text: – The cluster can be connected to a maximum of 1024 WWNNs. The general practice is 
  that: 
  
  (cid:129) EMC DMX/SYMM, all HDS, and SUN/HP HDS clones use one WWNN per port. 
  Each port appears as a separate controller to the Storwize V7000. 
  
  IBM, EMC CLARiiON, and HP use one WWNN per subsystem. Each port appears 
  as a part of a subsystem with multiple ports, up to a maximum of 16 ports 
  (WWPNs) per WWNN. 
  
  However, if you plan configuration that might be limited by the WWNN maximum, verify 
  the WWNN versus WWPN policy with the back-end storage vendor. 