70-246 Question #18: Real Exam Question with Answer & Explanation

The correct answer is B: 5. RAID 5 (Answer B) is Microsoft's recommended configuration for System Center Data Protection Manager (DPM) storage pools because it provides the best overall balance across four key factors: capacity (only one disk's worth of space is lost to parity, unlike RAID 1 or RAID 10 whic

Question

For a typical DPM deployment there is a recommended RAID configuration. This configuration provides an effective compromise between capacity, cost, reliability, and performance. What RAID configuration is this?

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Explanation

RAID 5 (Answer B) is Microsoft's recommended configuration for System Center Data Protection Manager (DPM) storage pools because it provides the best overall balance across four key factors: capacity (only one disk's worth of space is lost to parity, unlike RAID 1 or RAID 10 which sacrifice 50%), cost (fewer disks needed than mirrored configurations), reliability (can survive a single disk failure and continue operating), and performance (good sequential read speeds suitable for backup and restore workloads). RAID 0 (C) offers no fault tolerance. RAID 1 (A) is expensive and wastes capacity. RAID 10 (D) offers excellent performance and redundancy but at a high cost and with 50% storage overhead, making it disproportionate for typical DPM backup storage needs.

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