Host network isolation occurs when the host is still running, but it can't any longer communicate with other hosts in the cluster. by default settings, if a host stops receiving heartbeats from all other hosts in the cluster for more than 12 seconds, it attempts to ping its isolation address. If tis also fails, the host declares itself as isolated from the network.
When thie isolated hot's network connection is not restored for 15 seconds or longer, the other hosts in the cluster treat it as failed and attempt to fail over its VMs. Since the VM files are locked by isolated host, and will won't proceed. The default action is to leave VM powered on isolated host.
To use the Shut down VM setting for host isolation response, VMware tools need to be installed on the VM. This option could reserve the VM state. If Shut-down take longer than 300 seconds or other defined time, VM will be powered off.
das.isolationShutdwonTimeout
If you ensure network path redundancy, host network isolation should be rare.
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