220-801 Question #214: Real Exam Question with Answer & Explanation

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 performa

Question

When building a RAID 10 array, which of the following is the minimum number of drives that have to be installed?

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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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