Recognizing hard drive failure, Effects of a hard drive failure, Compromised fault tolerance – HP D2200sb Storage Blade User Manual
Page 28
Troubleshooting 28
Answer
Possible reasons
Possible solutions
LED ("
" on page
) indicates
normal temperature.
The hard drive drawer was open too long and
triggered critical overtemperature alerts.
Restart the partner server blade.
Recognizing hard drive failure
A steadily illuminated Fault LED on a hard drive indicates that the drive has failed.
Other indications of failed hard drives:
•
ACU represents failed drives with a distinctive icon.
•
HP SIM can detect failed drives remotely across a network. (For more information about HP SIM, refer
to the documentation on the Management CD.)
•
ADU lists all failed drives.
•
CPQONLIN identifies failed drives in a NetWare environment.
For additional information about diagnosing hard drive problems, see the HP ProLiant Servers
Troubleshooting Guide.
CAUTION:
Sometimes, a drive that has previously failed 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.
•
RAID 5 configurations can tolerate one drive failure.
•
RAID 6 configurations can tolerate simultaneous failure of two drives.
Compromised fault tolerance
CAUTION:
When fault tolerance is compromised, data loss can occur. However, it may be
possible to recover the data. For more information, see "Recovering from compromised fault
)."
If more drives fail than the fault-tolerance method can manage, fault tolerance is compromised, and the
logical drive fails. If this failure occurs, the operating system rejects all requests and indicates unrecoverable
errors.