HA agents communicate with each others and monitor the liveness of the hosts in the cluster. This is done by heartbeat exchange. By default, every second. If a 15-second period elapes without the receipts of heartbeats from host, and the host cannot be pinged, it is declared as failed. The VMs were running on failed host will be failed over to others hosts in the cluster with most available unreserved resource. (CPU and memory)
A cluster can have up to 5 primary node, and 27 secondary node.
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