HP XP Array Manager Software - Manual (Page 187)

For details on the properties file, refer to the HP XP7 Command View Advanced Edition Administrator
Guide. To avoid insufficient memory, we recommend that you use the default.
The maximum number of volumes that can be displayed as migration target candidates is 2,000
volumes. Exceeding this value will produce an error.
The maximum number of volumes that can be displayed as migration source candidates is 500
volumes. Exceeding this value will produce an error.
Data migration tasks take a long time from start of execution to completion. This might affect the
performance of access from hosts to target volumes. To avoid executing such tasks while the access
frequency is high, check the time required to complete the tasks and set a task execution schedule
before registering the tasks. Actual required time might differ considerably in cases such as performing
migration for the first time, migrating a volume smaller than 170 GB, or migrating many volumes at
the same time.
When storage systems or hosts are under a heavy load, migration might fail. In this case, reduce the
load on the storage systems, and then perform data migration again.
If data migration fails, the integrity of data on the migration target cannot be ensured. Therefore, data
migration must be restarted.
If a data migration fails, and operations for the migration target such as re-execution of data migration
and volume allocation cannot be performed, the storage system must be refreshed.
Related topics
• About data migration , page 185
• Migrating data for volume performance , page 192
• Migrating data to a different storage system , page 193
Conditions for data migration
Data migration conditions include conditions that apply to all volumes (volume migration requirements),
and conditions that depend on the type of volume (volume migration requirements related to volume
type).
For some volumes, when you try to select those volumes as migration-source volumes, the reasons
why they cannot be selected as migration-source volumes are displayed on-screen.
Volume migration requirements
All volumes for which data migration is to be performed must meet the following conditions:
• Migration-source and migration-target volumes exist within one of the following storage systems
(chassis):
• HP XP7
• HP P9500
• XP24000/XP20000
• XP12000/XP10000/SVS200
• The emulation type, number of blocks, and size are the same for the source and target migration
volumes. However, note the following exceptions:
• If the micro version of XP24000/XP20000 is 60-03-20-00/00-xx or later and if both the mi-
gration source and the migration target volumes are THP/Smart volumes, the emulation type
can be between OPEN-V and OPEN-0V.
• If a volume whose emulation type is OPEN-V is a normal volume, and if the size of a migration
target volume is larger than a migration source volume, a volume that has the same size of the
User Guide 187