vCenter HA protects the vCenter Server Appliance (VCSA) against Host and
hardware failure, as well as reduce downtime due to VCSA patching. After configuring your network for vCenter HA, you implement a 3-node cluster comprised of Active, Passive, and Witness nodes.
▪ The Active node
– Uses the active vCenter
– Contains the public IP
– Uses the vCenter HA network to replicate data to the Passive node
– Uses the vCenter HA network to communicate with the Witness node
▪ The Passive node
– Is initially a clone of the Active node
– Receives updates from and synchronizes state with the Active node – Automatically takes over Active node roll in event of a failure
▪ The Witness node is solely a lightweight clone of the Active node protecting against a split-brain scenario