Problems setting up RAID on a Mac Pro 2.1 using all 4 drive bays

Hi,
I'm trying to repurpose my Mac pro as a network storage device and have bought 4 x 3TB WD Red drives so I can use it as 6TB of storage that is mirrored. I'm running into several problems and could do with a bit of advice.
I have tried booting from the OSX Snow Leopard installer and running Disk Utility to setup the RAID 1 system, but every option I try ends up with an error message saying it failed because it was "Unable to find RAID"
If I actually go ahead and install the operating system it will allow me to use Disk Utility setup up the RAID systems on the drives, but only 3 of them as it won't allow me to use the boot disk.
Is it actually possible for me to create a setup where OSX is installed on a RAID system? Currently I'm trying to install OSX to an external drive so it will allow me to setup all 4 of the internal drives as a RAID system...and I was hoping once that is done I can install the operating system on an internal drive
I also tried partitioning one of the drives so that I could install OSX on that and use the rest of the storage for RAID, but the install kept failing.
Can anyone recommend any solutions for this? Currently it seems like my best option might be to permanently use a small external HD as the boot disk, leaving the 4 internal drives to function fully as a RAID system
I was hoping to set up 2 pairs of striped drives that are mirrored. I think this is RAID 10?
Any help greatly appreciated!
Thanks

A couple different ideas.
Install OS X somewhere else, then use CCC to clone to your array.
Don't use 1+0 type array.
Invest in SoftRAID and set up a 3-drive mirror - you have to shutdown to swap drives, but you can do a better mirror and faster rebuild plus it uses all drives in a mirror for reads so performance is enhanced.
People had mixed results and support using a 4-drive mixed mirror+stripe setups.
Apple's "Pro RAID" card has had I think poor support, limited to 2.2TB but could do RAID5.
Put the system on PCIe SSD blade XP941, bootable in Mac Pro 1,1 and above running 10.5.x and above; and then have a good clone and restore, and put all the data on your array - and I would still go for a simpler mirror-only with http://www.softraid.com

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