During my day-job quest to define what “cloud filesystem” might most usefully mean, I keep coming back to one statement:: cloud users need somewhere to store their data. Yes, I know that seems obvious. It’s so obvious that one can scarcely imagine anybody thinking otherwise . . . and yet such thinking (or perhaps lack of thinking) seems all too common among people involved in cloud computing. Here’s a little pie chart of how a lot of cloud folks seem to allocate their time spent thinking about the technical issues.