one more point - if we use the IP HASH for storage... it is not necessary we will get aggregated thoughtput,,, because the IP hash calculated for source and destination... you can see more details on the thread
http://communities.vmware.com/message/2173830#2173830/
http://frankdenneman.nl/networking/ip-hash-versus-lbt/
http://frankdenneman.nl/2009/11/13/nfs-and-ip-hash-loadbalancing/