RRDtool Tips and Tricks
I am having time-off today and found time to think about how I can determine the top 5 network throughput out of hundreds of RRD files. I stumbled upon this article: RRDtool Tips & Tricks. It is indeed a very useful paper and some of the tips mentioned helped me to summarise the data without having to do any programming. Look under the VDEF section.
The best tips are on page 2 and page 3:
Recipe for Success - Resolve the problems before anyone else finds them
... and talk about it - Being able is only half the story, the others must know too!