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Q43 Multiple choice

Object Storage Service (OBS) uses distributed data fault tolerance technology known as Erasure Code (EC) to ensure high data reliability and data security.

Which of the following descriptions of EC technology are incorrect? (Choose two)

Select all that apply.

A
Data is redundantly sharded, and the sharded data is stored on different servers. If the number of faults is less than the number of redundant shards, the service operation is not affected.
B
Compared with the three-copy mechanism, the EC algorithm greatly improves storage utilization.
C
EC mainly aims to improve utilization; however, when a disk fails, the data reconstruction speed is
similar to that of traditional RAID.
D
The M+N redundancy mode of EC is equivalent to RAID 5 technology.

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