Match List I with List II. List ILabel RAID level A RAID level 2 B RAID level…
2023
Match List I with List II.
List I
Label | RAID level |
|---|---|
A | RAID level 2 |
B | RAID level 4 |
C | RAID level 5 |
D | RAID level 3 |
List II
Label | Parity scheme |
|---|---|
I | Bit-interleaved parity |
II | Block-interleaved distributed parity |
III | Error-correcting parity |
IV | Block-interleaved parity |
Choose the correct answer from the options given below:
Answer: B. A-III B-IV C-II D-I — ConceptRAID levels are distinguished by the unit of data striping, the placement of parity information, and the error-control mechanism. RAID 2 uses…
- A.
A-IV B-III C-I D-II
- B.
A-III B-IV C-II D-I
- C.
A-III B-I C-II D-IV
- D.
A-I B-III C-IV D-II
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Show answer & explanation
Correct answer: B
Concept
RAID levels are distinguished by the unit of data striping, the placement of parity information, and the error-control mechanism. RAID 2 uses Hamming-code error correction; RAID 3 uses bit- or byte-level striping with dedicated parity; RAID 4 uses block-level striping with dedicated parity; and RAID 5 distributes block-level parity across the disks.
Application
RAID level 2 therefore corresponds to error-correcting parity (III).
RAID level 4 corresponds to block-interleaved parity (IV).
RAID level 5 corresponds to block-interleaved distributed parity (II).
RAID level 3 corresponds to bit-interleaved parity (I).
Cross-check
RAID level | Data unit | Redundancy mechanism |
|---|---|---|
RAID 2 | Bit-level | Hamming-code error correction |
RAID 3 | Bit/byte-level | Dedicated parity |
RAID 4 | Block-level | Dedicated parity |
RAID 5 | Block-level | Distributed parity |
The parity placement separates RAID 4 from RAID 5; the striping unit separates RAID 3 from the block-level schemes; and Hamming-code error correction identifies RAID 2.
Result
The resulting mapping is A-III, B-IV, C-II, D-I.
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