text: 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. 