Which of the following is correct about its principle and related concepts?

SmartVirtualization is an important value-added feature of Huawei OceanStor V3 storage system.

Which of the following is correct about its principle and related concepts? (multiple choice)
A . The local storage system does not occupy the local storage system when using LUNs in heterogeneous storage systems
B . For external LUNs, the local storage system can set value-added functions such as remote replication, snapshots, etc.
C . smart Virtualization uses multipathing software to connect heterogeneous storage in a multipath-redundant manner
D . smart Virtualization Dictate write data write efficiency is higher than the write-back efficiency

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Answer: B,C