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Calculations like 95th Percentile are particularly prone to this.
The second is more likely, and is caused when the wrong RRA is used to generate the graph.
If your RRD files do not contain a MAX CF RRA, then this is approximated by RRDTool at graph creation time using the available data.
I have manually calculated the MAX values from the RRD files and know that the total of a recent peak is 242,409.
Below is a screen capture of the one-minute sample in the graph which shows a matching total.
When you zoom out, RRDTool will move from using the 1pdp-AVG RRA to using the 5pdp-AVG RRA, and so you will actually be graphing the maximum 5min average rather than the maximum sample.
The same problem hit me a long time back with Routers2, and the solution was to explicitly use the MAX CF RRA in the RRDTool commandline -- RRD1.4 also allows you to enforce the 'reduce' method to be MAX and enforce the granularity where necessary to avoid this problem.
IIRC (it was a while ago now) I ended up drawing an invisible line for the max value so I could get it to use the right set of data to generate the subsequent max value for a gprint.
_______________________________________________ rrd-users mailing list [hidden email] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users Thanks to both Simon and Steve for their responses.
You can get Cacti to show you the command it used to draw a graph - useful for debugging.
Also be aware that I've had "issues" getting Cacti to use the correct def.