Hi Per
This depends upon your setup. UCS can directly connect to NetApp, using appliance ports; however if you are doing native FC and need to configure zoning you will have to use FC switching mode.
Following documents explain these scenarios
http://www.cisco.com/c/en/us/support/docs/servers-unified-computing/ucs-5100-series-blade-server-chassis/116075-ucs-app-connectivity-tshoot-00.html
http://www.cisco.com/c/en/us/support/docs/servers-unified-computing/ucs-infrastructure-ucs-manager-software/116082-config-ucs-das-00.html