Hello all, I'm looking to add RAID-5 in my Mac Pro. I know it's not possible from software. Running OS X 10.6.8, 17GB RAM. I want to use 4x Hitachi Ultrastar 1TB drives in a RAID-5 config (tradeoff with capacity and redundancy). I am thinking of installing an adapter for the second optical bay to use 2x 2.5" SATA drives and booting from there using the 2 unused SATA ports on the mainboard. Most likely SSD, one for OS X Boot, the other for Windows 7 x64 dual boot. I don't need much capacity for my Windows use anyway, only a couple of games that are not OS X native, Battlefield 3 and Metro 2033 currently. I have experience with hardware RAID in the non-OS X world, Linux, WIndows, etc. but RAID support in OS X is more limited from what I gather. My normal "go to" manufacturer is LSI and second, Adaptec. I understand LSI has recently made inroads in OS X RAID, and Adaptec still not although I could be wrong on this. Seems like 3 companies are the primary choices for OS X hardware RAID, ATTO, Areca, and HighPoint. I'd prefer to stay away from HighPoint as from what I understand they don't actually manufacture the RAID chips, they merely put them on their PCB. Unless someone has a better idea I'm trying to decide between ATTO and Areca. I have seen the ATTO ExpressSAS R348 which can be configured in either 4/4 or 0/8. I'd be interested in the 4/4 config (obviously). I'm leaning towards the 8 port model so that I can in the future (whether in this Mac or a newer Mac Pro) add an external SAS enclosure and continue to expand my storage without replacing the RAID card or adding another one. Any ideas, suggestions? Has anyone had experience with the R348 or similar? As I've stated, I have RAID experience in the non-OS X world, but thus far only software RAID for OS X. While I have had no issues with the RAID-0 stripe in OS X, I don't wish to trust 4x1TB drives to RAID-O, nor do I want to lose half the capacity. I already understand the cons of RAID-5, mainly slower write speeds, but I believe that spread across 4x drives, the write speeds will still be more than sufficient for my uses. My primary usage is heavy virtualization (and when time permits, gaming). I do not do video editing, capture, etc. I DO however run in excess of 8 VMs at once though. Thanks in advance for any suggestions!