CMMVC9354E The command failed because the array has an expansion ongoing.

Explanation
This error can occur when an attempt is made to start another array expansion or to change
members of a managed disk while an array expansion is already in progress.

User response

To remove a drive from membership in the array, use the chdrive -failed
command.

To change the membership of the array, use the charraymember -immediate
command.

To expand the array, wait until the current expansion process completes, and then retry the
command. You can monitor the expansion process by using the
lsarrayexpansionprogress command.