You should have a look at rrdcached. It basically is a writeback cache, with batching I/O. We took special care not to flush the cache too much, so the improve

You should have a look at rrdcached. It basically is a writeback cache, with batching I/O. We took special care not to flush the cache too much, so the improvements are very noticeable. Yet, it works only with on-demand graphing, of course.