Earlier quoted context omitted.
Cool. How do you get to 18TB RAID6? 8 3TB drives? 11 2TB? What hardware/OS are you using for that?
8 x 3TB in one of these: http://www.qnap.com/uk/index.php?lang=en-uk&sn=5050&c=2485&s... The NAS, whilst it is feature rich, I've disabled everything other then full-disk encryption. The only thing running on it is Squeezebox: http://oinkzwurgl.org/ssods_intro
Edit: I see that these Pro QNAP versions are actually high-specced and high-priced Intel machines. The HP microservers still hit a sweet spot of low price and ECC ram though. QNAP must be making a bundle by effectively differentiating themselves in their software. Nothing in the hardware seems to justify the pricing.