Hitachi VSP G1000 User Manual page 178

• You must not be maintaining the cache memory.
• The cache memory must be up and running.
• The I/O load to the V-VOL related to the pool must be low.
Procedure
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Hitachi Thin Image User Guide for Hitachi Virtual Storage Platform G Series and F Series
○ Simultaneously running CCI commands to decrease the pool capacity.
In the Explorer pane, click Storage Systems, expand the storage
system tree, and then click Pools.
In the Pools tab, click the name of the pool for which you want to
decrease capacity.
In the Pool Name window, in the Pool Volumes tab, from the list of
volumes, select the check box for the pool that contains the pool-VOLs
you want to delete to decrease pool capacity, and then click Shrink
Pool.
Note: You can select one or more pool volumes.
Monitoring and maintaining Thin Image