Are your iscsi hba's 1gig or 10gig hba's?
But some general suggestions.
Make sure you have jumbo frames enabled on the filer, the switch and your vsphere hosts.
Make sure you have your virtual guests partitions aligned
properly. Do a google on netapp partition alignment and read up if you
aren't already familiar with.
Another thing you'll want to know before the move is, Are your hosts
even fully utilizing and pushing your 1gig (I'm assuming) iscsi network
throughput. If they aren't doing this then 10gigs isn't really going to
do much.
On the filer end of things, check to see how hard it's being pushed right now. Does your filer even have 10gig cards in it?
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StarWind Software R&D
StarWind Software R&D
http://www.starwindsoftware.com