# Recovering from defunct drives

If multiple physical drives fail at the same time in the same array, or if the defunct drives are not part of an array, contact your IBM service representative.

If a physical drive fails in an array or multiple physical drives fail in separate arrays (one physical drive per array), do the following:

1. Replace each defunct physical drive. The ServeRAID controller starts the rebuild operation when it detects the removal and reinsertion of a drive that is part of an array.
2. If a rebuild operation is in progress, wait until the rebuild is complete. Otherwise, go to step 3.
   Note: If you are replacing multiple defunct drives, you must wait for each rebuild operation to complete before starting subsequent rebuild operations.
3. Verify the cables, physical drives, and controllers are installed properly.
4. Attempt to rebuild the defunct physical drive by performing a hot-swap rebuild.
5. If the hot-swap rebuild fails, contact your IBM service representative.

## More information

- Rebuilding a defunct drive
- Rebuilding a hot-swap drive
- Changing the rebuild rate (action)
- Unblocking a logical drive (action)
- RAID level-0
- RAID level-1
- RAID level-5

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