VMware vSphere 6.5 – vCenter 6.5 High Availability Feature (for the VCSA)
As of vSphere 6.,5 you can configure true vCenter High Availability (almost like the old vCenter Heartbeat which has been depreciated for some time) With this new feature you have an active & passive VCSA. The active is receiving & responding to requests from other VMware software such as SRM, ESXi...