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RE: [xymon] Question about trend graph scaling
- To: "'xymon (at) xymon.com'" <xymon (at) xymon.com>
- Subject: RE: [xymon] Question about trend graph scaling
- From: "Lee, Raymond" <Raymond.Lee (at) qwest.com>
- Date: Tue, 26 Oct 2010 15:33:04 -0500
- Accept-language: en-US
- Acceptlanguage: en-US
- References: <BC6FF8D396D71F49A12774CD995980813E8E3E (at) pcsexch.phillycarshare.loc> <41EE66689DFD3647AAE8E8CB28C2668B84C4F30767 (at) qtomaexmbm21.AD.QINTRA.COM> <AANLkTimXtO0tv=-wC_SV2jRJsLyNAQSgOs+gUkh5U9dp (at) mail.gmail.com> <BC6FF8D396D71F49A12774CD995980813E8E3E (at) pcsexch.phillycarshare.loc> <AANLkTi=UHCRZ=zYJWktNTCdMbTonh92W5NvL2JNzgpF2 (at) mail.gmail.com> <ia7cqk$ofu$1 (at) voodoo.hswn.dk>
- Thread-index: Act1SrLWMow4atYIRWO6Oxumy+25cgAAeZHQ
- Thread-topic: [xymon] Question about trend graph scaling
> -----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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