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46.
Which of the following provides no fault tolerance?
- A.RAID 0
- B.RAID 1
- C.RAID 5
- D.RAID 6
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| RAID 0, also known as disk striping, provides no fault tolerance. |
47.
Which of the following is also called disk mirroring?
- A.RAID 0
- B.RAID 1
- C.RAID 5
- D.RAID 6
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| RAID 1 is also known as disk mirroring. This is a method of producing fault tolerance by writing all data simultaneously to two separate drives. |
48.
If three 250 MB disks are present in a RAID 5 array, how much space is actually usable for data?
- A.125 MB
- B.200 MB
- C.250 MB
- D.500 MB
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| A minimum of three drives is required. RAID 5 uses 1/n (n = the number of drives in the array) for parity information (for example, one third of the space in a three-drive array), and only 1 – (1/n) is available for data. So if three 250 GB drives are used in the array (for a total of 750 GB), 500 GB will be the available drive space. |
49.
What is the minimum number of disk required for RAID 5?
- A.2
- B.3
- C.4
- D.5
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| A minimum of three drives is required. |
50.
RAID 6 writes parity information across the drives as is done in RAID 5, but it writes two
stripes. What is the effect of writing two stripes?
- A.Speeds performance
- B.Allows the cable to be longer
- C.Hurts performance
- D.Allows you to use only two drives
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| One disadvantage in using RAID 6 is that each set of parities must be calculated separately, which slows write performance. |
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