If all nodes in a vCenter HA cluster cannot communicate with each other, the Active node stops serving client requests.

Problem

Node isolation is a network connectivity problem.

Solution

  1. Attempt to resolve the connectivity problem. If you can restore connectivity, isolated nodes rejoin the cluster automatically and the Active node starts serving client requests.
  2. If you cannot resolve the connectivity problem, you have to log in to Active node's console directly.
    1. Power off and delete the Passive node and the Witness node virtual machines.
    2. Log in to the Active node by using SSH or through the Virtual Machine Console.
    3. To enable the Bash shell, enter shell at the appliancesh prompt.
    4. Run the following command to remove the vCenter HA configuration. 
      destroy-vcha -f
    5. Reboot the Active node.
      The Active node is now a standalone vCenter Server Appliance.
    6. Perform vCenter HA cluster configuration again.