SK0-004 · Question #284
Which of the following RAID levels can withstand the simultaneous loss of two physical drives in an array?
The correct answer is D. RAID 10. RAID 10 mirrors data across drive pairs, allowing any one drive per mirrored pair to fail without data loss, making simultaneous two-drive failure survivable.
Question
Which of the following RAID levels can withstand the simultaneous loss of two physical drives in an array?
Options
- ARAID 0
- BRAID 3
- CRAID 5
- DRAID 10
How the community answered
(37 responses)- A8% (3)
- B14% (5)
- C3% (1)
- D76% (28)
Why each option
RAID 10 mirrors data across drive pairs, allowing any one drive per mirrored pair to fail without data loss, making simultaneous two-drive failure survivable.
RAID 0 uses only striping with no redundancy, so even a single drive failure results in complete data loss.
RAID 3 uses a single dedicated parity drive and can tolerate only one drive failure at a time.
RAID 5 distributes parity across drives and can tolerate only one simultaneous drive failure before data is lost.
RAID 10 combines mirroring (RAID 1) and striping (RAID 0) so that data is written to mirrored pairs. As long as both failed drives are not from the same mirrored pair, the array remains fully operational. This gives RAID 10 the ability to survive the simultaneous loss of two physical drives under that condition.
Concept tested: RAID 10 fault tolerance and drive failure survivability
Source: https://learn.microsoft.com/en-us/windows-server/storage/storage-spaces/storage-spaces-fault-tolerance
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