Want to setup what I think is a NAS*HELP*

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Im using the UFS and have 4 1TB drives in Raid 0. I plan on upgrading to 6 2TB drives after xmas

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Just a minor update. I upgraded to Freenas 8 beta and I have to say it works a bit better but the gui is crappy in comparison to v .7. Also you can't add a drive without formatting it so I can't add my old data. It was fine with the majority of my movie collection but I did backup some on another drive in hopes of re-importing it. So that sucks. I did however save my freenas OS on a USB drive so I can easily restart it using the old USB drive and move the files that way but it's a PITA to say the least.