RAID Structure – 1 MCQ’s

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This set of Operating System Multiple Choice Questions & Answers (MCQs) focuses on “RAID Structure – 1″.

1. RAID level _____ is also known as block interleaved parity organisation and uses block level striping and keeps a parity block on a separate disk.
a) 1
b) 2
c) 3
d) 4

2. A performance problem with _________ is the expense of computing and writing parity.
a) non-parity based RAID levels
b) parity based RAID levels
c) all RAID levels
d) none of the mentioned

3. RAID level 3 supports a lower number of I/Os per second, because _______________
a) Every disk has to participate in every I/O request
b) Only one disk participates per I/O request
c) I/O cycle consumes a lot of CPU time
d) All of the mentioned

4. In RAID level 4, one block read, accesses __________
a) only one disk
b) all disks simultaneously
c) all disks sequentially
d) none of the mentioned

5. A write of a block has to access ____________
a) the disk on which the block is stored
b) parity disk
c) a parity block
d) all of the mentioned

6. RAID level ____ spreads parity and data among all N+1 disks rather than storing data in N disks and parity in 1.
a) 3
b) 4
c) 5
d) 6

7. The overall I/O rate in RAID level 4 is ____________
a) low
b) very low
c) high
d) none of the mentioned

8. RAID level 5 is also known as ____________
a) bit-interleaved parity organization
b) block-interleaved parity organization
c) block-interleaved distributed parity
d) memory-style ECC organization

9. The potential overuse of a single parity disk is avoided in RAID level _______
a) 3
b) 4
c) 5
d) all of the mentioned

10. If a disk fails in RAID level ___________ rebuilding lost data is easiest.
a) 1
b) 2
c) 3
d) 4

11. RAID level 0+1 is used because, RAID level 0 provides ______ whereas RAID level 1 provides ________
a) performance, redundancy
b) performance, reliability
c) redundancy, performance
d) none of the mentioned

12. Where performance and reliability are both important, RAID level ____ is used.
a) 0
b) 1
c) 2
d) 0+1

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