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

## Explanation:

- There was an error in communication between the physical drive and the controller.
- The controller failed.

## Action:

1. Verify that there is power to external enclosures and connections.
2. Verify that cables are properly seated.
3. Check for damaged, bent, or pushed pins on the following:
   - Termination (for non-backplane systems)
   - Backplanes
   - Physical drives
   - Controller

If you cannot identify a connection problem, the replacement order for parts is the following:

1. Termination (for non-backplane systems)
2. Cables
3. Physical drives
4. Backplanes
5. Controller

Before replacing a physical drive or controller, verify that it is updated with the latest firmware (microcode) and that they still fail.
Note: If multiple physical drives are marked defunct within the same time period, check the cables and backplanes.

Glossary | Contents

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