Concern

Dave Gilbert was kind enough to add a new chart renderer for JFreeChart, which can render (e.g.) the deviation from the mean in a dense data set elegantly, without crowding the graph with error bars.

(This is a great example of open source software at work: someone has an idea, someone knows how to do it simply, and the result benefits a whole community)

I’m using this for a project I’m working on related to Ceph, a petascale storage system being developed here at UCSC. Ceph is a pretty interesting project in its own right; it’s free software, too. Systems like Ceph seem, to me, like the only real way that storage systems will truly scale and remain high-performance in the near future, if we keep using disk drives for storage, since capacity increases are still going to outpace disk latencies and reliability.