[Centos] Upgrade from RH-9 to CentOS-3.1, any issues?

[addymin@xxxxxxxxxxx (Mike)]

Greetings,

I've got 4 Redhat-9 servers in a production environment and I don't feel 
like moving to RHEL.  So I'm testing CentOS-3.1 now.  So far so good.

I'd like to get these servers moved over in the next month or so to a 
better "supported" OS.

Are there any issues I should be aware of in upgrades these RH-9 boxes?

Should I be able to just stick in the Centos-3.1 CDROM and choose upgrade?

Thanks,
Michael