HP XP P9000 Command View Advanced Edition Software - Manual (Page 76)

• 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 at the migration target cannot be ensured. Therefore,
data migration must be performed again.
• If operations on a migration target volume, such as the re-execution of data migration and volume
allocation, cannot be performed after the data migration fails, the storage system must be refreshed.
Values for ensuring the operation of Tiered Storage Manager and recommended
values
The values below ensure the operation of Tiered Storage Manager. Performance might slow down
or memory might become insufficient if a value exceeds these values.
Table 6 Tiered Storage Manager operational values
Recommended value Value for which performance is ensured Item
30 or less 100
Number of tiers in a
single storage system
1,000 or less 1,300
Number of unused
volumes a tier
5 or less maximum of 500
Number of volumes that
can be migrated at once
N/A maximum of 2,000
Number of volumes that
can be displayed as can-
didates for migration tar-
get volumes
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):
• P9500 Disk Array
• 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.
Setting up and operating a SAN environment 76