220-801 · Question #80
Which of the following RAID types uses a drive mirroring algorithm? (Select TWO).
The correct answer is B. RAID 1 E. RAID 10. RAID 1 is pure disk mirroring - identical data is written simultaneously to two drives, providing redundancy but no performance gain from striping. RAID 10 (also written RAID 1+0) combines mirroring (RAID 1) with striping (RAID 0): drives are first mirrored in pairs, then those…
Question
Options
- ARAID 0
- BRAID 1
- CRAID 5
- DRAID 6
- ERAID 10
How the community answered
(19 responses)- B84% (16)
- C5% (1)
- D11% (2)
Explanation
RAID 1 is pure disk mirroring - identical data is written simultaneously to two drives, providing redundancy but no performance gain from striping. RAID 10 (also written RAID 1+0) combines mirroring (RAID 1) with striping (RAID 0): drives are first mirrored in pairs, then those mirrored sets are striped together. Both RAID 1 and RAID 10 therefore rely on a mirroring algorithm. RAID 0 is striping only (no redundancy), RAID 5 uses distributed parity, and RAID 6 uses dual distributed parity - none of those involve mirroring.
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