I was provisioning some VM's from templates in our ESX4.1 cluster last week. First VM (Win2k8 R2) deployed fine, but something very weird happened on the second one (same template).
After starting the VM, it hung about half way through the BIOS initialization screen. Absolutely nothing I could do would kill the VM, and when I finally did clear some things, I had locked resources. I google'd around, and found all the workarounds to try and free this, but eventually had to resort to migrating all the other VM's off the host and rebooting it. I tried starting the VM again, and the same thing happened (and ultimately another host reboot)!
Other than the fact I've not yet worked out why the VM hung (I'm in the process of rebuilding the templates), one other thing that happened during all this was that the cluster seemed to initiate some sort of HA event. Nothing has changed as far as I can see, and all nodes in the cluster are now working fine, but I now have a nice yellow warning triangle on the cluster icon in the VC tree view that I cannot get rid off. If I look at the error, it says;
HA initiated a failover action in cluster xxx in datacenter yyy
As far as I can tell, HA is working fine in the cluster, but I cannot seem to clear this warning. Anyone have any ideas?