Boss is nice, trying only to help him here, he knows it is not supported. I didn't test yet removing the PERC controller and setting it up with 4 HDs. Since it is not a so urgent problem I'm taking my time and experimenting with it. I also have some good experiences with "non-supported" OS and in fact this is the first time I've got to a problem that seems to not have a solution... I will play with it for a couple more days and if I get to a solution I will post it here.
Again thanks for your help. Happy Easter.
Speed