[Shan]

WHS will just see your RAID as one big disk, it has no knowledge of what protection you are adding at the hardware/firmware level. With the way WHS protects data by writing to what it thinks are multiple physical locations, you aren't really buying anything using RAID (except speed in the case of RAID 0).

Another gotcha I have read about, which I haven't confirmed is true yet, is that you should put your WHS system drive on the largest physical disk, because when you copy to a protected/duplicated WHS share everything gets written to the system drive and then balanced out from there.

Before I rebuilt my WHS last night (not happy, I really wanted the HP rather than paying for OEM on my piece of junk) I noticed I was getting warnings about system disk space when copying to the shares, which stopped a few minutes after the copy finished, which would suggest it's true as I was only using a 20GB partition for WHS. I've now made the first disk one volume and it does seem happier.