[xymon] Question about trend graph scaling

Lee, Raymond Raymond.Lee at qwest.com
Tue Oct 26 22:33:04 CEST 2010



> -----Original Message-----
> From: Henrik Størner [mailto:henrik at hswn.dk]
> Sent: Tuesday, October 26, 2010 4:14 PM
> To: xymon at xymon.com
> Subject: Re: [xymon] Question about trend graph scaling
>
> In
> <AANLkTi=UHCRZ=zYJWktNTCdMbTonh92W5NvL2JNzgpF2 at mail.gmail.com>
>  Steve Holmes <sholmes42 at mac.com> writes:
>
> >> > It's because at longer history the values are averaged
> over longer time
> >> intervals.
> >>
> >> It would seem that is what is happening, but is that
> appropriate for things
> >> like CPU values?  100% of the CPU is constant over time.
> And it looks like
> >> when he takes a certain path to zoom in, he sees expected values.
>
>
> When you look at a graph, rrdtool will automatically decide
> which of the
> 4 datasets it is going to use - the 48-hour set, the 12-day set etc. -
> based on what timeperiod you are looking at. So if you start with the
> 12-day set but zoom into a period within the past 48-hours, then it
> will automatically switch from using the 12-day averaged set to the
> higher-precision 48-hour set - that's why you then see the peak just
> like you do on the 48-hour graph.
>
> Wait a couple of days, and when you zoom in on the same peak, it
> won't be as high as it was today.

Ah, so the different graphs are averaged over time.  I was confused because there are min., max., and avg. values in the legend for the CPU Util. graphs.  So I guess the avg. there is really an average of averages.  Thanks everyone!

Ray

>
>
> Regards,
> Henrik
>
>
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