User manual

Chapter 5: Server Management
176 Cobalt RaQ XTR User Manual
If the RaQ XTR has been configured for RAID-0 and a hard disk drive fails, all
data is lost.
If the RaQ XTR has been configured for RAID-1 and a single hard disk drive
fails, the server can continue to operate. To restore the RAID-1 configuration
(disk mirroring), you must replace the failed hard disk drive and reboot the
RaQ XTR server.
If the RaQ XTR has been configured for RAID-5 and a single hard disk drive
fails, the RaQ XTR cannot operate. To restore the RAID-5 configuration (parity
striping), you must replace the failed hard disk drive and reboot the server.
In case of a failed hard disk drive, the replacement drive must be the same model
number by the same manufacturer as the failed hard disk drive, and it should have
the same storage capacity. If you cannot find a hard disk drive to match the failed
drive, you can use a replacement drive that has a larger storage capacity than the
failed drive.
See Appendix C, “Upgrading the RaQ XTR” for more information on replacing a
failed hard disk drive.
Once you replace a failed drive on a RaQ XTR and reboot the server, the system
detects the new hard disk drive and automatically begins to re-integrate it.
• For a RAID-1 configuration, the system synchronizes the new hard disk
drive to the existing drive to recreate a mirrored disk drive.
• For a RAID-5 configuration, the system recreates the failed hard disk drive
from the parity data available on the other hard disk drives.
✍
Note: You can remove the failed hard disk drive and insert a
replacement drive without powering down the RaQ XTR. However,
to re-establish RAID service, you must reboot the server so that the
system will integrate the replacement drive.
✍
Note: While the RaQ XTR server is re-integrating the new hard
disk drive, the server is not in a RAID configuration but it can still
serve requests.