MSteineke
I have been working with Infiniband cards in a few different Hyper-V clusters. I did some work with Hyper-V over SMB on Windows 2012 Beta, and it was very impressive. While waiting for my production IB switches, I have been testing Live Migration on a Cluster-in-a-Box with 2 IB cards with basically a crossover cable between them. The migration performance is ridiculously fast. I have 50 1GB vm's, and I can migrate them from node to node in under 20 seconds. The IB network interface hits about 30 Mb/sec.
I am going to test with different numbers and sizes of VM's and I will share the results! I think the results are going to be very interesting.