no, mac os x can def do this! Check out the following link for some more info on xgrid.

I would love to see these put into some sort of rack looking configuration. That would be sick. Make a mod guide too wink
"Fix it 'til it Breaks."

Jacob - EiC & Director of Technology
Mac Pro Quad 2.66 - 4GB RAM
160 GB SATA RAID 1 - 650 GB Storage
Quad 19" Widescreen LCDs
Accessorized to the Hilt