ESXi Embedded and HA
I have a feeling that not a lot of people have run into this issue yet, but as ESXi becomes more mainstream, this problem will crop up more and more. You see when you have an ESXi Embedded host that has no storage ( most likely a blade ) and you try to add that host to a HA cluster you get an error message similar to the following:
HA agent has an error : Host in HA Cluster must have userworld swap enabled
It turns out that you can't add an ESX host without swap enabled into an HA cluster, so you need to turn to the advanced options of the host and set ScratchConfig.ConfiguredScratchLocation to point at a valid datastore with more than 1GiB of space free. You can see the fix in this VMware KB Article
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