A question came up in yesterday's “Chad's Choice” webcast about choosing which hosts in a cluster would be configured as HA primary nodes. I'm not going to go into any great detail here about what HA primary nodes are because there is a more comprehensive article on HA freely available over on the Yellow Bricks blog of Duncan Epping. The short answer to whether or not you can choose HA primary nodes is a simple “no”. It's not possible. Things are rarely simple though. Technically it is possible (again see Duncan's HA deepdive page for details)…
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If I wanted to, this could be a very big post all about configuring HA correctly. But I don't want to reinvent the wheel. Instead I just want to share my experiences with this error: HA Agent on ESX-HOST in cluster CLUSTER-NAME has an error Odds are that you will eventually see this one pop up in vCenter for one of your ESX 3.x hosts. If you're not sure what it means, well the translation basically is that the host displaying the error could fail and your VMs running on it probably won't get started up automatically on another…