220-801 Question #823: Real Exam Question with Answer & Explanation

The correct answer is B: RAID 1. RAID 1 (disk mirroring) writes identical data simultaneously to two drives, providing complete redundancy. If one drive fails, the other contains a full copy of all data. It requires only two drives, making it the simplest and most cost-effective fault-tolerant RAID level. RAID 0

Question

A technician needs to configure a computer system for MAXIMUM safety of stored data while staying cost effective. Which of the following RAID levels should be used?

Options

ARAID 0
BRAID 1
CRAID 3
DRAID 5

Explanation

RAID 1 (disk mirroring) writes identical data simultaneously to two drives, providing complete redundancy. If one drive fails, the other contains a full copy of all data. It requires only two drives, making it the simplest and most cost-effective fault-tolerant RAID level. RAID 0 uses striping with no redundancy - a single drive failure means total data loss. RAID 3 and RAID 5 use parity-based protection across three or more drives, which offers better storage efficiency at scale but increases complexity and cost. For maximum data safety with minimum cost, RAID 1 is the best choice.

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