I wouldn't use redhat 9 it hasn't been supported for like 6 years..
For a Server, if you want a redhat based Distro I would suggest looking at
Centos 5.3 it's the equivalend of Redhat Enterprise Linux 5.3.
the
aacraid driver module for the
PERC3/DI controller which is most likely in that server, should already be included in Centos 5.3, so you shouldn't have to worry about downloading a driver.
how-to Forge should have some good Setup guides as well if you are interested.. for instance..
http://how2forge.net/perfect-server-...64-ispconfig-2
other Centos HOW-TO's
http://how2forge.net/howtos/linux/centos
Best of luck !!