It will not receive heartbeat and ALSO ping to the isolation address also failed. So, host will think itself as isolated and HA will initiate the REBOOT of virtual machines on the host to other hosts in the CLUSTER. Why do you need this unwanted SITUATION while performing scheduled maintenance window.

To avoid the above situation when performing scheduled activity which may CAUSE ESX host to isolate, remove the check box in ” Enable Host Monitoring” until you are done with the network maintenance activity.

It will not receive heartbeat and also ping to the isolation address also failed. So, host will think itself as isolated and HA will initiate the reboot of virtual machines on the host to other hosts in the cluster. Why do you need this unwanted situation while performing scheduled maintenance window.

To avoid the above situation when performing scheduled activity which may cause ESX host to isolate, remove the check box in ” Enable Host Monitoring” until you are done with the network maintenance activity.