Onboard RAID and Ubuntu Install - Why Does it See Separate Disks?

Solution 1:

i've taken a look at mb specs. have you by any chance connected disk to ICH10R ports ?

what you describe sounds very much like there is soft-raid not a 'real raid' in use. those works fine with windows but do 'heavy lifting' [ xoring for raid5 ] on your main cpu instead of dedicated controller.

Solution 2:

Hate to say it.. but the Supermicro X8DT3-LN4F and all their new motherboards don't have Ubuntu support. The only drivers available are for RH or Suse.

On a side note... the onboard controller that comes with most motherboards is also called a 'fake raid' by some. There is more details on this provided in Ubuntu help area:

https://help.ubuntu.com/community/FakeRaidHowto

The end result was that I needed to drop the onboard raid and stick to native sata.

If I want RAID in the future I will need to buy a card.

Hope this helps