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RAID sets and partitioning

Title: RAID sets and partitioning
I have 15 PowerMac G4’s, each with 2 120GB hard drives.  These systems are used in a digital media lab.  Obviously performance and drive capacity are key elements in this lab.  Option A is to use one drive for the system and the second drive for scratch.  If we were to use this configuration we would be wasting about 100GB on the system drive because our image is only about 20GB.  Plus we do not want to give our users read/write access to the system drive.  Option B is to use Disk Utility to RAID 0 (stripe) the drives together.  We benefit from this because of the speed, but Disk Utility does not allow partitioning of a RAID set for us to create a system partition and a scratch partition, at least not from the GUI.  Upon further experimentation I found that if you run diskutil from the CLI you can partition a RAID set.  At the surface level this seems like an ideal solution.  We would be working with a RAID 0 set and have our 2 partitions for a system drive and a scratch drive.  I am willing to bet that this isn’t a supported configuration.  Has anyone tried this and had success?  Am I setting myself up for failure with this config?  I don’t see any reason why a RAID set can’t be partitioned, but because it is not supported in the GUI I am a little hesitant of doing it.  Any suggestions or comments would be appreciated.
Thanks,
Mike 
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