-----Original Message-----
From: Henrik Størner [mailto:user-ce4a2c883f75@xymon.invalid]
Sent: Tuesday, October 26, 2010 4:14 PM
To: xymon at xymon.com
Subject: Re: [xymon] Question about trend graph scaling
In
<AANLkTi=UHCRZ=user-00d3dbaad4bf@xymon.invalid>
Steve Holmes <user-ec1bf77b1b44@xymon.invalid> 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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