Hi, 
I have fairly simple system. AFF300 controllers.
2 shelves. 
storage shelf show
 
                                                       Module Operational
       Shelf Name Shelf ID Serial Number   Model       Type   Status
----------------- -------- --------------- ----------- ------ -----------
              1.1        1 SHFGD1613000010 DS2246      IOM12  Normal
              1.2        2 SHFNC2108000186 DS224-12    IOM12  Normal
2 entries were displayed.
 
Modules on both shelves are IOM12. ALL disks are the same 1.6tb SSD X365
 
Would there be any performance difference between shelves?
All ports are showing 12GB but i am not sure about backplabe for the shelves. since one is DS2246 and other DS224.
 
Thank you, 
Martin