I just placed an order for an 8-core mac pro. I had originally decided to wait for Leopard, but with it being pushed back to October, I decided waiting another 5 months wasn't worth the hassle. Plus now it may be January before it's out, and I really need a good desktop machine to replace my MacBook Pro from being my everyday computer. Anyway, I'm wondering if anyone could tell me if it's much trouble put the boot drive in a mirrored RAID (RAID 1)? I just ordered the machine with the standard 250GB drive but will be ordering 2 500GB Seagate drives to use in it (I'll probably toss the 250GB in a FireWire enclosure). Since I'll have to reinstall OS X anyway, I'm wondering if I have to setup the RAID while installing, or if it can/should be done after the computer is up and running. I naturally don't want to take a big performance hit, but my understanding is that it's generally not too bad. Is this true? I won't be doing anything that requires the absolute fastest read/write speed possible, anyway. My reason behind wanting to do it is for data integrity. I have a 1.2TB fileserver set up that I'll be having the computer backup nightly to (or maybe just weekly if the RAID works out). However, that still leaves a window for data loss in case a drive fails between backups. With a RAID 1, I'd have a full copy on 2 drives and if one dies, I should have time to replace the dead one and not lose anything at all. Just another level of security, really.