[xymon] Question about trend graph scaling

[Henrik Størner]

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.


Regards,
Henrik