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14.2.7 Managing a Hot Spare of a Hardware RAID Volume


14.2.7 Managing a Hot Spare of a Hardware RAID Volume
With a hot spare drive already created, if one of the disk drives of a mirrored RAID volume (RAID1, RAID10, or RAID1E) fails, the on-board RAID controller replaces the failed disk drive with the hot spare drive and resynchronizes data.

Use the SAS2IRCU utility to create or delete a hot spare of a RAID volume. For details on the SAS2IRCU utility, see the beginning of "14.2 Configuring Hardware RAID." Also, for examples of the sas2ircu command, see "Appendix F SAS2IRCU Utility Command Examples."
Note - If you configure two RAID volumes with different disk drive capacities, we do not recommend creating a hot spare for the following reasons.
- When the disk drive capacity of a hot spare is smaller than the disk drive configuring the RAID volume
Re-synchronization is not executed because the hot spare drive cannot replace the failed disk drive.

- When the disk drive capacity of a hot spare is larger than the disk drive configuring the RAID volume
The hot spare drive replaces the failed disk drive and re-synchronization is executed. However, the RAID disk volume is configured with a different disk drive capacity. (This configuration is not supported.)