220-801 Question #132: Real Exam Question with Answer & Explanation

The correct answer is C: 3. RAID 5 uses block-level striping with distributed parity. Parity information is spread across all drives rather than dedicated to one drive. To calculate parity and distribute it meaningfully across the array, RAID 5 requires a minimum of 3 drives. With 3 drives, 2 drives hold da

Question

RAID 5 requires a minimum of how many hard drives?

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Explanation

RAID 5 uses block-level striping with distributed parity. Parity information is spread across all drives rather than dedicated to one drive. To calculate parity and distribute it meaningfully across the array, RAID 5 requires a minimum of 3 drives. With 3 drives, 2 drives hold data stripes and 1 drive's worth of space is used for parity (spread across all three). This allows recovery if any single drive fails. RAID 1 requires 2 drives; RAID 6 and RAID 10 require 4 drives minimum.

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