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Replacing, moving, or adding hard drives 16
• The brand, model, and age of the drives
• The amount of unused capacity on the drives
Allow approximately 15 minutes per gigabyte for the rebuild process to complete.
System performance is affected during the rebuild, and the system is unprotected against further drive
failure until the rebuild has finished. Therefore, replace drives during periods of low activity, when
possible.
When automatic data recovery has finished, the state of the logical volume is updated in ACU/ACU-CLI
/agents, and an event is posted to the system event log indicating that the rebuild is complete.
If the ACU/ACU-CLI/agents or the posted event indicate that the rebuild has terminated abnormally,
determine the appropriate course of action. See "Abnormal termination of a rebuild (on page 16)."
Abnormal termination of a rebuild
If the rebuild process has been terminated abnormally, an event is reported in the system event log and
the array remains in interim recovery mode.
Three possible causes exist for abnormal termination of a rebuild:
Posted event Cause of rebuild termination
None of the drives in the array are
marked as failed in ACU/ACU-CLI.
One of the drives in the array has
experienced an uncorrectable read error.
The replacement drive is marked as
failed in ACU/ACU-CLI.
The replacement drive has failed.
One of the other drives in the array is
marked as failed.
The drive with the illuminated Fault LED has
now failed.
Each of these situations requires a different remedial action.
One of the drives in the array has experienced an uncorrectable read error.
To resolve this issue:
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 the 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, do the following:
1. Delete and recreate the logical drive.
2. Restore data from the backup.
The replacement drive has failed.
Verify that the replacement drive has the correct capacity and is a supported model. If these factors are
not the cause of the failure, use a different drive as the replacement.
Another drive in the array has failed.