Before restriping, Huawei OceanStor 9000 determines whether the used space of the node pool in the target tier reaches the read-only watermark. Restriping is implemented only when the used space is lower than read-only watermark.

The disaster recovery feature of a storage product has an RPO of 30 minutes and an RTO of 15 minutes. Which of the following statements is correct? (Multiple choice)

The object service provides a wealth of object resource (bucket or object) access permission control capabilities. Of which, ACLs can only be used to prohibit permissions and cannot grant permissions.

The OceanStor 9000 employs general-purpose x86 hardware to set up the scale-out NAS architecture. Relying on IB, 10GE, and PCIe networking, nodes deliver high concurrency and outstanding performance. Compared with the other two networks, the PCIe network has better scalability and is easier to manage.

The data capacity of site A is 2000GB, the data capacity of site B is 3000GB, and the data of site B is remotely copied to site A for storage, then the back-end storage capacity required by site A is (re-deletion ratio is 3):