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Drive procedures 85
Abnormal termination of a rebuild
If the activity LED on the replacement drive permanently ceases to be illuminated even while other drives in
the array are active, the rebuild process has terminated abnormally. The following table indicates the three
possible causes of abnormal termination of a rebuild.
Observation Cause of rebuild termination
None of the drives in the array have an
illuminated amber LED.
One of the drives in the array has
experienced an uncorrectable read error.
The replacement drive has an
illuminated amber LED.
The replacement drive has failed.
One of the other drives in the array has
an illuminated amber LED.
The drive with the illuminated amber LED has
now failed.
Each of these situations requires a different remedial action.
Case 1: An uncorrectable read error has occurred.
1. Back up as much data as possible from the logical drive.
CAUTION: Do not remove the drive that has the media error. Doing so causes the logical drive
to fail.
2. Restore data from backup. Writing data to the location of the unreadable sector often eliminates the
error.
3. Remove and reinsert the replacement drive. This action restarts the rebuild process.
If the rebuild process still terminates abnormally:
1. Delete and recreate the logical drive.
2. Restore data from backup.
Case 2: The replacement drive has failed.
Verify that the replacement drive is of the correct capacity and is a supported model. If these factors are not
the cause of the problem, use a different drive as the replacement.
Case 3: Another drive in the array has failed.
A drive that has recently failed can sometimes be made temporarily operational again by cycling the server
power.
1. Power down the server.
2. Remove the replacement physical drive (the one undergoing a rebuild), and reinstall the drive that it is
replacing.
3. Power up the server.
If the newly failed drive seems to be operational again:
1. Back up any unsaved data.
2. Remove the drive that was originally to be replaced, and reinsert the replacement physical drive. The
rebuild process automatically restarts.
3. When the rebuild process has finished, replace the newly failed drive.
However, if the newly failed drive has not recovered:
1. Remove the drive that was originally to be replaced, and reinsert the replacement physical drive.
2. Replace the newly failed drive.