FusionStorage Block"Alarm"VBSFailed to load metadata", which of the following are possible causes?

In Huawei FusionSphere OpenStack, the nova-scheduler component can migrate virtual machine instances to new computing nodes, and dynamically adjust the load of each computing node.

(Multiple Choice) Which of the following components areFusionAccessRequired components for desktop cloud?

(Multiple choice) IfFusionComputevirtual machineAand virtual machineBRunning on different physical hosts, which device must be used in the communication process?

When using Rainbow to migrate virtual machines to HCS, which of the following operations are feasible? (many)