What is Spare Count and how does it work on the DSN-3200 Series San?

The spare count default is 0, meaning that no drives are reserved. If the spare count was 1 in an enclosure with 12 drives installed, 11 drives could be used by the XStack Storage unit for automatic volume creation and one drive would remain in the available pool. As volumes are created, drives would be moved from the available pool into the pool in which the volume is created, up to 11 drives. Should any of those drives fail, the 12th drive would become available to be used in any rebuild task that requires a drive.