What RAID setups work for each setup?

Can anyone point me to a source that can give me detailed information about what RAID setups are best for each situation. Our current situation is that we have:
2x Xserve RAID running on Xsan with two Xserve G5 servers, one for media and the other for Metadata.
We are thinking about using one whole RAID (2x LUN) for Media, and 1 LUN of the other RAID for metadata, and then the second LUN of the second RAID for switchable media (backup on HD's). So what RAID is best for media and what is best for metadata? Is it possible to set a whole RAID with two LUNs as RAID 0 or would it need to be seperate?
If someone has some info about what RAID setups work best I would be happy to hear about it!
We will be connecting 3x FCP machines through fiber, but other workstations will be connected through a deticated ethernet switch with 1Gb connection to the Xsan but 100Mb connection to the Switch.
Best regards,
Orvar Halldorsson
Sagafilm

You can also try the Xsan Tuning Guide. It recommends that the Meta info be striped as raid 1. When you are in RAID admin and click on create array it will tell you which raids are good for speed and which ones are good for protection. Here is the link as well
http://manuals.info.apple.com/en/Xsan1.1TuningGuide.pdf
There is also an app you can download to test the bandwidth of the volumes.

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