configuration is changed (for example, when

new drives or LDEVs are installed). Parameters include disk usage limit and migration time. After a change

is made to the subsystem configuration, you must specify auto migration parameters again.

Powering off disk arrays

To turn the power off at the disk array, ensure that volume migration is finished. If migration is not finished,

HP strongly recommends that you do not turn off the power until the migration is finished.
If you turn the power off while migration is in progress, data migration stops and some of the data are not

migrated. If you turn the power on later, Auto LUN XP resumes data migration. If data remains in shared

memory, which is volatile memory, Auto LUN XP attempts to copy only data that have not been migrated to

the migration destination. However, if data is lost from shared memory, Auto LUN XP attempts to copy all

data to the migration destination; therefore, the copy operation takes more time. Auto LUN XP attempts to

Table 8

The estimated delay in the copying speed

Capacity of Migrated Volume (MB)

Estimated delay in the copying

speed (in minutes)

0 - 1,000

4

1,001 - 5,000

18

5,001 - 10,000

37

10,001 - 50,000

186

50,001 - 100,000

372

100,001 - 500,000

1860

500,001 - 1,000,000

3720

1,000,001 - 2,150,400

9667

The above estimates are calculated based on the assumption that the

workload for update I/Os for the migrated volume is 50 IOPS for one volume.

This manual is related to the following products: