HP XP Array Manager Software - Manual (Page 47)

The source volume can be selected by host or by logical group. The source volume also can be selected
from some of the volumes allocated to a host some of the volumes in a logical group, some of the
volumes in a tier. Migration source volumes can also be selected from volume search results. Only
volumes that can be migrated will be migrated.
Migration targets are selected from tiers, THP pools, or resource search results. If THP pools are
selected, THP volumes with the same capacity as the migration-source volumes are automatically
created. The existing THP volumes also can be specified as migration targets.
Note the following:
• When the migration source and the migration target are selected, individual pairs of migration
source volumes and migration target volumes (or THP pools) are automatically created. Altough,
you can change these pairs, pairs of volumes that cannot be migrated will not be created.
• During migration, data can still be accessed.
• When data migration is completed normally, the LDEV ID and host I/O of the migration source
volumes are changed to those of the migration target volumes. The procedure for accessing migrated
data is not changed before or after migration.
• If linked with HP StorageWorks P9000 Performance Advisor software, parity group busy rate for
the migration source volume and migration target volume can be checked.
• When you create a tier, you specify resource conditions. A tier that has been created by specifying
the following attributes cannot be selected as a migration target:
• If you specified one of the following attributes for volumes:
- Storage type
- Port
- Host group
• If you specified one of the following attributes for THP pools:
- Storage type
- Drive type
- Drive speed (RPM)
- RAID level
- Storage system
• After migrating, you can delete the data of the source volumes.
• After volumes are migrated to a THP pool, unused capacity in the target volumes is returned to
the pool (zero page reclaim) if the zero page reclaim option is on.
• You cannot work with volumes (such as copy pair or volume allocation) until the migration tasks
are completed.
You must have an HP StorageWorks P9000 Tiered Storage Manager software license registered to
perform Data Migration.
For details about data migration in Legacy mode, using migration groups earlier than v7.1.1, see
"About legacy mode".
Notes on migrating data
• The number of volumes that are candidates for migration target volumes are narrowed down and
displayed when selecting a migration target volume. If you want to display all the volumes, set a
value for the
migration.plan.candidateVolumeCountLimit property in the migra-
tion.properties file. For details on the properties file, refer to the HP P9000 Command View
Advanced Edition Suite Software Administrator Guide. To avoid insufficient memory, we recommend
that you use the default.
User Guide 47