220-801 · Question #214
When building a RAID 10 array, which of the following is the minimum number of drives that have to be installed?
The correct answer is C. 4. RAID 10 (also written RAID 1+0) combines mirroring (RAID 1) and striping (RAID 0). It requires at least 4 drives because you need a minimum of two mirrored pairs, each pair containing 2 drives. One pair is mirrored for redundancy, and data is striped across the pairs for…
Question
When building a RAID 10 array, which of the following is the minimum number of drives that have to be installed?
Options
- A2
- B3
- C4
- D5
How the community answered
(43 responses)- A2% (1)
- B2% (1)
- C88% (38)
- D7% (3)
Explanation
RAID 10 (also written RAID 1+0) combines mirroring (RAID 1) and striping (RAID 0). It requires at least 4 drives because you need a minimum of two mirrored pairs, each pair containing 2 drives. One pair is mirrored for redundancy, and data is striped across the pairs for performance. With fewer than 4 drives, you cannot satisfy both the mirroring and striping requirements simultaneously.
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