Choosing the way of creating RAID-1. Need advise.

Hi, everyone!
I've got a Pentium 4 PC as a server. :)
It doesn't support SATA disk itself. So, I've bought PCI Controller card by STLab, model A-224 (PCI SATA4 channel (2P+4P) with RAID card).

I can either setup RAID using BIOS of the card or not -- during FreeBSD installation I see both of these disk (as ad4 & ad6). That is why I decided that it is a soft-raid adapter. And I suppose that I need to setup a software RAID.

The questions are: what way to choose (atacontrol, or gmirror, or smth else)? And why? And whether setup RAID in BIOS of the card or not? And why? :)
 
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