It is unfortunate that manufacture of equipment can get away with stuff like this.
However, lets point you in the right direction.
Nearly all of these motherboards and the cheap controller cards that say they have RAID on aren't telling people the whole truth. Yes you do have RAID, but it is not "true" RAID.
What is "true" RAID. Well it is RAID that is implemented in the hardware and the hardware alone. ie, you plug it all in the system, somehow get in to the config (normally you well see a prompt during initial booting). You define the RAID array and then carry on booting. Any OS will then see it as you defined the array.
What you have is known by a few names, Adaptec call it Hostraid (something like that). Others call if Softraid, Fakeraid, amongst other names. In this method you will often configure an array in the same way as above, but here is the catch
, the OS needs a special driver to be able to see the array. So unless you have a kernel with the relevant code built in you will only see the individual disks of the array.
Now some of these manufactures who sell this fake raid have kindly released the information on how to speak to the array, others have not. I'm not sure if your setup is supported, but i'm sure someone on here will be able to tell you.