Hi,
Try
>>>Vol status -f
--- If you are unable to see the Disk and it is not present in the below command as well.
>>>Vol status -s
---If your disk is not available here too,
Then try
>>>disk show -n or disk show <disk id >
--- mostly you will get the disk not owned status over here...
Assign the same back to storage array.
>>>disk assign <disk id>
---after this cross check in again with disk show <disk id > , and it will come under storage | spare pool.
--------------------- If you want to get rid of messages coming from DFM, Just go to that alert and Acknowledge the message, so that it wont trigger u again.