Hello, I've got the Sans Digital TR8MP and I got it working with amahi.
All you have to do is visit the website for the raid card (in my case,
http://www.highpoint-tech.com/USA_new/series_rr600.htm), then click the download section. In there, choose your raid card, click the download driver link, choose the proper fedora dist, then extract those files somewhere on the amahi server. Then, as root, run install.sh (sh install.sh). Once this is done, the driver is installed. Then, you'll probably want to install the web gui (allows you to modify your raid array settings w/o rebooting). Just follow the install steps for that.
In my setup, I can add new hard drives to the storrage tower, add it to its own JBOD "array", format it, add it to greyhole in less than 10 minutes ! Works like a charm. Let me know if you've got any questions.
Eric