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You want to create a RAID set with 8 disks. Which RAID technology incurs a 50% capacity penalty?
A. RAID 0
B. RAID 1
C. RAID 5
D. RAID 6
Correct Answer: B
Explanation/Reference:
Industry Standard Architecture – Student Guide 1 – Page 256
RAID 1 – Disk Mirroring
Disk mirroring uses two disk drives of identical size. Data is written twice, to two separate mirrored drives. Data is written to one drive and an exact copy is written on the second disk. If one drive fails, the mirrored drive ensures data is not lost and read-write operations continue to be served.
This fault-tolerant solution is considered expensive because it requires double the drive storage. Only 50% of the total disk space is available for data storage because all data must be duplicated.
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