Raid 6 would mean you'd have to lose at least two drives to be wiped out.
Raid 6 with hot spare means you'd have to lose at least three drives,
Kind of like, which is better:
Raid 5 with a hot spare, or
Raid 6 with no hot spare
Either way, you'd have to lose two drives to be fried. I would think that
Raid 6 would be better if there was a risk the second drive would be lost
while the hot spare for raid 5 was becoming active and still rebuilding.
With Raid 5 you lose the space of one drive to striping (spread out across
all drives). How much do you lose to Raid 6?
Is there a performance degradation from removing one of your disk drives
of a 8 drive SCSI raid set to become hot spare?
I would think there would be two performance hits. One, dropping from 8
drives supporting the raid stripe down to only 4. The other performance
hit would be one less disk arm assisting while it's just sitting there
waiting to be hot spare.