Depending on what FLARE youa re using,  there used to be a check boxfor access logix.  That enabled storage groups and stopped each host from seeing every lun on the system.  Now they put the "storage group" option.  you need to check that box if you want hosts to only see certain lun's  It is not enabled by default if i remember right.
      I recently started working on a new clariion and noticed a unusual thing (It was for me atleast) I zoned a couple of hosts to the clariion and registered them manually. Then created 2 new luns and when I went to its properties it showed to me that both the luns were assigned to both the server's I had zoned to the clarion.  Digging in I found a that Access logix was active and the storage pools check box was unchecked in the storage system properties window.  Is that the default? If yes I am trying to figure out what the use cases would be.
storage groups