One of the major shortcomings of vCenter has been lack of HA for vCenter. HA has been around for a long time but it never supported dual CPU so therefore no use for vCenter.
With the latest version of vCenter VMware have addressed this issue and created a purpose built vCenter HA configuration with a separate heartbeat network. What’s even better is that it is really simple to implement, manage and test.
You can read the full how-to of implements vCenter HA here.