My home e-smith server, used entirely as a gateway/mail server, is running on a Pentium 200MMX with 64M ram (That's what I had on hand at the time, not for any other reason than that) and has been running great for a couple months with only a 512M HDD. I don't remember how much HDD space I had left over after install, but it still has plenty for now. I believe you can use the df command to see how much file system space is free, and you will want to do so from time to time just to make sure you're not running out esp if you have users that will use it as a file server to store their personal files. One of our servers choked the other day (ok. ok... it was microsoft boy's server (NT... I don't claim em as mine)) because of lack of disk space. We found almost 5G. (yes folks, thats G as in GIG) of MP3 files on it. I STILL can't believe microsoft boy wouldn't let me get the guy fired!!! (The machine is a production machine at work)
well... anyway... It should work fine...
cryblood