In RAID2.0+ technology, what is the default size in MB of the CHUNK segmented from SAS hard disks?

Intra-city disaster recovery can adopt synchronous remote replication, and Fibre Channel links are recommended. Remote disaster recovery can adopt asynchronous remote replication, and IP links are recommended for cost reduction.

HyperMetro guarantees real-time data synchronization between the storage arrays of the two sites through the real-time data mirroring function across sites. The data center array needs to record the write log when it receives the write I/O. Only the address information is recorded in the log, and the specific write data content is not recorded. The log is recorded in the memory space with power-down protection capability to obtain good performance.

In the Huawei Oceanstor 9000 system, the file pool refers to a collection of files that meet certain characteristics. The file pool policy defines the rules for how the file pool is stored in the node pool.

In the Huawei disaster recovery solution, which description is correct about the sequence of synchronous remote replication?