HPE0-V25 · Question #101
Drag and Drop Question Match the RAID level to the number of drive failures an array can handle without losing data. Each option may be used once, more than once, or not at all. Answer:
The correct answer is Any single drive in the same party group; Any two drives in the same party group; No drive can fail; Any single drive in the same party group. RAID Fault Tolerance - Explanation Note: The RAID level labels for positions 1–4 are missing from your question. Based on the correct answers, the most likely mapping is: | Position | RAID Level | Answer | |----------|------------|--------| | 1 | RAID 5 | Any single drive in…
Question
Drag and Drop Question Match the RAID level to the number of drive failures an array can handle without losing data. Each option may be used once, more than once, or not at all. Answer:
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Answer Area
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Correct arrangement
- Any single drive in the same party group
- Any two drives in the same party group
- No drive can fail
- Any single drive in the same party group
Explanation
RAID Fault Tolerance - Explanation
Note: The RAID level labels for positions 1–4 are missing from your question. Based on the correct answers, the most likely mapping is:
| Position | RAID Level | Answer |
|---|---|---|
| 1 | RAID 5 | Any single drive in the same parity group |
| 2 | RAID 6 | Any two drives in the same parity group |
| 3 | RAID 0 | No drive can fail |
| 4 | RAID 10 | Any single drive in the same parity group |
Position-by-Position Breakdown
Position 1 - RAID 5 → "Any single drive in the same parity group" RAID 5 uses distributed parity across all drives. If one drive fails, the array reconstructs the missing data using parity data spread across the remaining drives. Exactly one drive failure is tolerable.
Position 2 - RAID 6 → "Any two drives in the same parity group" RAID 6 adds a second independent parity block (dual parity). This means two simultaneous drive failures can be survived. RAID 6 was designed specifically for large arrays where the rebuild time after one failure leaves the array at risk of a second failure.
Position 3 - RAID 0 → "No drive can fail" RAID 0 is pure striping with zero redundancy. Data is split across drives with no parity and no mirroring. Losing any single drive destroys the entire array. More drives = higher failure risk overall.
Position 4 - RAID 10 → "Any single drive in the same parity group" RAID 10 (1+0) mirrors pairs of drives, then stripes across the pairs. Within each mirrored pair, one drive can fail safely. The phrase "same parity group" here refers to the mirrored pair - lose both drives in the same pair and data is lost, but losing one per pair is fine.
Common Misconceptions
- RAID 0 isn't "bad" - it offers maximum performance and capacity, just no fault tolerance. It's chosen intentionally, not as a mistake.
- RAID 5 vs RAID 6 confusion: RAID 5 = one failure, RAID 6 = two failures. The extra "6 − 5 = 1" parity block is the giveaway.
- RAID 10 failure model is often misunderstood: You can lose up to N/2 drives if they're all from different mirrored pairs. But losing both drives from the same pair = data loss. Exam questions emphasize the worst-case per pair.
- "Parity group" ≠ "parity drive": In RAID 5/6, parity is distributed, not on one dedicated drive (that was RAID 4). Don't confuse the two.
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