In Huawei OceanStor disaster recovery solutions, which is the major difference between synchronous remote replication and asynchronous remote replication?

Regarding the split of remote replication, which of the following statements is correct?

Which of the following is not a NAS protocol?

Huawei distributed storage can provide a big data storage platform based on the characteristics of big data, using Scale-out architecture and using general-purpose server hardware.

In the HyperMetro active-active data center solution, data centers A and B are deployed.
If the storage array in data center A fails, which of the following statemen& are true? (Multiple Choice)