Hi Victor,
If you are using FCoE the proper way to configure load-balancing is in the ethernet port-channel.
http://www.cisco.com/c/en/us/support/docs/switches/nexus-5000-series-switches/116298-configure-nexus-00.html#anc4
If you have san-port-channels the VSAN load-balancing will afftect the those.
Richard