Recognizing drive failure (hp smartdrive), Effects of a hard drive failure on logical drives – HP Smart Array P731m Controller User Manual
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Drive procedures 22
Recognizing drive failure (HP SmartDrive)
If any of the following occurs, the drive has failed:
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The drive status LED illuminates amber.
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When failed drives are located inside the server or storage system and the drive LEDs are not visible, the
Health LED on the front of the server or server blade illuminates. 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 when the system is restarted, as long as the controller detects at least
one functional drive.
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HP SSA lists all failed drives, and represents failed drives with a distinctive icon.
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HP Systems Insight Manager can detect failed drives remotely across a network. For more information
about Systems Insight Manager, see the documentation on the Insight Management DVD or on the HP
website
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The HP System Management Homepage (SMH) indicates that a drive has failed.
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On servers with Windows operating systems, the Event Notification Service posts an event to the server
IML and the Microsoft Windows system event log.
•
On servers with Linux operating systems, Linux agents log the event, create an IML entry, and update
/var/log/messages.
For more information about diagnosing drive problems, see HP ProLiant Gen8 Troubleshooting Guide,
Volume I: Troubleshooting.
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 on logical drives
When a drive fails, all logical drives that are in the same array are affected. Each logical drive in an array
might be using a different fault-tolerance method, so each logical drive can be affected differently.
•
RAID 0 configurations do not tolerate drive failure. If any physical drive in the array fails, all RAID 0
logical drives in the same array also fail.
•
RAID 10 configurations tolerate multiple drive failures if no failed drives are mirrored to one another.
•
RAID 5 configurations tolerate one drive failure.
•
RAID 50 configurations tolerate one failed drive in each parity group.
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RAID 6 configurations tolerate two failed drives at a given time.
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RAID 60 configurations tolerate two failed drives in each parity group.
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RAID 1 (ADM) and RAID 10 (ADM) configurations tolerate multiple drive failures if no more than two
drives, mirrored to one another, fail.