Raid(Engineering > Computer Science And Engineering > Dbms Questions And Answers ) Questions and Answers
Question 1. Which level of RAID refers to disk mirroring with block striping?
RAID level 1
RAID level 2
RAID level 0
RAID level 3
Explanation:-
Answer: Option A. -> RAID level 1
RAID level 1RAID level 1 refers to disk mirroring with block striping.
Question 2. With multiple disks, we can improve the transfer rate as well by ___________ data across multiple disks.
Striping
Dividing
Mirroring
Dividing
Explanation:-
Answer: Option A. -> Striping
StripingData striping consists of splitting the bits of each byte across multiple disks; such striping is called bitlevel striping.
Question 3. Optical disk technology uses
Helical scanning
DAT
a laser beam
RAID
Explanation:-
Answer: Option D. -> RAID
RAIDRedundant Array of Inexpensive Disks.
Question 4. The RAID level which mirroring is done along with stripping is
RAID 1+0
RAID 0
RAID 2
Both a and b
Explanation:-
Answer: Option D. -> Both a and b
Both a and bMirroring without striping can also be used with arrays of disks, to give the appearance of a single large, reliable disk.
Question 5. Which one of the following is a Stripping technique ?
Byte level stripping
Raid level stripping
Disk level stripping
Block level stripping
Explanation:-
Answer: Option D. -> Block level stripping
Block level strippingBlock-level striping stripes blocks across multiple disks. It treats the array of disks as a single large disk, and it gives blocks logical numbers.
Question 6. Where performance and reliability are both important, RAID level ____ is used.
0
1
2
0+1
Explanation:-
Answer: Option D. -> 0+1
0+1Mirroring without striping can also be used with arrays of disks, to give the appearance of a single large, reliable disk.
Question 7. ______________ partitiones data and parity among all N+1 disks, instead of storing data in N-disks and parity in one disk.
Block interleaved parity
Block interleaved distributed parity
Explanation:-
Answer: Option B. -> Block interleaved distributed parity
Block interleaved distributed parityIn level 5, all disks can participate in satisfying read requests, unlike RAID level 4, where the parity disk cannot participate, so level 5 increases the total number of requests that can be met in a given amount of time.
Question 8. Hardware RAID implementations permit _________; that is, faulty disks can be removed and replaced by new ones without turning power off.
Scrapping
Swapping
Hot swapping
None of the mentioned
Explanation:-
Answer: Option C. -> Hot swapping
Hot swapping reduces the mean time to repair, since replacement of a disk does not have to wait until a time when the system can be shut down.
Question 9. ______________ which increases the number of I/O operations needed to write a single logical block, pays a significant time penalty in terms of write performance.
RAID level 1
RAID level 2
RAID level 5
RAID level 3
Explanation:-
Answer: Option C. -> RAID level 5
In level 5, all disks can participate in satisfying read requests, unlike RAID level 4, where the parity disk cannot participate, so level 5 increases the total number of requests that can be met in a given amount of time.
Question 10. ___________ is popular for applications such as storage of log files in a database system, since it offers the best write performance.
RAID level 1
RAID level 2
RAID level 0
RAID level 3
Explanation:-
Answer: Option A. -> RAID level 1
RAID level 1 refers to disk mirroring with block striping.