[xymon] Question about trend graph scaling

[Steve Holmes]

It's because at longer history the values are averaged over longer time
intervals.
Steve

On Tue, Oct 26, 2010 at 3:07 PM, Lee, Raymond <Raymond.Lee at qwest.com> wrote:

>  Hi all,
>
> When I go to the trend page for a host and then click on a graph to get the
> 48-hr, 12-day, 48-day, and 576-day graphs, something doesn't look right.
>
> For example, I'm looking at the CPU utilization graphs:
> * In the 48-hour graph, I see 2 spikes for "user" this morning that were
> near 60%.
> * In the 12-day graph, those same 2 spikes only go up to about 30%.
> * In the 48-day graph, the spikes only go up to about 15%.
> * In the 576-day graph, the values hover around 10%.
>
> Furthermore, the legend at the bottom of the graphs shows max values that
> are lower than what can be seen on the graphs.  I'm seeing the same behavior
> on the other graphs from the trend page...not just the CPU Utilization
> graphs.
>
> Is there a problem with the scaling of the y-axis between the graphs over
> the various timeframes, or am I not understanding the way that RRDTool
> generates these graphs?  I did notice that if I zoom in from one of the
> higher level graphs to match a more granular graph, I get the same numbers
> that I expect in the more granular graph.  For example, in my example
> above, if I go to the 12-day graph with spikes at 30% and zoom in to just
> the last 48 hours, the graph looks the same as the 48-hour graph with the
> spikes at 60%.
>
> Thanks,
> Ray
>
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