Why can't I install IOS x Lion on Mac RAID?

I have a Mac Pro, OSX 10.6.8. Four hard drives 6TB in total. 3TB Start Up RAID striped, 3 TB backup Time Machine. I want to install Lion but get the message an error has occured. Any advice please?

I am not a fan of installing Mac OS X on a RAID. I think you get a better overall performance boost from establishing a Boot Drive, which stops the System from competing with your data reads and writes.
RAID gets its speed from having the heads sitting right at the next spot to read from, and having the second drive transferring while the first drive is seeking. Mac OS X does a whole lot of "snacking" -- reading (and some writing) smallish bits of stuff from all over the Boot Drive. So it does not really get much of a boost from RAID. And having data and Sytem mixed on the RAID slows down both, because frequent System accesses move the heads away from the data files.

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