2 iero
AFAIK, for MacOS X to work with SAS drive, you'll need Apple SAS RAID Card (or how is it called correctly, dunno much of this ), which bases at LSI Logic controller. According to specs I fount, your machine have PCI-X 133 controller. I doubt that Apple or controller maker have universal kexts for your hardware (some of kexts ARE PowerPC only for PowerMac's compatibility). That's it . (All this is my IMHO, I'm not a guru in this).