Huawei Certified ICT Professional – Storage (HCIP-Storage) — Question 10

Compared with traditional RAID algorithms, the erasure code redundancy technology provides higher reliability and more flexible redundancy policies. Which of the following statements about the working principle of erasure code is false?

Answer options

• A. Data to be written is divided into N data blocks of the same size.
• B. The erasure code algorithm calculates M parity blocks for every N consecutive data blocks. (The value of N is smaller than that of M.)
• C. N+M data blocks are concurrently stored to different nodes.
• D. In erasure code storage mode, a concurrent failure of M-1 disks is tolerated at most.

Correct answer: B

Explanation

The correct answer is B because in erasure coding, M represents the number of parity blocks which must be greater than or equal to N for redundancy, meaning N must be less than or equal to M. Options A, C, and D accurately describe the principles of erasure coding and its capabilities regarding data block storage and fault tolerance.