Discussion
Which of the following is TRUE about RAID 5 ?
Answer: B
The true statement is that RAID 5 distributes parity across all disks.
RAID 5 stripes data in blocks across the disks and, for each stripe, stores a parity block on one disk, rotating which disk holds the parity from stripe to stripe. Spreading parity removes the single parity-disk bottleneck of RAID 4, and the parity lets the array rebuild the contents of any one failed disk.
A dedicated parity disk is RAID 4 (and RAID 3), so option A describes the wrong level. RAID 5 tolerates exactly one disk failure, not zero, and it needs at least three disks, since each stripe needs at least two data blocks and one parity block.
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