What step is a best practice in the deployment process of a VxRail Appliance with an External vCenter server?

During the activation of Internal SRS, the implementation engineer receives a message that the deployment has failed What is a possible cause?

What is the maximum number of VxRail 4.7.x Clusters you can create with three G Series nodes and five E Series nodes?

Which service determines the primary node after powering on the VxRail nodes during the deployment of a VxRail cluster?

You are performing a troubleshooting steps on a 4 node VxRail cluster. The cluster uses Erasure Coding for all VMs. When you attempt to put a node into maintenance modeusing the recommended vSAN data migration policy, the operation fails.
What could be done to successfully put the node into maintenance mode?