Hi,
You do need a special switch for FCoE. Today the switch for FCoE must have what is called an FCF which is provides the encapsulation/decapsulation of FCoE frames and the FCoE name server functionality.
For more information on FCoE, see my recent blog post http://blogstu.wordpress.com/2009/09...nt-state-fcoe/
Let me know if I can be any further help.
Note that while InfiniBand is a nice solution for low cost, low latency cluster environments (popular in supercomputers), there are few storage solutions and the whole market has much more momentum for moving to Ethernet based options (including FCoE which will help the existing FC customers move to Ethernet).