SK0-004 · Question #456
A technician has a server with ten hard drives in a RAID 6 configuration. Which of the following is the MAXIMUM number of drives that can fail in the array while maintaining data integrity?
The correct answer is B. 2. RAID 6 uses dual distributed parity, allowing the array to survive exactly two simultaneous drive failures while preserving data integrity.
Question
A technician has a server with ten hard drives in a RAID 6 configuration. Which of the following is the MAXIMUM number of drives that can fail in the array while maintaining data integrity?
Options
- A1
- B2
- C3
- D4
How the community answered
(60 responses)- A2% (1)
- B95% (57)
- D3% (2)
Why each option
RAID 6 uses dual distributed parity, allowing the array to survive exactly two simultaneous drive failures while preserving data integrity.
Tolerating only one failure describes RAID 5, which uses single distributed parity, not the dual-parity mechanism of RAID 6.
RAID 6 writes two independent parity blocks across the array, which means the system can reconstruct data even if any two drives fail at the same time. This dual-parity design distinguishes RAID 6 from RAID 5, which only tolerates one failure. With ten drives in the array, all data remains accessible as long as no more than two drives fail simultaneously.
No standard RAID level provides three-drive failure tolerance from a simple dual-parity configuration; RAID 6 is strictly limited to two.
Four-drive failure tolerance is not a capability of RAID 6 regardless of array size, as only two parity drives are written per stripe.
Concept tested: RAID 6 dual-parity fault tolerance
Source: https://learn.microsoft.com/en-us/windows-server/storage/storage-spaces/storage-spaces-fault-tolerance
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