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?
  1.    RAID level 1
  2.    RAID level 2
  3.    RAID level 0
  4.    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.
  1.    Striping
  2.    Dividing
  3.    Mirroring
  4.    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
  1.    Helical scanning
  2.    DAT
  3.    a laser beam
  4.    RAID
Explanation:-
Answer: Option D. -> RAID


RAIDRedundant Array of Inexpensive Disks.



Question 4. The RAID level which mirroring is done along with stripping is
  1.    RAID 1+0
  2.    RAID 0
  3.    RAID 2
  4.    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 ?
  1.    Byte level stripping
  2.    Raid level stripping
  3.    Disk level stripping
  4.    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.
  1.    0
  2.    1
  3.    2
  4.    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.
  1.    Block interleaved parity
  2.    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.
  1.    Scrapping
  2.    Swapping
  3.    Hot swapping
  4.    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.
  1.    RAID level 1
  2.    RAID level 2
  3.    RAID level 5
  4.    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.
  1.    RAID level 1
  2.    RAID level 2
  3.    RAID level 0
  4.    RAID level 3
Explanation:-
Answer: Option A. -> RAID level 1


RAID level 1 refers to disk mirroring with block striping.