raid question

I'm looking into RAID, and as such I started to read the suse manual and the raid howto on the web. I still have some questions that someone on this list can answer. 1) Is it possible to add a soft raid after installation? The system I want to extend with raid (raid 1) is already up and running on single disk system (it has 2 disks). 2) How does one enable hardware raid. The motherboard has an onboard hardware raid controller. The controller does not really seem to be supported by linux (Promise 378). Anyway, I ask this out of interest ;) In case of hardware should it be done via the bios or completely different? -- Richard Bos Without a home the journey is endless