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SG0-001 · Question #323
SG0-001 Question #323: Real Exam Question with Answer & Explanation
The correct answer is C. 5. For three hard drives, RAID 5 offers both fault tolerance through parity and the maximum usable capacity among the given options, losing only one drive's worth of space for parity data.
Storage Functionality
Question
Given three hard drives, which of the following RAID levels would provide fault tolerance and the MAXIMUM amount of capacity?
Options
- A0
- B1
- C5
- D1+0
Explanation
For three hard drives, RAID 5 offers both fault tolerance through parity and the maximum usable capacity among the given options, losing only one drive's worth of space for parity data.
Common mistakes.
- A. RAID 0 concatenates drives to provide maximum capacity (100% of raw capacity) and performance, but it offers no fault tolerance; if any drive fails, all data is lost.
- B. RAID 1 (mirroring) requires a minimum of two drives. With three drives, it would typically mirror one drive to another, offering fault tolerance but only using 50% of the total raw capacity, or could create multiple RAID 1 arrays, which does not fit the criterion of maximum capacity for a single fault-tolerant volume.
- D. RAID 1+0 (or RAID 10) requires a minimum of four drives to combine mirroring and striping, making it impossible to implement with only three drives.
Concept tested. RAID levels, fault tolerance, and capacity utilization
Reference. https://learn.microsoft.com/en-us/windows-server/storage/disk-management/understanding-raid
Topics
#RAID levels#fault tolerance#storage capacity
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