Usage:  sg_rdac [-6] [-a] [-f=LUN] [-v] [-V] DEVICE
  where:
    -6        use 6 byte cdbs for mode sense/select
    -a        transfer all devices to the controller
              serving DEVICE.
    -f=LUN    transfer the device at LUN to the
              controller serving DEVICE
    -v        verbose
    -V        print version then exit

 Display/Modify RDAC Redundant Controller Page 0x2c.
 If [-a] or [-f] is not specified the current settings are displayed.