Hi Ahmad -
excellent post, excellent question. I am surprised that you did not bother to list the manufacturers of these products, as most people would find these numbers obscure !
The iT8 and the CineRaid chassis are made by the same company. Both are excellent products. At NAB, NO ONE demonstrated these products working. The ARC-1883x was demonstrated USING A PC (not a Mac) at the Sans Digital booth, showing about 3500 MB/sec with 6g drives in a 24 bay drive enclosure (RAID 0, not RAID 5). CineRaid did not demonstrate the speed of the product.
I just got an ARC-1883x and it is NOT faster than the ARC-1882x in a Mac Pro with a 6g SAS expander from Areca. I am promised that with the new 12G SAS expander from Areca, that it will be faster on the Mac, but I don't have one yet, so I cannot test it (but I will - I promise - and it might even be this week). So both CI and CineRaid simply don't have the 12G expander yet for the chassis that you are mentioning - it's too early, and too new. Be patient, and these products will all have the 12G SAS expander that will match the ARC-1883x.
Will it work better on the PC - yes. Will it work better on the Mac - I don't know - I will find out. Both the iT8 and the CineRaid are excellent products, made by the same company.
Sorry i could not follow the thread because i was really busy at work.
I have sent an email to CineRaid before i post this message here and i got absolutely no answer, and to be honest this makes me really worried about getting a product from a company that does not answer their emails.
Did u get the 12G expander yet? Did you try it on MacPro ?
Why your not sure that it would work on Mac ?
what would be the speed of 12G ? if the best 6G SAS would deliver around 650MB read and write, what would a 12G deliver? and i hope you were talking about the SAS not the Thunderbolt.
I'm trying to find the best solution away from Thunderbolt because i own a MacPro5,1.
I'll be glad if you can advice me on this subject.