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 <user-d4a5ab5607a1@xymon.invalid> 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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