SG0-001 · Question #27
How many disks are required to create RAID 3 utilizing five data drives with a hot spare?
The correct answer is C. 7. To create a RAID 3 array with five data drives and a hot spare, a total of seven disks are required. RAID 3 requires one dedicated parity drive in addition to the data drives and the hot spare.
Question
How many disks are required to create RAID 3 utilizing five data drives with a hot spare?
Options
- A5
- B6
- C7
- D10
How the community answered
(61 responses)- A2% (1)
- B3% (2)
- C89% (54)
- D7% (4)
Why each option
To create a RAID 3 array with five data drives and a hot spare, a total of seven disks are required. RAID 3 requires one dedicated parity drive in addition to the data drives and the hot spare.
5 disks would only accommodate the data drives, leaving no room for parity or a hot spare in a RAID 3 configuration.
6 disks would allow for five data drives and one parity drive, but would not include a hot spare.
RAID 3 requires one dedicated parity drive for fault tolerance, meaning 5 data drives + 1 parity drive = 6 drives for the array. Adding one hot spare to this configuration brings the total number of disks required to 6 + 1 = 7 disks.
10 disks is significantly more than needed for five data drives, one parity drive, and one hot spare.
Concept tested: RAID 3 disk requirements (data, parity, hot spare)
Source: https://www.ibm.com/docs/en/aix/7.2?topic=concepts-raid-levels
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