HP XP P9500 Storage - Manual (Page 103)

Rebalancing the usage level among pool-VOLs
The usage level among pool-VOLs is rebalanced automatically so that the page usage ratio is
averaged across pool-VOLs. Therefore, the loads of pool-VOLs are distributed. The usage level
among pool-VOLs is automatically rebalanced in the following cases:
•
Expanding pool-VOLs
•
Shrinking pool-VOLs
•
Reclaiming zero pages
Performance of the host I/O may decrease due to movement of the existing data. If you do not
want to automate balancing of the usage level of pool-VOLs, call the HP Technical Support. You
can see the rebalancing progress of the usage level among pool-VOLs in the View Pool Management
Status window (see
(page 327) . Thin Provisioning automatically stops balancing the usage levels
among pool-VOLs if the cache memory is not redundant or the pool usage rate reaches up to the
threshold.
Execution mode settings and tiering policy
The follow depicts how tier relocation is performed after changing the tiering policy setting while
Auto execution mode is used.
The following depicts two cases of how tier relocation is performed after changing the tiering policy
setting while Manual execution mode is used.
Smart Tiers 103