DataDirect Networks S2A9550, User Manual

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Trouble Shooting
84
DataDirect Networks S2A 9550 User Guide
4.1.1.2 Fan Failure
A fan failure error message will be displayed on your console if the fan module fails. Follow
these steps to replace the module.
NOTE : The S2A should not be operated with any open slots for more than 15 minutes. Make sure
you have the replacement fan unit available before removing the failed fan unit.
1. If installed, remove the cover panel by removing the two thumbscrews.
2. Remove the two thumbscrew from the fan module
(Figure 4-70)
. Then slide the module out
of the bay.
3. Slide the new module into the bay. Make sure it is fully inserted. Install the two
thumbscrews to secure it.
4. Replace the cover panel if previously installed.
4.1.2 Recovering from Drive Failures
When a drive failure occurs on the S2A, the tier containing that drive will begin operating in
degraded mode. This means that the tier will continue to handle I/O commands from the host,
but there will be no redundancy to protect against additional drive failures on the same tier. If
another disk drive fails in the same tier before the first drive is rebuilt (to a replacement disk or
hot spare), the tier will go offline.
If one disk in a tier fails, the data or parity information on the failed disk will be reconstructed
from the parity disk and data disks of that tier. An entire channel may fail without data loss.
It is recommended that the S2A’s Automatic Disk Rebuild function to be enabled at all times
(
TIER AUTOREBUILD=ON
).
NOTE : If more than one disk is failed in a single tier, only the first disk to fail will be replaced by a
spare disk. Any disks which fail after the first in each tier will not be reconstructed using a hot spare.
Figure 4-70 Fan Module
Thumbscrew Thumbscrew