HP P9000 Tiered Storage Manager Software 7.4.1-00 CLI Reference Guide (TB585-96029, April 2013)

• The number of THP volumes in the migration target pool is less than the maximum value (HP P9500:
63,232; XP24000/XP20000: 8,192).
• The maximum over-provisioning percent in the migration target pool must not exceed the warning
threshold for the over-provisioning percent and the upper limit for the over-provisioning percent.
This condition also applies after migration.
If the migration source includes THP pool volumes, the following condition must also be satisfied:
• The same THP pool cannot contain both migration source and target volumes.
When the migration source is a THP volume and the setting is specified to automatically erase the
data after a migration, all the data will be deleted from the migration source volume. After that, both
the THP volume and the virtual parity group will be deleted. However, for XP24000/XP20000 storage
systems, when multiple volumes exist in the virtual parity group, whether the volumes and the virtual
parity group are deleted differs, depending on whether XP Virtual LVI/LUN (VLL) and Volume Shredder
have been installed.
• If XP Virtual LVI/LUN (VLL) and Volume Shredder have been installed: The virtual parity group will
be deleted after the last THP volume is deleted.
• If XP Virtual LVI/LUN (VLL) and Volume Shredder have not been installed: A message indicating
that the volumes cannot be deleted (KATS50388-E) will be output.
Conditions for migrating data from LUSE volumes
Tiered Storage Manager software allows LUSE volumes to be specified as migration sources. If LUSE
volumes are specified as migration sources, the following conditions must be met:
• The migration target volumes must be either all internal volumes or all external volumes.
• All the migration target volumes must have the same I/O suppression mode, cache mode, and
CLPR.
• The migration target volumes must not be THP volumes.
In addition, to automatically create migration-source and migration-destination pairs, we recommend
making sure that both of the following conditions are satisfied in advance:
• If the migration target volumes are external volumes, all the volumes must be in the same external
storage system.
• All the migration target volumes must have the same RAID level, drive type, and SLPR.
Reference information during operations194