I know this is a rudementary question, but should the volume go offline if a single disk fails in a RAID 5 set comprised of only 3 disks? I know the array can be rebuilt easily with the other 2 disks, but should the array go offline? I ask becuase I've been sold a few PE2650s with a split backplane.  OS is on a 2 disk mirrored set and data is on a 3 disk RAID 5 set.  If the RAID 5 sets would go offline due to a single disk failure this isn't a very fault tolerant design.  Just curious.

Thanks

-Sean