Advanced Operating System Questions and Answers on “RAID Structure”.
1. 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
Clarification: None.
2. 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
Clarification: None.
3. 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
Clarification: None.
4. The solution to the problem of reliability is the introduction of __________
a) aging
b) scheduling
c) redundancy
d) disks
Answer: c
Clarification: None.
5. The technique of duplicating every disk is known as ____________
a) mirroring
b) shadowing
c) redundancy
d) all of the mentioned
Answer: a
Clarification: None.
6. 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
Clarification: None.
7. 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
Clarification: None.
8. RAID level _______ refers to disk mirroring.
a) 0
b) 1
c) 2
d) 3
Answer: b
Clarification: None.
9. RAID level ______ is also known as bit interleaved parity organisation.
a) 0
b) 1
c) 2
d) 3
Answer: d
Clarification: None.
10. 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
Clarification: None.
11. RAID level ______ is also known as memory style error correcting code(ECC) organization.
a) 1
b) 2
c) 3
d) 4
Answer: b
Clarification: None.
12. 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
Clarification: There is one mirror disk for every disk in level 1.