📝 Improvement of reliability via redundancy in RAID Structure

📖 From Operating System • 10. Mass Storage Structure • 12 questions available

Practice MCQs for Improvement of reliability via redundancy in RAID Structure. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-26

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📝 Sample Questions

Q1. What best describes the C‑SCAN disk scheduling algorithm?

🔹 A. It moves the arm to the physical last cylinder, then reverses direction servicing requests on the way back.

🔹 B. It moves the arm in one direction servicing all requests, then jumps to the start and continues in the same direction without servicing during the jump.

🔹 C. It services requests in both directions like the SCAN algorithm.

🔹 D. It randomly selects cylinders to service regardless of request order.

💡 Difficulty: easy | ✅ Correct: B

Q2. How does C‑LOOK differ from C‑SCAN in handling the end of the request queue?

🔹 A. C‑LOOK always moves to the physical last cylinder before reversing.

🔹 B. C‑LOOK only goes as far as the last request in the current direction before reversing.

🔹 C. C‑LOOK reverses direction immediately after each request is serviced.

🔹 D. C‑LOOK services requests out of order to minimize latency.

💡 Difficulty: medium | ✅ Correct: B

Q3. Assume the same queue and head position as the previous question. What is the total head movement distance for C‑SCAN (including the jump) compared with SCAN?

🔹 A. C‑SCAN = 350 cylinders, SCAN = 299 cylinders

🔹 B. C‑SCAN = 167 cylinders, SCAN = 299 cylinders

🔹 C. C‑SCAN = 300 cylinders, SCAN = 350 cylinders

🔹 D. C‑SCAN = 400 cylinders, SCAN = 320 cylinders

💡 Difficulty: hard | ✅ Correct: A

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🔗 Related Topics

📝 Magnetic disks 📝 Solid state disks 📝 Magnetic tapes 📝 Disk Structure 📝 Host attached storage

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