IDE mirroring controller?

[Raid]

I have seen an ad for a PCI IDE controller that will allow up to 4 IDE
drives to connected in a stripe &/or mirror combination. The ad said that
the controller was compatible with just about everything - Windoze, Unix,
Linux, Novell, DOS, NT etc. I thin you just dropped it in and then booted
DOS and ran a utility to set it up. Does anyone know what I am talking
about? I can't remember what it was called or who made it and I am trying
to mirror 2 x 17Gb IDE drives with Red Hat 6.0

Brad