HP Dynamic Smart Array Controllers - Manual (Page 23)

Replacing, moving, or adding hard drives 23
• The amount of I/O activity during the rebuild operation
• The rotational speed of the hard drives
• The brand, model, and age of the drives
• The amount of unused capacity on the drives
• In RAID 5 configurations, the time required for a rebuild may be affected by data parity initialization.
IMPORTANT: RAID 5 is available only when the optional 512 MB FBWC module is installed. For
more information, see "Upgrading to 512 MB FBWC (on page 7 )."
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 23 )."
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.