How to stripe and mirror 4 drives on my Mac

I have a Mac Pro. 4 internal 2TB SATA drives. I've already striped two drives as one array. I then used Carbon Copy Cloner to clone my boot drive to the striped array. It boots up and works fine (with a BIG increase in disk speed). I've striped the other 2 drives as one array. Disk Utility doesn't seem to allow me to Mirror the first array to the second array (RAID 0 + 1).
Am I missing something here? Or do I need to buy a 3rd party app (like SoftRAID 4)?
thanks

Well this article http://support.apple.com/kb/TA24359 seems to explain how to us disk utility to make a raid that's a mirror set of two striped drive or stripe two sets of mirrored drives. I've always used raid utility to make my hardware raids.
While the article doesn't specify call out if creating a raid will destroy all data on your current raid; it seems implied; so I would suggest backing up the raid to an external drive before trying to create your 0 + 1 raid.
let me know how it turns out.
-TT

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