What are the principles of making a file system backup strategy? (Multiple choice)

Huawei's hybrid flash storage supports the integration of NAS and SAN, and the software protocol stacks of the two are completely parallel, and they are integrated on the resource allocation and management plane.

Serial communication to the OceanStor V3 controller is configured at:

Huawei OceanStor 9000 uses the erasure code technology to protect data. A site has seven nodes, and the customer requires the disk utilization rate to reach 70%.
Which redundancy levels can be used to meet the requirement? (Multiple Choice)

In Huawei synchronous remote replication, the primary and secondary LUNs can reside in the same storage array.