Dude,
Have you had a look at the red hat linux website, to see if red hat support's your raid card? Here is an idea!
If red hat does, Esmith probably will, with some work, as Esmith is based on red hat linux. You would have to install Esmith, then hack in the raid driver's. I would sugest a seperate OS hdd, and then run your share's on the raid array.
Grab the rpm's from red hat if they exist for your raid card, and play wtih getting it going.
I have my Emsith 5.1 setup on my dual pII server ( upgrading soon, when i get time to 5.6, along with a larger OS hdd

) with a 850mb OS hdd, and a 60gb share hdd, for games server's and server side storage. I'm upgrading my dual pIII workstation's raid card as well, so my Esmith will get the Promise FastHack66 raid card, and i shal buy another 60gb hdd.
It won't be easy, but the result's should be worth it.
Cheers
ToranaGuy