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.
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..
other Centos HOW-TO's
Best of luck !!