A technician is dispatched to a business where it is discovered that two physical hard drives in a RAID 5 configuration have failed. Which of the following is the BEST solution?

The correct answer is B. Replace the two failed drives and restore from the latest backup. RAID 5 uses striping with distributed parity and can tolerate the failure of exactly one drive-the array rebuilds lost data using parity from the remaining drives. When two drives fail simultaneously, the parity data is insufficient to reconstruct the lost information, and the…

Hardware and network troubleshooting

Question

Options

AReplace the whole array; the other drives will soon fail.
BReplace the two failed drives and restore from the latest backup.
CReplace only one drive and restore from the latest backup.
DReplace one drive at a time and allow the RAID to rebuild.

How the community answered

(46 responses)

A
22% (10)
B
59% (27)
C
13% (6)
D
7% (3)

Explanation

RAID 5 uses striping with distributed parity and can tolerate the failure of exactly one drive-the array rebuilds lost data using parity from the remaining drives. When two drives fail simultaneously, the parity data is insufficient to reconstruct the lost information, and the array is completely offline with data loss. The only recovery path is to replace both failed drives, reinitialize the RAID array, and then restore all data from the most recent backup. Replacing only one drive or allowing the RAID to rebuild is not possible because the array cannot function or rebuild with two drive failures.

Topics

#RAID 5#dual drive failure#data recovery#backup restoration

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