IBM TOTAL STORAGE DS8000 - Manual (Page 175)

Action
Monitor system status, and resubmit the task when both servers are online. If the
problem persists, contact IBM technical support for assistance.
CMUN02019E SOURCE Cannot exceed maximum volume group count
Explanation
The maximum volume group count has been reached. A new volume group cannot
be created.
Action
Remove unused volume groups, and then resubmit the task.
CMUN02020E SOURCE Unable to create logical subsystem: ID already
in use.
Explanation
The logical subsystem cannot be created because the specified ID is already in
use.
Action
Specify a different logical subsystem ID, and then resubmit the task.
CMUN02021E SOURCE Unable to create logical volume: the volume
number already exists.
Explanation
The specified logical volume exists already.
Action
Specify a different volume number, and then resubmit the task.
CMUN02022E SOURCE Unable to create array
Explanation
The storage management console server reports a storage unit microcode-level
error.
Action
Contact IBM technical support for assistance.
Chapter 7. DS storage management console server messages 155