Actual capacity of the 4 hdd bays with/without raid...

I've seen a few discussions regarding the capacity of the Mac Pro and it's 4 HDDs. I will be buying one shortly and have a few questions regarding this.
1) It seems clear that from other discussions, the Mac Pro can detect and operate a 3TB drive without a hardware raid card, however with the hardware raid card, it's limited to 2.2TB. I would assume then that you can easily detect and raid (0/1/5) a 3TB array...could I get any verification on this?
2) On a related note, is the currently advertised 8TB total capacity real? For instance, if these users are finding that each bay can view and utilize a 3TB drive (as opposed to the advertised 2TB), would it then be realistic to assume that you would be able to view and utilize a 12TB (4x3TB) total capacity? Perhaps even raid 5 it via osx software raid 5?
3) Does anyone forsee any performance issues running this on an 8-core 3.2 processor Mac Pro? I'd upgrade to those specs for this purpose.
Thanks a ton for the thoughts!

the Mac Pro can detect and operate a 3TB drive without a hardware raid card
Yes.
I would assume then that you can easily detect and raid (0/1/5) a 3TB array
That is correct.
is the currently advertised 8TB total capacity real?
No. That only has relation to what Apple sells, not what can actually be used.
would it then be realistic to assume that you would be able to view and utilize a 12TB (4x3TB) total capacity?
Yes.
Perhaps even raid 5 it via osx software raid 5?
If you are serious about RAID, you will rethink the use of OS X software RAID.
There are better softwares:
http://www.softraid.com/
In talking a RAID 5 or 6, a hardware RAID may be more appropriate, especially due to the limitation of the number of drive bays available.
Yes, 3 is minimum, 4 is better, and the same said for 5 drives; better yet.
This is what Apple states as supported using the Apple RAID card:
http://support.apple.com/kb/TA24883
Don't limit thinking to that card, though.
There are faster.
And think external.
Stuff 4-5 drives in a PM enclosure and connect to a third party card.
More drives is better in a RAID 5:
http://www.adaptec.com/blog/2007/07/10/effect-of-drive-count-on-raid-5/
Some thoughts:
http://macperformanceguide.com/Storage-RAID5.html
http://www.barefeats.com/hard120.html

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