Hi, my configuration is like this:
2 x 120gb Seagate SATA
and onchip RAID controller. I have already set up in controller's internal bios RAID 1 array. On computer boot promt it shows everything is just fine: Mirror Disk 1 Disk 2.

When i start installation of FC2 linux, my onchip raid controller is correctly detected and right driver is loaded. Then comes turn for partitioning and... surprise! There are still 2 separate hard drives sda i sdb.

I don't want to use software RAID because i don't believe its reliability.

How can i make it one drive to system installer?

szeroki3xl;go to http://tldp.org/HOWTO/HOWTO-INDEX section 5 single list
howto,s page 40 raid howto cookbook of 56pp,s may find answers.

You should see a device name md0.

BTW, on-board controllers like Silicon Image, Promise, Highpoint, VIA, INTEL does not do hardware RAID.