iscsi port binding with lacp or link aggregate compatible

hi all,

is it not possible to have link aggregate with iscsi port binding on esx5.0 and esx5.1?  i tried doing standard and dvswitch link aggregate and it won't show in the compatible port bindings list.  Only if I create a single switch then it will work.

So if that's true, the only thing I can make my iscsi port binding bigger than 1G is to have 10G nic?

And what's the difference between by not putting iscsi port binding and putting it?  Link Aggregate will work with iscsi connection without putting an iscsi port binding but is it safe not to put it?

Thanks for any comment you may add.