2340 ctrlr = highpoint rocketraid 2340 sata controller, with 4 miniSAS ports each
enclosure is http://www.pc-pitstop.com/sata_enclosures/scsat84x.asp, with 2 SFF-8470 ports

fileserver
   /dev/mapper/lvm (md0, md1, md2, md3) =~ 12.7TB

           pci-e                                    pci-e
       2340 ctrlr #1                            2340 ctrlr #2
     *    *    *    *       SFF-8470 to       *    *    *    *
     |    |    |    |   <--   miniSAS   -->   |    |    |    |
     |    |    |    |         cables          |    |    |    |
     |    |    |    |_________________        |    |    |    |________________
     |    |    |____________________  |       |    |    |___________________  | 
     |    |_______                  | |       |    |______                  | | 
     |__________  |                 | |       |_________  |                 | | 
enclosure 1     | | enclosure 2     | | enclosure 3     | | enclosure 4     | | 
md0 500GB SATA _| | md1 500GB SATA _| | md2 500GB SATA _| | md3 500GB SATA _| | 
    500GB SATA _| |     500GB SATA _| |     500GB SATA _| |     500GB SATA _| | 
    500GB SATA _| |     500GB SATA _| |     500GB SATA _| |     500GB SATA _| | 
    500GB SATA _| |     500GB SATA _| |     500GB SATA _| |     500GB SATA _| | 
    500GB SATA ___|     500GB SATA ___|     500GB SATA ___|     500GB SATA ___| 
    500GB SATA ___|     500GB SATA ___|     500GB SATA ___|     500GB SATA ___| 
    500GB SATA ___|     500GB SATA ___|     500GB SATA ___|     500GB SATA ___| 
    500GB SATA ___|     500GB SATA ___|     500GB SATA ___|     500GB SATA ___|