Hi Narayan  A raid5 raidgroup allocates a parity drive for itself. for eg if you create a r5 raidgroup of 5 drives you would get usable space of 4 drives i.e. N-1. so whenever theirs a single drive fault the hot spare kicks in to rebuild the data on to the spare drive. hope this answers ur query
when raid5 disk array allocate all disks to spA,if one disk fail,how can manage the same capacity
recently i got a problem