System performance is affected during the rebuild, and the system is unprotected against further
drive failure until the rebuild has finished. Therefore, replace drives during periods of low activity
when possible.
CAUTION: If the Online LED of the replacement drive stops blinking and the amber fault LED
glows, or if other drive LEDs in the array go out, the replacement drive has failed and is producing
unrecoverable disk errors. Remove and replace the failed replacement drive.
When automatic data recovery has finished, the online LED of the replacement drive stops
blinking and begins to glow steadily.
Failure of another drive during rebuild
If a non-correctable read error occurs on another physical drive in the array during the rebuild
process, the Online LED of the replacement drive stops blinking and the rebuild abnormally
terminates. If this situation occurs, restart the server. The system might temporarily become
operational long enough to allow recovery of unsaved data. In any case, locate the faulty drive,
replace it, and restore data from backup.
Handling disk drive failures
If the controller was configured with hardware fault tolerance, complete the following steps after
a disk drive failure:
1. Determine which physical drive failed. On hot-plug drives, an amber drive failure LED
illuminates.
2. If the unit containing the failed drive does not support hot-plug drives, perform a normal
shutdown.
3. Remove the failed drive and replace it with a drive that is of the same capacity. For hot-plug
drives, after you secure the drive in the bay, the LEDs on the drive each flash once in an
alternating pattern to indicate a successful connection. The online LED flashes, indicating
that the controller recognized the drive replacement and began the recovery process.
4. Power on the server, if applicable.
5. The controller reconstructs the information on the new drive, based on information from the
remaining physical drives in the logical drive. While reconstructing the data on hot-plug
drives, the online LED flashes. When the drive rebuild is complete, the online LED is
illuminated.
54 Troubleshooting
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