HP SB40c-Storage-Blade - Manual (Page 22)

Troubleshooting 22
Answer Possible reasons Possible solutions
• Insufficient power is available to operate
the SB40c.
• Remove any unused server blades, SB40cs, or
interconnect devices.
• Verify that the enclosure has sufficient power
supply capacity available to operate all
installed devices.
• Verify that the enclosure power settings will
enable the SB40c to start.
• Add power supplies to meet the power
requirement.
• Insufficient or improperly located
enclosure cooling fans.
• Verify that a sufficient number of cooling fans
are in the enclosure.
• Verify that the cooling fans are properly
configured for the devices installed in the
enclosure.
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.