Regarding the steps of SAN synchronous replication, which of the following is in the correct order?

Regarding the steps of SAN synchronous replication, which of the following is in the correct order?

(1) The production storage receives the host write request. Hyper Replication logs the request. Only the address information is recorded in the log, and the data content is not recorded.

(2) Hyper Replication waits for the write processing results of the primary LUN and the secondary LUN to return. If all writes are successful, clear the log; otherwise, keep the log and enter the abnormal disconnection state, and then re-copy the data block corresponding to the log address when synchronization is started.

(3) Write the request to the primary LUN and secondary LUN. Normally, the LUN is in the write-back state, and data is written to the Cache.

(4) Return the processing result of the host write request, subject to the processing result of the write master LUN.
A . （ 1 ）（ 3 ）（ 2 ）（ 4 ）
B. （ 1 ）（ 2 ）（ 3 ）（ 4 ）
C. （ 2 ）（ 1 ）（ 3 ）（ 4 ）
D. （ 4 ）（ 2 ）（ 3 ）（ 1 ）

View Answer

Answer: A