Table 6 is incorrect, and incorrectly labeled, "Per SP".  For a CX4-120 front-end data ports per SP: 2 or 6 Fibre Channel, 2 or 4 iSCSI.   A correction will be applied in the EMC CLARiiON Best Practices for Performance and Availability, FLARE Revision 30.0, which should be available shortly on Powerlink.   
confused from the whitepaper " EMC clariion best practices for performance and availability release 29.0 firmware update applied best practice"  page no 34 .. table 6  it says that max fibre channel ports /SP for cx4-120 is 12..  ok.. now..  CX4-120 uses able ULTRA FLEX i/o modules are 3/SP  slot 0 = 4 fc ports ( port 1 cannt use) 0 for backend , 1 cannt use and 2,3 for FC ports slot 1 = 4 port fc card (optional) slot2 = 4 port fc card (optional)  now total comes to 10 front end ports..  (above) am i right ?  now how come this document shows as 12 front end ports per SP ?  please help me understand or is that typo ?
Max FC ports cx4-120