what is VMware High Availability

HA protects against unplanned physical server failure by providing a way to automatically
restart virtual machines upon physical host failure

if physical problem to server occurs then only that server will be down
but on virtual server many servers are effected so answer to this is HA

virtual machine migration that occurs when an ESX/ESXi
host that is part of an HA-enabled cluster experiences failure.

configure VMware HA to monitor virtual machines and restart them
automatically if they fail to respond to an internal heartbeat

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