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Critical & Offline Disk Arrays
A fault-tolerant disk array—RAID 1, 1E, 5, 10, and 50—goes critical when a disk
drive is removed or fails. A RAID 6 or 60 disk array—goes degraded when a disk
drive is removed or fails and critical when two disk drives are removed of fail.
Due to the fault tolerance of the disk array, the data is still available and online.
However, once the disk array goes critical, the disk array has lost its fault
tolerance, and performance may be adversely affected.
If the fault was caused by a failed drive that was removed, the drive must be
replaced by another drive, either identical or larger, in order for the RAID system
to rebuild and restore optimal configuration.
If your fault-tolerant disk array – RAID 1, 1E, 5, 6, 10, 50, and 60 – goes offline,
contact ASUS Technical Support. See page 402.
A non-fault tolerant disk array—RAID 0—goes offline when a disk drive is
removed or fails. Since the disk array is not fault tolerant, the data stored in the
disk array is no longer accessible.
If one disk drive fails, all of the data on the disk array is lost. You must replace the
failed drive. Then, if the disk array had more than one disk drive, delete the disk
array and re-create it. Restore the data from a backup source.
When a Physical Drive Fails
ASUS Storage provides both audible and visual indicators to alert you of a disk
drive failure. The following will occur when a disk drive fails or goes offline:
•
The Global RAID Status LED changes from green to amber.
Figure 14. ASUS Storage front panel LEDs
Take no further corrective action until you have consulted with
ASUS Technical Support.
Warning
Power
Global Enclosure Status
Global RAID Status
384
Chapter 10: Troubleshooting
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