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NOTE :
If more than one disk is failed in a single tier, only the first disk to fail will be replaced by the
spare disk. Any disks which fail after the first in each tier will not be reconstructed using a
hot spare.
4.2.2.1 Single Drive Failures
A single drive failure in any tier does not result in the data loss. The LUN(s) on that tier will continue
to operate in degraded mode. If a spare drive is available, the controller will automatically rebuild the
data on the spare drive if “autorebuild” is enabled. System operation is not affected while recovery is
taking place.
When a drive failure occurs, the controller displays an error message on your console, indicating which
drive has failed and which spare drive (if available) is replacing the failed drive. If your drive enclosure
is on the SGI official controller compatibility list, the Fault LED on the failed drive will turn amber.
The error is also written to the event log. The controller will rebuild the drive automatically once it finds
a suitable spare drive. You may monitor the rebuild progress or change the rebuild rate to match the user
load. To obtain additional information, use the TIER or LOG command.
TIER displays the status of the disks. The failed drive is denoted by an “r” .
If a Rebuild is taking place, the percentage of completion is also displayed. Figure 4–6 illustrates a
system that has a failed drive on Tier 2, Channel D and it is being rebuilt.