CMMVC9663E The FlashCopy® mapping could not be prepared or started because the source and target VDisks are different sizes.
Explanation
The FlashCopy function creates copies of content on a source volume to a target volume when they both have the same virtual capacity.Note: If an attempt to expand the size of a volume fails while it is replicated, then that
volume can have an internal capacity greater than the provisioned capacity. In this scenario, the
internal capacity is used to determine the error condition. See the lsvdisk command to verify internal_capacity and
capacity fields.