You are troubleshooting a RAID 5 array that has failed. What is the minimum number of drives that must be replaced to restore the array?
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You are troubleshooting a RAID 5 array that has failed. What is the minimum number of drives that must be replaced to restore the array?
A) One
B) Two
C) Three
D) Four
Correct choice: BExplanation: RAID 5 uses parity data to allow for the reconstruction of data if one drive fails. However, if two or more drives fail, the array cannot be rebuilt and data will be lost. Therefore, at least two drives must be replaced in order to restore the RAID 5 array.
I want to understand RAID 5 deeper, if one drive fails, then it would be easy to restore, but if two fail, then has the RAID failed completely?
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Robert,
Yes, RAID 0 - 5, meaning 0, 1, 3, and 5, it gives you the ability to recover the from the failure of 1 drive. If 2 or more were to occur this would not be recoverable. e.g., RAID 5 with 3 disk...could recover from failure of 1 drive.....but even with RAID 5 with 31 disks. It would also only be recoverable if 1 disk were to fail. 2 disk failure here would be unrecoverable.
