Hi,
wow, that's an unusual idea
But first of all, how much memory do you have ? And why are you planing to use 3 GB swap ????
In my business we are working with Fileservers of 32GB RAM and even they have only 2 GB and only using more or less nothing, so why do you need this amount of swap ?
regarding the raid issue, you want to use raid 1 , right ? raid 1 is mirroring and doesn't provide any performance improve, it is only redundant to have the data save. and in general, with using a hw raid, indipendent which raid level, the bios is doing this stuff and the operating system only gets the raid device file, so it doesn't cares what is behind the raid device file, it simply uses it.
Therefore, you can do what you are planing, weather it is usefull
Cheers
malcom