Two sets of configuration of synchronous remote replication OceanStor unified storage, in order to improve the host write performance on the back-end storage, which of the following method is effective? (Multiple choice)

Two sets of configuration of synchronous remote replication OceanStor unified storage, in order to improve the host write performance on the back-end storage, which of the following method is effective? (Multiple choice)
A . in the scenario of RPO not require as zero, suggested the use of asynchronous remote copy program
B . In the back-end storage using SmartCache to accelerate, speed up the back-end storage IO processing speed
C . according to the back-end storage each LUN business pressure, and divide each LUN ownership of the controller to A controller and B controller
D . If you use asynchronous remote replication scheme, need to design enablement synchronization time according to RPO metrics, and try to consider the setting of enablement synchronization time during the business downturn

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Answer: ACD