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.
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Click the Configuration tab.
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Click Advanced Settings.
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Choose ScratchConfig.
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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/.
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Select the ScratchConfig.ConfiguredSwapState option.
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Click OK.
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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.
Source :
from the VMware Site