BIG PROBS with Creating RAID 0 with the Boot HD

Hey Everybody,
i have a Mac Pro with Mac OS X 10.5.3 and the folloring configuration:
1) a boot DH with 250GB
2) 2 x 500GB HD as a Raid 0 for Data
now i buy a new 250GB HD (then i have 2 x 250gb and 2 x 500 gb HDs) to create a nother RAID 0 with the boot HD... but that doesent work!
W H Y ? ? ?
i have look here in the forum fpr help, dont find a thread.
can some one help me? can i create a raid 0 with the boot hd? and when...how?
king regadrs..
christian

Lets say A and B are your 250gb drives with your current boot drive A. The two 500's are data drives C and D. My process would be to run Disk Repair on B, C and D. Then I'd run Disk Warrior on B C and D. Then boot from your DVD and run Disk Utility to repair A, just to ensure all is good. Then I would double check C and D to ensure they were duplicates, doing a Super Duper clone if needed. Then remove either C or D from your computer for safe keeping. Let's say you remove D. I would then wipe C clean and use SuperDuper to clone A to C and verify I have made a bootable perfect copy. You might even want to partition C into two drives and make two copies of A...just for temporary safety. After C has a boot copy, boot from C. Then you can use DiskUtility to create a simple RAID0 on A and B, and when that is done you can copy your C drive back into your A/B RAID. After booting from your RAID0 and then you can copy your data back from D to C (after reformatting C).
You cannot simply drag a drive from one to the other to copy it. It will not work as a boot drive doing that.
Keep in mind, if you do this, your A/B RAID has no backup. If you screw up an installation and hose it, you have nothing to fall back on. Time machine alone, or SuperDuper set to clone every day, or any of the commercial backup (or at least some of them) will give you more safety than a RAID0. RAID0 is great to save you from a single drive crashing, but more often than not the problem is installing some nasty piece of software that screws things up royally and RAID0 is wortheless for that. With your scenario, I'd buy another 250 so you can backup the RAID to that on a regular basis so if you totally screw up something you have a real bootable "last-known-good" image. After that get ANOTHER backup going to rotate off-site to save you from thieves and fires. At that point you can smile and know you really are reasonably safe. There are other ways to do this as others will explain. Several ways to skin this cat, but this is one option that will work.

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{------------ Please click the "White Kudos" Thumbs Up to say THANKS for helping.
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