Time required for a rebuild, Abnormal termination of a rebuild – HP Smart Array P731m Controller User Manual
Page 25
Drive procedures 25
•
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 replacement drive LED behavior changes, the
Online/Activity LED changes from flashing steadily (1 Hz) to one of the following states:
o
On—The drive is inactive.
o
Flashing irregularly—The drive is active.
If the Online/Activity LED on the replacement drive does not illuminate while the corresponding LEDs on
other drives in the array are active, the rebuild process has terminated abnormally. The amber Fault LED
of one or more drives might also be illuminated.
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.