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 _______________________________________________ sysadmin-discuss mailing list sysadmin-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/sysadmin-discuss
