### A drive is Defunct on controller [number], channel [number], SCSI ID [number].

Explanation: SCSI channel is not operational.

Action:

- Check in the following order:

- Power to external enclosures, connections
- Cables for proper seating
- Damage or bent or pushed pins, termination (for non-back plane systems), back planes, adapter and drives.

If no connection problems can be identified, then the replacement order for parts is termination (for non-back plane systems), cables, back planes, adapter and drives. Before replacing a drive or adapter ensure that they are updated with the latest firmware and still fail.