At first I thought you wrote that you had a 1.4GB disk and a 2.3GB disk :-)
Then I read more carefully. Whew, that's a lot of disk space for a low traffic server!
You don't have any restrictions as to how to divide this much space up. I suppose if I had two disks of those sizes, I'd boot from the 30GB and use the bigger drive for the web and FTP services. I wouldn't go hog wild on allocating all that space for the OS on the first drive though. I'd use around 8GB for the OS (maybe 1 GB for /, 5GB for /usr, and 2GB for /var).
Check out the Multi-Disk-HOWTO at
http://www.ibiblio.org/pub/Linux/doc...s/html_single/
It might give you some ideas.