CMMVC9454E The command failed because one or more HyperSwap® volumes have a copy or a change volume in this pool that must be removed first.

Explanation
This error can occur when an attempt is made to force the deletion of a storage pool that
contains HyperSwap volume copies.

User response
Use the rmvolumecopy command to remove all HyperSwap volume copies in the pool, and then retry the command.