A distributed storage system divides data into N blocks (N is even) and uses an EC coding algorithm to calculate a check block. Which values are possible for the number of check bl... A distributed storage system divides data into N blocks (N is even) and uses an EC coding algorithm to calculate a check block. Which values are possible for the number of check blocks, M?
Understand the Problem
The question is asking about the properties of error correction (EC) coding in distributed storage systems. Specifically, it asks, given the number of data blocks (N is even), what values are possible for the number of check blocks (M) generated by the EC coding algorithm. The possible answers provided are 1, 2, 3, and 4.
Answer
The number of check blocks, M, can vary based on the EC scheme used, but is usually smaller than N.
In a distributed storage system that divides data into N blocks (where N is even) and uses an Erasure Coding (EC) algorithm, the number of check blocks, M, can vary depending on the specific EC scheme used. Common configurations often involve a relatively small number of check blocks compared to the number of data blocks, but the exact values depend on the desired level of redundancy and fault tolerance.
Answer for screen readers
In a distributed storage system that divides data into N blocks (where N is even) and uses an Erasure Coding (EC) algorithm, the number of check blocks, M, can vary depending on the specific EC scheme used. Common configurations often involve a relatively small number of check blocks compared to the number of data blocks, but the exact values depend on the desired level of redundancy and fault tolerance.
More Information
Erasure coding is a method of data protection in which data is broken into fragments, expanded and encoded with redundant data pieces. This protects the data against loss or corruption. The number of check blocks (M) determines the level of redundancy.
Tips
The number of check blocks is usually less than the number of data blocks. It may be a fixed number or a ratio.
Sources
- Block Service - OceanStor Pacific Series 8.1.0 Product Description 07 - support.huawei.com
- Erasure coding and how is it different from RAID? - TechTarget - techtarget.com
- Erasure Code Subsystem - CubeFS - cubefs.io
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