H19-435_V1.0 · Question #89
FusionCubeEC3+2 mode supports a maximum of several node failures
The correct answer is A. 2. FusionCube EC3+2 uses an erasure coding scheme where "3" represents data chunks and "2" represents parity chunks. Because the system has 2 parity chunks, it can sustain exactly 2 simultaneous node failures before data becomes unrecoverable - making A (2) correct. B (3) is…
Question
FusionCubeEC3+2 mode supports a maximum of several node failures
Options
- A2
- B3
- C4
- D1
How the community answered
(32 responses)- A88% (28)
- B6% (2)
- C3% (1)
- D3% (1)
Explanation
FusionCube EC3+2 uses an erasure coding scheme where "3" represents data chunks and "2" represents parity chunks. Because the system has 2 parity chunks, it can sustain exactly 2 simultaneous node failures before data becomes unrecoverable - making A (2) correct.
- B (3) is wrong: tolerating 3 failures would require a "3" in the parity position, such as an EC N+3 configuration.
- C (4) is wrong: 4-node fault tolerance would demand even more parity overhead than EC3+2 provides.
- D (1) is wrong: single-failure tolerance (like RAID-5) corresponds to a "+1" parity scheme, not "+2."
Memory tip: In any EC N+M scheme, the M value is the maximum tolerated failures. For EC3+2, just look at the number after the "+": +2 = 2 failures max.
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