HP XP Array Manager Software - Manual (Page 207)

The values below ensure the operation of Tiered Storage Manager in Legacy mode. Performance
might slow down or memory might become insufficient if a value exceeds the maximum value.
Table 22 Data migration operational values in Legacy mode
Recommended value Maximum value Item
100 or less 5,000 Number of migration groups in storage domain.
5 or less 300 Number of volumes in migration group.
- 100
Number of incomplete TSMgr CLI/Legacy TSMgr
Tasks.
The following indicates the maximum value and recommended user count when using Tiered Storage
Manager in Legacy mode.
Table 23 Tiered Storage Manager user count values in Legacy mode
Recommended value Maximum value Item
1 or 2 5
Number of users that access the Tiered Storage Man-
ager server at the same time.
Data migration tasks take a long time from start of execution to completion. This might affect the
performance of the 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 performed again.
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 Legacy mode , page 205
• Conditions for data migration in Legacy mode , page 207
Conditions for data migration in Legacy mode
The conditions for data migration in Legacy mode 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, the reasons why they cannot be selected as migration-source volumes or
migration-target volumes are displayed on-screen.
Volume migration requirements
All volumes for which data migration is to be performed in Legacy mode must meet the conditions
below:
User Guide 207