When a virtual machine is running on a physical host and loses network connectivity, such as a public or private communication channel, VCS on each node is not able to communicate. This is a classic split brain situation. VCS running on a node thinks that the other node has crashed and initiates a virtual machine failover.However, the virtual machine is still running on one node while VCS attempts to start same virtual machine on another node.

If this issue occurs, configure disk based fencing to prevent a split brain situation due to a network partition.