Which RAID implementation stripes data and parity at block level across all the drives?
A.
RAID level 1
B.
RAID level 2
C.
RAID level 4
D.
RAID level 5
Explanation:
With RAID level 5 data are written in disk sector units to all drives. Parity is written to all drives also, which
ensures there is no single point of failure.
Incorrect Answers:
A: RAID Level 1 does not use a parity bit. It uses mirroring of drives.
B: RAID Level 2 does not use block level parity. It uses hamming code parity.
C: RAID level 4 uses byte-level parity.
Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, p. 1270