The dual controllers of Huawei OceanStor hybrid flash storage are faulty, and the serial port of the controller cannot be started. The serial port of the controller prints "Grub err xxx." (Usually 24 or 17); after waiting for a long time, it still cannot be automatically repaired.
For this controller failure, which of the following description is correct? (Multiple Choice)

Huawei's hybrid flash storage system supports the integration of high-end storage technologies such as dynamic tiered storage, quality of service management, cache partitioning, hard disk balance, heterogeneous storage virtualization, and multiple data protection.

Which of the following types of LUNs can the SmartErase feature be applied to?

The fault recovery of Huawei's active and standby disaster recovery solution means that when the production site fails, the production business is automatically switched to the disaster recovery site for operation.

Minicomputer migration service, which layers does Huawei mainly support?(Multiple Choice)