CMMVC6540E The task cannot be initiated because the thin-provisioned grain size is too small to accommodate the provisioned capacity that you have requested for the volume.

Explanation
The provisioned capacity that you requested requires a larger number of grains than the supported
maximum for the specified grain size.

User response
Either increase the grain size, decrease the requested provisioned capacity of the volume, or
both, and then resubmit the task.