These Operating System MCQ and Answers – RAID Structure are asked in various examinations including BCA, MCA, GATE, and other tests. The questions based on the below Operating System MCQ and Answers – RAID Structure test your basic knowledge of MCQs on the topic of Operating Systems and the level of comprehension and grasp that you hold.
Operating System MCQ and Answers – RAID Structure
1. The solution to the problem of reliability is the introduction of __________
a) aging
b) scheduling
c) redundancy
d) disks
Answer: c
2. The technique of duplicating every disk is known as ____________
a) mirroring
b) shadowing
c) redundancy
d) all of the mentioned
Answer: a
3. The mean time to failure of a mirrored disk depends on ____________
I) the mean time to failure of individual disks
II) the mean time to repair
a) Only I
b) Only II
c) Both I and II
d) Neither I nor II
Answer: c
4. 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
Answer: a
5. 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
Answer: d
6. 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
Answer: b
7. 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
Answer: a
8. The overall I/O rate in RAID level 4 is ____________
a) low
b) very low
c) high
d) none of the mentioned
Answer: c
9. 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
Answer: d
10. 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
Answer: c
11. 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
Answer: c
12. The potential overuse of a single parity disk is avoided in RAID level _______
a) 3
b) 4
c) 5
d) all of the mentioned
Answer: c
13. 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
Answer: b
14. If a disk fails in RAID level ___________ rebuilding lost data is easiest.
a) 1
b) 2
c) 3
d) 4
Answer: a
15. Where performance and reliability are both important, RAID level ____ is used.
a) 0
b) 1
c) 2
d) 0+1
Answer: d
16. A large number of disks in a system improves the rate at which data can be read or written if ____________
a) the disks are operated on sequentially
b) the disks are operated on selectively
c) the disks are operated in parallel
d) all of the mentioned
Answer: c
17. RAID stands for ____________
a) Redundant Allocation of Inexpensive Disks
b) Redundant Array of Important Disks
c) Redundant Allocation of Independent Disks
d) Redundant Array of Independent Disks
Answer: d
18. If the mean time to failure of a single disk is 100,000 hours, then the mean time to failure of some disk in an array of 100 disks will be ____________
a) 100 hours
b) 10 days
c) 10 hours
d) 1000 hours
Answer: d
19. RAID level ________ refers to disk arrays with striping at the level of blocks, but without any redundancy.
a) 0
b) 1
c) 2
d) 3
Answer: a
20. RAID level _______ refers to disk mirroring.
a) 0
b) 1
c) 2
d) 3
Answer: b
21. RAID level ______ is also known as bit interleaved parity organisation.
a) 0
b) 1
c) 2
d) 3
Answer: d
22. A single parity bit can be used for ____________
a) detection
b) multiple error corrections
c) few error corrections
d) all of the mentioned
Answer: a
23. RAID level ______ is also known as memory style error correcting code(ECC) organization.
a) 1
b) 2
c) 3
d) 4
Answer: b
24. RAID level 3 does not have _________ as in RAID level 1.
a) efficiency
b) enough storage space for data
c) storage overhead
d) time consumption overhead
Answer: c