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Which of the following has incorrect RAID level mappings?

Which of the following has incorrect RAID level mappings?

i.0 – Data striped over several drives. No redundancy or parity is involved
ii. 1 – Mirroring of drives
iii. 2 – Data striping over all drives at the bit level.
iv. 3 – Data striping over all drives and parity data held on one drive

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A.
None of them

B.
All of them

C.
iii

D.
iv

Explanation:
RAID 0 – Data striped over several drives. No redundancy or parity is involved.
RAID 1 – Mirroring of drives. Data are written to two drives at once.
RAID 2 – Data striping over all drives at the bit level.
RAID 3 – Data striping over all drives and parity data held on one drive.

One Comment on “Which of the following has incorrect RAID level mappings?

  1. Gummbah says:

    None of the answers are correct. The correct answer is ‘iii, iv’, but it’s not in the list of possible answers. Data striping does not take place over ALL drives in case of RAID 2 and RAID 3. One or more drives are used for parity codes only. Even ‘iv’ is wrong. This answers tells us that there is a parity drive in case of RAID 3. This is correct. As a consequence, striping cannot take place over ALL drives.




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