ITPEC FE Morning October 2021 Question 15
ITPEC FE Morning October 2021 — Question 15 of 80
RAID 5 — block-level striping with distributed parity across all disks.
RAID 5 distributes both data blocks and parity information across all member disks, eliminating the bottleneck of a single dedicated parity disk.
RAID level comparison:
- RAID 0 — striping, no parity, no redundancy
- RAID 1 — mirroring (exact copy on two disks)
- RAID 3 — bit/byte-level striping + dedicated parity disk
- RAID 4 — block-level striping + dedicated parity disk
- RAID 5 — block-level striping + distributed parity
- RAID 6 — block-level striping + double distributed parity
Why not others:
- (a) Bit-level striping with a dedicated parity disk — describes RAID 3
- (b) Block-level striping with a dedicated parity disk — describes RAID 4
- (d) Byte-level striping with a dedicated parity disk — variant of RAID 3
Key rule: RAID 5 distributes parity across all disks; RAID 4 uses a single dedicated parity disk. Both use block-level striping.
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