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what is commonly known as server fault tolerance?

Which RAID level concept is considered more expensive and is applied to servers to create what is commonly
known as server fault tolerance?

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A.
RAID level 0

B.
RAID level 1

C.
RAID level 2

D.
RAID level 5

Explanation:
RAID level 1 is mirroring of drives. Data are written to two drives at once. 50% of the disks are used for fault
tolerance.
Incorrect Answers:
A: RAID level 0, data striping, provides no fault tolerance.
C: RAID Level 2 uses parity for fault tolerance, but is not used in production today.
D: RAID level 5 uses one parity bit for fault tolerance. With three drives, the minimum amount, 33% of the disks
are for fault tolerance.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, p. 1270


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