Time required for a rebuild, Abnormal termination of a rebuild – HP Smart Array P431 Controller User Manual
Page 27
Drive procedures 27
•
Failure of a second drive in a RAID 6 configuration
Time required for a rebuild
The time required for a rebuild varies, depending on several factors:
•
The priority that the rebuild is given over normal I/O operations (you can change the priority setting by
using HP SSA)
•
The amount of I/O activity during the rebuild operation
•
The average bandwidth capability (MBps) of the drives
•
The availability of drive cache
•
The brand, model, and age of the drives
•
The amount of unused capacity on the drives
•
For RAID 5, RAID 50, RAID 6, and RAID 60, the number of drives in the array
•
The strip size of the logical volume
CAUTION:
Because data rebuild time ranges from 200 to 520 GB/h, the system could be
unprotected against drive failure for an extended period during data recovery or a drive capacity
upgrade. When possible, perform rebuild operations only during periods of minimal system
activity.
When automatic data recovery has finished, the drive status LED changes from flashing green to solid green.
If the drive status LED on the replacement drive changes to flashing or solid amber, the rebuild process has
terminated abnormally.
If an abnormal termination of a rebuild occurs, identify the cause and appropriate corrective steps in
"Abnormal termination of a rebuild (on page
)."
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 drive status LED.
One of the drives in the array has
experienced an uncorrectable read error.
The replacement drive has an
illuminated amber drive status LED.
The replacement drive has failed.
One of the other drives in the array has
an illuminated amber drive status 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.