206 Implementing the IBM Storwize V7000 with IBM Spectrum Virtualize V8.2.1
Example 6-10   chmdiskgrp to rename child pool
IBM_Storwize:ITSOV7K:superuser>chmdiskgrp -name Pool0_child_new -size 45056 
Pool0_child0
IBM_Storwize:ITSOV7K:superuser>
Deleting a child pool is a task similar to deleting a parent pool. As with a parent pool, the 
Delete action is disabled if the child pool contains volumes, as shown in Figure 6-22. 
Figure 6-22   Deleting a child pool
After you delete a child pool, the extents that it occupied return to the parent pool as free 
capacity.
To delete a child pool with the CLI, use rmmdiskgrp.
Migrating volumes to and from child pools
To move a volume to another pool, you can use migration or volume mirroring in the same 
way you use them for parent pools. For more information about volume migration and volume 
mirroring, see Chapter 7, “Volumes” on page 241.
The system supports migration of volumes between child pools within the same parent pool 
or migration of a volume between a child pool and its parent pool. Migrations between a 
source and target child pool with different parent pools are not supported. However, you can 
migrate the volume from the source child pool to its parent pool. The volume can then be 
migrated from the parent pool to the parent pool of the target child pool. Finally, the volume 
can be migrated from the target parent pool to the target child pool. 
During a volume migration within a parent pool (between a child and its parent or between 
children with same parent), there is no data movement but only extent reassignments.
Volume migration between a child storage pool and its parent storage pool can be performed 
in the Volumes menu, on the Volumes by Pool page. Right-click a volume and choose to 
migrate it into a suitable pool. 
In the example on Figure 6-23 on page 207, volume child_volume has been created in child 
pool Pool0_child0. Notice that child pools appear exactly like parent pools in the Volumes by 
Pool pane.