This video shows how to configure the Cisco Nexus Unified Port: 5548UP and 5596UP for ethernet or fiber channel. The same ports can be used for either type of connectivity. This provides great flexibility for the datacenter, without the need of planning for FC expansion modules.
Configuration steps:
http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/release/notes/Rel_5_0_3_N1_1/Nexus5000_Release_Notes_5_0_3_N1_1c.html#wp341614
