Question

Choose the correct answer from the options given below:
(A). RAID 3 requires only a single redundant disk.
(B) In RAID 4 scheme, two different parity calculations are carried out and stored in separate blocks on different disks.
(C) RAID 5 distributes the parity strips across all disks.
(D) In RAID 2, the number of redundant disks are proportional to the log of the number of data disks.

• A. (A) and(B) only.
• B. (B), (C) and (D) only.
• C. (A), (B) and (D) only.
• D. (A), (C) and (D) only.

Hint:

RAID 3 and 5 use parity, with RAID 5 distributing it across disks while RAID 3 uses a single parity disk. RAID 2 uses error correction codes that require a proportional number of redundant disks.

Answer 1

The Correct Option is D

RAID 3 requires a single redundant disk (Correct). In this RAID configuration, a single disk stores the parity information for the entire array. RAID 4 requires a dedicated parity disk, not multiple blocks or disks storing parity calculations (Incorrect). RAID 5 distributes the parity strips across all disks (Correct). RAID 5 uses striping with distributed parity, which avoids having a single parity disk. RAID 2 uses Hamming code for error correction, where the number of redundant disks is proportional to the log of the number of data disks (Correct). Thus, the correct answer is: (A), (C) and (D) only.