Mike Gerdts wrote: > > A key problem with rrdtool is that it doesn't store the actual values > that you feed it - rather it weights the values given to the intervals > you specify. Suppose the most detailed portion of the rrd file is 1 > minute intervals and the following values are recorded: > > MM:SS Value > 00:15 100 > 01:15 50 > > The value stored in the rrd file at 01:00 will be something like 62.5 > (15/60 * 100 + 45/60 * 50). I may be off on the exact algorithm, but > just beware that data in doesn't look just like data out. It is, > however, quite sufficient for visualization and maybe some other > analysis.
Hmm. I don't like that. I want to see the exact values as they were originally measured. I don't like seeing massaged data at all. If it needs massaging for some reason, let me do it and I can justify my methods to management. > Do take a look at Brendan Gregg's blog and get to understand the > graphs there. Heat maps are a wonderful thing. I'd love to see this > as a standard graph option in rrdtool (and R, and ...). Thanks, I will. :-) Rainer -- Mind the Gap http://www.dragonhearth.com/blogs/rheilke
