This is pretty much the same thing we were trying to do. All hell broke loose when we installed RH9. Little things that we never had problems with started breaking. IMO, RH9 is not ready, (and may never be) for prime time server usage. As other threads on this list have mentioned, 7.3 was their last _rocksolid_ server platform. Everything since then has been to try to compete on the desktop, not the server area.
We are very happy with our redhat 9 servers. It's rock solid and fast in our experience.
Rh 8 was flaky on a few boxes, but rh 9 has been very reliable everywhere we've put it.
Mission critical, 24x7 boxes - nds servers, firewalls, dns servers squid proxies, etc.
Perhaps I could interest you in our redhat consulting services?
We specialize in RH 8/9
Kind Regards
Joe