User manual

Chapter 5: RAID Monitoring and Maintenance
67
Array Critical
When a disk drive fails on a fault-tolerant array (RAID 1 and 0+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
icon to expand it.
2. Click on the Array
icon to expand it.
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 FastTrak
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 FastTrak TX Series User Manual for more information about
replacing a failed drive.
After you replace the failed drive, go on to Rebuild an Array, later in this
Chapter.