A customer had 17 ESX servers in stress, after a thermal error 3 blades went off line and disk 0 was gone. HA gave an error on all servers and reconfigure HA didn't do the job.
An error occurred during configuration of the HA Agent on the host was the error. I disabled HA on the cluster and enabled it, afther this action ervy server was back online and no error's. I suppose that the setting that only 2 servers can fail for HA was course of this error, 3 servers went down at the same time and VMware ESX did't see the old servers online therefor it was not allowed to reconfigure the hosts for HA. Disable HA and enabling HA pushes an new HA settings set to the ESX servers and makes it possible to reconfigure it for HA.
Error when enabling HA on ESX 3.5 i servers : Host in HA Cluster must have userworld swap enabled
This error you get from a lack of storage reservation for saving the HA settings on the ESX3.5i. You can set this using the following procedure.
To enable swap on your ESXi 3 host system:
On the VirtualCenter Server, select the ESXi 3 Server host.
Click the Configuration tab.
Click Advanced Settings.
Choose ScratchConfig.
Configure ScratchConfig.ConfiguredScratchLocation to a valid directory with sufficient space (1GB) to hold the userworld swap file. The userworld swap can be configured on local storage or shared storage.
Note: Each swapfile needs a unique name across all ESX hosts.
For example, /vmfs/volumes/.
Select the ScratchConfig.ConfiguredSwapState option.
Click OK.
Reboot the ESX Server 3i system.
After you have enabled swap on the ESXi 3 host system, you can add the host to a VMware HA cluster.
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