Not a lot of info is found when you Google for manually selecting/fixing the primary HA nodes in a VMware VI or vSphere environment. Of course Duncan Epping has a couple of extremely interesting posts on Yellow-Bricks.com concerning HA even when it comes down to selecting or promoting the HA status of ESX nodes (a must read!), but I want more …

Let’s start with what I assume to know about HA:

- HA works with primary and secondary HA nodes
- The primary nodes are aware of the states and configs of all nodes in an HA cluster
- The secondary nodes depend on the primary nodes
- There is an supported limit of 5 primary HA nodes per cluster
- The first 5 ESX hosts that are added in a HA cluster are initially defined as primary HA nodes
- All the other hosts that are added to the HA cluster are configured as secondary HA nodes
- There’s a way to configure a HA node as primary or secondary, however it’s not possible to configure an ESX host as a “fixed” primary HA node:
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