CMMVC9238E The volume specified is a thin volume in a data reduction pool. The -warning parameter can not be used.
Explanation
An attempt was made to use the -warning parameter of the chvdisk command to set a warning threshold for a thin-provisioned volume in a data reduction pool. This action is not permitted. However, you can set a warning threshold at the pool level.
User response
To set a warning threshold at the pool level, use the chmdiskgrp -warning command.