Western Digital Array Management Setup User Manual page 53

Array Critical
When a disk drive fails on a fault-tolerant array (RAID 1) for any reason, the Array goes
Critical. The array can still read and write data but fault tolerance has been lost.
An Array Critical icon displays in Tree View and the alarm (if enabled) beeps quickly to
call your attention to the condition.
Your first action is to identify which disk drive has failed.
1. Click on the Controller
2. Click on the Array Critical
3. Observe and compare the disk drives currently displayed with those originally assigned to
the Array.
In the example above, there are two disk drives attached to the WD SATA RAID Controller
and both are assigned to a RAID 1 array.
The disk drive on Channel 2 does not appear. This is the failed drive.
If you have a Hot Spare drive installed and enabled, the array will begin to Rebuild
!
automatically.
If you do not have a Hot Spare drive, you must replace the failed drive before a Rebuild of
!
the array can begin.
Refer to the WD SATA Controller User Manual for more information about replacing a failed
drive.
After you replace the failed drive, go on to "Rebuild an Array" on page 51.
icon to expand it.
icon to expand it.
CHAPTER 5: RAID MONITORING AND MAINTENANCE WITH AMS - 49
WD ARRAY MANAGEMENT SETUP
USER MANUAL