A company's applications and data have high security requirements. During the inspection, it was found that two NL-SAS hard disks were offline and the data was lost. In order to avoid this situation, it is necessary to complete the RAID configuration and require the utilization of the hard disk. To be greater than 60%, which of the following are eligible? (Multiple Choice)

Which of the following items can be replaced by CRU users?

Which of the following are not necessary for remote replication? (Multiple Choice)

An enterprise adopts cloud primary and backup data-level disaster recovery. During business planning, storage can be divided into two types of LUNs based on actual needs: protected LUNs and unprotected LUNs. VMs that need disaster recovery are created on the protected LUNs, and only configure array replication for protection LUNs to save the storage space requirements of the disaster recovery center.

Compare NAS storage and SAN storage in terms of principle, performance, cost, sharing, and application scenarios. Which of the following descriptions is correct? (Multiple choice)