My main problem with the DS380, however, is the low cooling performance. There are some whitepapers from Google about longevity of consumer hard drives that state that failure rates rise by an order of magnitude if the HDD operates above 40C.
Actually no, in Google's hard drive study (http://research.google.com/archive/disk_failures.pdf
), the most reliable temperature range was from 35C to around 45C. Failure rate does become higher by 1% ~ 2% up to around 50C but it's still much better than if the drives were kept cool. You can see clearly from the graph below that drive failure rate raise by an order of magnitude if temperature goes below 25C. There is really no need to keep HDD cool, running them at warm temperature appears to be the best!