CMMVC9235E: The pool specified is a data reduction pool. Volumes or volume copies which are thin
provisioned and created from a data reduction pool can not use the -grainsize parameter.
Explanation
You cannot create thin-provisioned volumes or volume copies that use the
-grainsize parameter. This type of volume or volume copy is created with a
mandatory grain size of 8 KB.
User Response
Retry the command without the -grainsize parameter.