take a look at Chad's blog entry  [URL]
Friends,  I'm finally back in an all EMC environment and I'm deep diving into things like ALUA, VAAI, FAST Cache and other fun stuf that's coming my way.  I now have a couple of new hosts and I want to enable everything that can possibly make everything faster [IMAGE] and ALUA (Failover mode 4 + round robin) and FAST Cache are all clear to me, but VAAI isn't. I've tried to find some sort of compatibility list to see the prereq's for VAAI, but all I can find is Flare 30. Is that really all there is to it on the storage side or do I need Snapview or MirrorView enablers as well ? (I have those active, but I'd like to know if I need them for future reference).  ESX is version 4.1i  Any thoughts ?
What are the prerequisites for VAAI ?