ITPEC FE Morning April 2019 Question 13
ITPEC FE Morning April 2019 — Question 13 of 80
RAID 5 — block-level striping with distributed parity.
RAID 5 distributes data in blocks across multiple drives and spreads parity across all drives (no dedicated parity disk).
Why not others:
- (a) — describes RAID 2: bit-level striping with ECC
- (c) — describes RAID 3/4: byte-level striping with a single dedicated parity drive
- (d) — describes RAID 1: mirroring (same data on two drives)
Quick RAID cheat sheet:
- RAID 0 — striping, no redundancy
- RAID 1 — mirroring
- RAID 2 — bit-level + ECC
- RAID 3/4 — byte/block-level + dedicated parity disk
- RAID 5 — block-level + distributed parity
- RAID 6 — like RAID 5 but with double parity (tolerates 2 disk failures)
Key distinction: RAID 5 vs RAID 3/4 — parity is distributed (RAID 5) vs dedicated to one disk (RAID 3/4).
AI-generated — may contain errors
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