HP StorageWorks 9100 - Extreme Data Storage System, User Manual, Page: 29 / 50

Is the fan LED amber?
Answers
Possible reasons Possible solutions
No (green) Functioning properly. No action required
Yes
Fan may not be inserted properly,
it may have a damaged connector,
or it may have failed.
• Be sure that the fan is
undamaged and is fully
seated.
• Contact an authorized service
provider for assistance.
Is the UID module System Status LED amber?
Answers
Possible reasons Possible solutions
No (green) Functioning properly. No action required
Yes
UID module may not be inserted
properly, it may have a damaged
connector, or it may have failed.
• Be sure that the UID module
is undamaged and is fully
seated.
• Contact an authorized service
provider for assistance.
Recognizing hard drive failure
In an HP enclosure, a steadily glowing fault LED indicates that a drive has failed.
Factors to consider before replacing hard drives
In systems that use external data storage, be sure that the server is the fi rst unit to be powered off and the
last to be powered back on.
Before replacing a degraded drive:
• Open HP SIM or similar management software utility and inspect each physical drive in the array
to con fi rm that no other drives have errors.
• Be sure that the array has a current, valid backup.
• Use replacement drives that have a capacity at least as great as that of the smallest drive in the
array. The controller immediately fails drives that have insuf fi cient capacity.
To minimize the likelihood of fatal system errors, take these precautions when removing failed drives:
• Do not remove a degraded drive if any other drive in the array is of fl ine (the online LED is off). In
this situation, no other drive in the array can be removed without data loss.
• Do not remove a second drive from an array until the
fi rst failed or missing drive has been
replaced and the rebuild process is complete. (The rebuild is complete when the Online LED on
the front of the drive stops blinking.)
Automatic data recovery (rebuild)
When you replace a hard drive in an array, the controller uses fault-tolerance information on the
remaining drives in the array to reconstruct the missing data (the data that was originally on the replaced
drive) and write it to the replacement drive. This process is called automatic data recovery, or rebuild. If
fault tolerance is compromised, this data cannot be reconstructed and is likely to be permanently lost.
Time required for a rebuild
• The time required for a rebuild varies considerably, depending on several factors:
• The priority that the rebuild is given over normal I/O operations
9100c Extreme Data Storage System user guide
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