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

## Explanation:

A physical drive is defunct in the specified logical drive. The data on this logical drive is at risk. If another physical drive fails, the data might be lost.

## Action:

- If a rebuild operation is in progress, wait until the rebuild is complete.
- If a rebuild operation is not in progress, replace the failed physical drive with a new physical drive. After the physical drive is replaced, a rebuild operation will start automatically. Refer to the troubleshooting chapter of the IBM ServeRAID-4 Ultra160 SCSI Controller User's Reference.

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