The maintenance personnel found that the storage fault indicator was on, and after logging in to the management interface, they found that the RALD group degraded alarm, and directly located the fault of a certain hard disk. Troubleshoot by replacing the hard drive. During this process, which of the following basic troubleshooting methods did the maintainer use?

The asynchronous remote replication of Huawei OceanStor storage system adopts multi-time slice caching technology, which can make the RPO index of LUN asynchronous remote replication reach the second level.

The Huawei Oceanstor Dorado high-end system is expanded through a 2-port 100G RDMA shared module. Which of the following is the maximum number of controllers that can be expanded?

Huawei OceanStor 9000 provides a single file system externally, which is managed through a unified file system namespace.
Which of the following descriptions about namespaces are correct? (Multiple Choice)

The virtualization data in the storage pool consists of two parts: the metadata volume and the data volume. Which of the following is not included in the metadata volume?