Hello David,
Don's right, it's very simple indeed ... I have seen our Master-Guru-Linux-I've-Never-Used-Windows-consultant do it and it was a 2.5 minutes work (if you know what partitioning you want). We are using IDE on the postgreSQL server and SCSI on an LDAP server.
With the speed of IDE drives and ATA controllers and the difference in cost from IDE to SCSI I would use IDE unless you are planning on a massive server that will need high throughoutput... At least IDE is working for us :)
btw this link might help:
http://www.redhat.com/docs/manuals/linux/RHL-8.0-Manual/admin-primer/s1-storage-raid.html.
