Aperture RAID plan - any thoughts?

I'm about to setup a RAID for Aperture and wanted to see if anyone had any thoughts about my plan. I need to build a system that will take care of my ever expanding storage needs for a long time.
Currently using both a PowerMac G5 and a MacBookPro. I want to be able to use the RAID with both systems, so will use software RAID instead of a controller. The G5 is on its way out and I'll eventually get a MacPro. Seems like the best solution is to use Port Multiplied SATA enclosures. This way I can use a Sonnet ExpressCard SATA dual SATA connector for the MacBookPro, and a PM SATA PCI card in the tower.
For the enclosure I'll use a PROAVIO EB8PM. This is an eight bay enclosure with 2 Port Multiplied SATA ports. Yes, it is big but the PROAVIO enclosures are built for in-studio operation and are very very quiet.
For my images, I'll make a four disk RAID, either striping 2 sets of 2 disks together and then mirroring both pairs, or the other way around, mirroring 2 sets of 2 disks and then striping them together. Need to find out which is the best option. This way I'll get very fast I/O and safety for my images, which will all be referenced. May use Seagate 750GB, which I have a few of already, or maybe splurge and get some of the new 1TB drives. This will give me 1.5 or 2 TB, which should allow me to forget about running out of space for at least a couple of years!!!
For the Aperture library, I'll make another RAID 0 (striped for safety and slight speed increase). This 2nd RAID will also house my other data (music, movies, personal, etc.)
A large single drive will be the backup target for the both the Images and the Library, using Retrospect. Eventually will have two drives so I can store one off site, and rotate them from time to time. This will leave me with one bay free, which might come in handy.
As the images will be referenced, the Aperture library will be more compact. This way if I am going to be on the road, I can copy the library to the MacBookPro's internal drive, and copy over any referenced images I might need. When I get back from traveling, the Library goes back to the small RAID, any new images get put into the large RAID and I'm back in action.
This is a huge investment but I feel it is necessary to handle the tidal wave of shooting RAW, plus the need for removing disk I/O as a bottleneck in the Aperture chain.
I have not used referenced images before, so I hope I am not opening myself up to other issues with this strategy. But keeping everything in the library will make it impossible to copy it to the MacBookPro, so I guess I don't have a choice.
I'm about to take the plunge so your comments are most welcome!
thanks...

Thanks for your comments...
re: 1) Striping (RAID 0) makes it more likely you'll loose data, as only one drive needs to die and all data is gone. Mirroring is good for a drive where you'll be changing data often, but if it's just an archive drive is kind of a waste (wasn't quite sure where you were keeping what in all the mixes of striped and mirrored sets)
The idea for the IMAGES is to to combine stripe (RAID 0) for speed and mirror (RAID 1) for safety into a RAID 0+1. The LIBRARY would be on the RAID with just RAID 1 (mirrored).
re: 2) I would have the library itself on a RAID that is mirrored so that your changes are being backed up real time.
Yes, that is my plan. I made a mistake in my original post. For the Library I meant RAID 1 for safety, not RAID 0.
re: 5) The copying of the Aperture library sounds interesting, but another plan would be to just copy over projects you want.
Yes, I thought about that, but I like the idea of keeping my entire library with previews with me. Also exporting different projects can get tricky. Which ones did I export? Which ones did I make changes to? etc. Keeping the Library intact seems like a good way to prevent user error...
re: 6) Nothing is wrong with referenced copies, it just makes having a good backup strategy a lot more important, and you can't rely on Vault to backup masters (but then you were using Retrospect so that sounds fine)
Frankly, I never liked the Vault. It seems like a good concept, but is unweildly. Retrospect, despite not having been updated for a very long time is fast and accurate and restoring a single accidentaly deleted image is snap.
By the way, I posted a message about using Software RAID in the Xserve RAID forum if anyone is interested:
http://discussions.apple.com/thread.jspa?messageID=5456086#5456086
matthew

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