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Chapter 8: Troubleshooting
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Critical & Offline Logical Drives
A fault-tolerant logical drive—RAID 1, 3, 5, 10 and 50—goes critical when a drive
is removed or fails. Due to the fault tolerance of the logical drive, the data is still
available and online. However, once the logical drive goes critical, the logical
drive 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 logical drive goes offline, go to the Promise website
(www.promise.com) and download a document called
Array Recovery
Procedure
.
A non-fault tolerant logical drive—RAID 0—goes offline when a drive is removed
or fails. Since the logical drive is not fault tolerant, the data stored in the logical
drive is no longer accessible.
If one disk drive fails, all of the data on the logical drive is lost. You must replace
the failed drive. Then,if the logical drive had more than one disk drive, delete the
logical drive and re-create it. Restore the data from a backup source.
When a Disk Drive Fails
VTrak 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 Logical Drive LED changes from green to amber
•
The Disk Carrier Status LED changes from green to red
•
The audible alarm repeatedly sounds two short beeps
•
WebPAM PRO and the CLU report the condition
Rebuild
Normally, the logical drive will begin rebuilding automatically. You can access
your logical drive during this time but read/write performance might be slower
than normal.
•
If a hot spare drive is provided and enabled, the controller will activate the
hot spare and rebuild logical drive information and data to it.
•
If there is no hot spare drive available, the controller will begin rebuilding the
disk drive that failed.