Root ramdisk, scratch KB

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1008643
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2040707
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2033073
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2037798

scratch partition
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1033696

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HA agent has an error : cmd addnode failed for secondary node: Error creating ramdisk for HA agent configuration. : Unknown HA error

If you want to create ha cluster on virtualized Esxi 4 inside Esxi4 you might encounter above error. Check if you have MORE than 2048 MB ram.
Well described here:
http://communities.vmware.com/message/1723281