Installing OSX on new Raid setup

HI Everyone,
i have four internal 250 Gb hard drives, i switched the startup dick to an external so I could set up the raid.
I set up a stripped raid consisting of two mirrored raids per the Apple database. it seems to work in as much as my four disks that showed up on my desktop previously show up as one with a capacity of 465 Gb.
so in theory, it looks like i have successfully made the RAID. Disk utility says it is online.
so, my question is, i tried to install OSX on the RAID and it says that it can not install OSX on this disk?
is there a trick I am missing?
I TRULY appreciate your help and comments

Are these drives all set up using the GUID partition map? Did you erase the drives before setting up the RAID? Are you trying install OS X using the OS X Installer Disc One that came with the computer? Have you tried cloning the system from your external drive?
How to Clone Using Restore Option of Disk Utility
1. Open Disk Utility from the Utilities folder.
2. Select the backup or destination volume from the left side list.
3. Click on the Erase tab in the DU main window. Set the format type to Mac OS Extended (journaled, if available) and click on the Erase button. This step can be skipped if the destination has already been freshly erased.
4. Click on the Restore tab in the DU main window.
5. Select the backup or destination volume from the left side list and drag it to the Destination entry field.
6. Select the startup or source volume from the left side list and drag it to the Source entry field.
7. Double-check you got it right, then click on the Restore button.
8. Select the destination drive on the Desktop and press COMMAND-I to open the Get Info window. At the bottom in the Ownership and Permissions section be sure the box labeled "Ignore Permissions on this Volume" is unchecked. Verify the settings for Ownership and Permissions as follows: Owner=system with read/write; Group=admin with read/write; Other with read-only. If they are not correct then reset them.
For added precaution you can boot into safe mode before doing the clone.

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