HP Smart Array P600-Controller - Manual (Page 29)

Replacing, moving, or adding hard drives 29
Recognizing hard drive failure
A steadily glowing Fault LED indicates that that drive has failed. Other means by
which hard drive failure is revealed are:
• The amber LED on the front of a storage system illuminates if failed drives
are inside. (However, this LED also illuminates when other problems occur,
such as when a fan fails, a redundant power supply fails, or the system
overheats.)
• A POST message lists failed drives whenever the system is restarted, as long
as the controller detects at least one functional drive.
• ACU represents failed drives with a distinctive icon.
• Systems Insight Manager can detect failed drives remotely across a network.
(For more information about Systems Insight Manager, refer to the
documentation on the Management CD.)
• ADU lists all failed drives.
For additional information about diagnosing hard drive problems, refer to the HP
Servers Troubleshooting Guide.
CAUTION: Sometimes, a drive that has previously been failed by
the controller may seem to be operational after the system is power-
cycled or (for a hot-pluggable drive) after the drive has been removed
and reinserted. However, continued use of such marginal drives may
eventually result in data loss. Replace the marginal drive as soon as
possible.
Effects of a hard drive failure
When a hard drive fails, all logical drives that are in the same array are affected.
Each logical drive in an array may be using a different fault-tolerance method, so
each logical drive can be affected differently.
• RAID 0 configurations cannot tolerate drive failure. If any physical drive in
the array fails, all non-fault-tolerant (RAID 0) logical drives in the same
array will also fail.
• RAID 1+0 configurations can tolerate multiple drive failures as long as no
failed drives are mirrored to one another.