HP StorageWorks 9100c Extreme Data Storage System user guide (496784-001, November 2008)

Is the fan LED am
ber?
Answers
Possible reasons Possible solutions
No (green)
Functioning properly. No action required
Yes
Fan may not be i
nserted properly,
it may have a da
maged connector,
or it may have failed.
• Be sure that th
efan is
undamaged an
disfully
seated.
• Contact an au
thorized service
provider fo
rassistance.
Is the UID module System Status LED amber?
Answers
Possible reasons Possible solutions
No (green)
Functioning properly. No action required
Yes
UID modulemay notbeinserted
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.
Facto
rs to consider before replacing hard drives
In sys
tems that useexternaldatastorage,besurethatthe server is the first unit to be powered off and the
last to be powered back on.
Before replacing a degraded drive:
• Open H
P SIM or similar management software utility and inspect each physical drive in the array
to co
nfirm 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 insufficient capacity.
To m
inimize the likelihood of fatal system errors, take these precautions when removing failed drives:
• Do notremoveadegraded driveifany otherdriveinthe arrayisoffline(theonlineLED is off). In
this situation, no other drive in the array can be removed without data loss.
• Do n
ot remove a second drive from an array until the first failed or missing drive has been
replaced and the rebuild process is complete. (The rebuild is complete when the Online LED on
thefront of thedrivestops 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
• T
he time required for a rebuild varies considerably, depending on several factors:
• The priority that the rebuild is given over normal I/O operations
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