File System Latency: part 4

Part 1: <a href="http://news.ycombinator.com/item?id=2539268" rel="nofollow">http://news.ycombinator.com/item?id=2539268</a><p>Part 2: <a href="http://news.ycombinator.com/item?id=2560682" rel="nofollow">http://news.ycombinator.com/item?id=2560682</a><p>Part 3: <a href="http://news.ycombinator.com/item?id=2560684" rel="nofollow">http://news.ycombinator.com/item?id=2560684</a>