I have the same problem, the configuration hardware is 2 raptor in raid 0 and the same main board Aus A8N- Sli but with Mandriva 2008 and Fedora 8 the raid is recog correctly and detecting, I probe with dmraid release RC14 but the same problem, with Ubuntu not posible, only one raptor device in the raid, with Mandrive and Fedora all OK, install and boot very good.
I have the same problem, the configuration hardware is 2 raptor in raid 0 and the same main board Aus A8N- Sli but with Mandriva 2008 and Fedora 8 the raid is recog correctly and detecting, I probe with dmraid release RC14 but the same problem, with Ubuntu not posible, only one raptor device in the raid, with Mandrive and Fedora all OK, install and boot very good.