You're looking in the wrong place. The md
driver is for software
RAID, while your server has hardware
There's a good chance your server has the HP Array Configuration Utility installed. Try this command:
hpacucli controller all show
It should show the slot number of your RAID controller. Then try this:
hpacucli controller slot=<slot_number> logicaldrive all show
with the number reported by the first command, and you should see the status of your RAID array.
Hardware arrays are driven by a CPU on the RAID controller, and presented to the OS through a driver as a single hard drive.