SK0-004 · Question #256
Which of the following BEST describes the difference between RAID 5 and RAID 6?
The correct answer is C. RAID 6 uses more parity drives than RAID 5. RAID 5 uses a single set of distributed parity while RAID 6 uses two sets, allowing RAID 6 to survive two simultaneous drive failures.
Question
Which of the following BEST describes the difference between RAID 5 and RAID 6?
Options
- ARAID 5 uses a dedicated parity drive and RAID 6 does not.
- BRAID 6 uses a dedicated parity drive and RAID 5 does not.
- CRAID 6 uses more parity drives than RAID 5.
- DRAID 5 uses more parity drives than RAID 6.
How the community answered
(36 responses)- A3% (1)
- B6% (2)
- C89% (32)
- D3% (1)
Why each option
RAID 5 uses a single set of distributed parity while RAID 6 uses two sets, allowing RAID 6 to survive two simultaneous drive failures.
Neither RAID 5 nor RAID 6 uses a dedicated parity drive - both distribute parity data across all member drives.
RAID 6 also does not use a dedicated parity drive; it distributes dual parity across all drives just as RAID 5 distributes single parity.
RAID 5 distributes one parity block across all drives, tolerating a single drive failure. RAID 6 distributes two independent parity blocks (using algorithms such as P+Q) across all drives, requiring a minimum of four drives and tolerating any two simultaneous drive failures. This dual parity is the key differentiator.
This reverses the correct relationship - RAID 6 uses more parity than RAID 5, not less.
Concept tested: RAID 5 vs RAID 6 parity block comparison
Source: https://learn.microsoft.com/en-us/windows-server/storage/storage-spaces/storage-spaces-fault-tolerance
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