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CompTIA Server+ · CompTIA
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Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
B - RAID 1
RAID 1 Disk Mirroring This RAID design provides a very high degree of redundancy. All content is written to both disks, and if one disk fails, the other disk has everything. This solution is excellent for mission-critical situations. The downside to mirroring is that drive space is not very efficiently used (if you buy two disks that are 1 TB each, you’ve paid for 2 TB of storage but will only have the effective capacity of 1 TB). RAID 1 requires a minimum of two disks. The Official CompTIA Server+ Study Guide (Exam SK0-005) page 114.
RAID 1 would be mirroring. RAID 0 striping and therefore no redundancy. RAIDs 5 & 6 require a minimum 3/4 disks so cannot be the answer here. https://www.prepressure.com/library/technology/raid