# Could not unblock logical drive [number] on controller [number].

## Explanation:

The specified logical drive could not be unblocked because of one of the following:

- The rebuild operation was not completed successfully.
- A hardware error occurred.

## Action:

Verify that the rebuild operation was completed successfully. If it did, then do the following:

1. Verify that the controller, cables, and physical drives are installed properly.
2. Verify that there is power to the physical drives.
3. Retry the command.
4. If the command still fails, restart the server and retry the command.

5. If the problem persists, contact your IBM service representative.

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