### Logical drive [number] is critical on controller [number].

Explanation: A physical drive in the specified logical drive is defunct. The data on this logical drive is at risk if another physical drive fails.

Action:

- If a rebuild is in progress, wait until the rebuild is complete.
- If a rebuild is not in progress, do the following:
  1. Verify that the controller, cables, and hard disk drives are installed properly.
  2. Verify that there is power to the drives.
  3. If any of the items in steps 1 and 2 were faulty, attempt to rebuild the failed physical drive to a new physical drive. Refer to the troubleshooting chapter of the IBM ServeRAID-4 Ultra160 SCSI Controller User's Reference.
     If any of the items in steps 1 and 2 were not faulty, contact your IBM service representative.