Re: [Observium] Differing values

4 Jul 2014

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-----Original Message-----
From: observium [mailto:observium-bounces@observium.org] On Behalf Of
Tom Laermans
Sent: 04 July 2014 15:10
To: Observium Network Observation System
Subject: Re: [Observium] Differing values
Hi Emma,
We send the same command to rrdtool for both graphs (apart from
height/wIdth).
Obviously if a poll happened after the page was loaded but before you
hovered, data will differ.
But I know that's not what you mean, after all that's a 5 minute window
where in that theory the graphs should be equal.
I -think- RRDtool may base its data also on averages which are calculated wrt
the time difference between the last poll and the current time (meaning that
every second up to the next poll time may give you other data points if it
needs to average out). But that may very well be total BS.
Long story short, no idea, but we're not drawing the graphs ourselves;
maybe the rrdtool guys know more.
Tom
Thanks Tom, we're were just concerned that when we open out our Observium to departmental IT admins that we'll get people querying the validity of the data, so for the moment I've disabled the mouse-over graphs...
Emma
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On 07/04/2014 04:03 PM, Cardinal-Richards, Emma wrote:
	On 25 Jun 2014, at 20:35, Adam Armstrong

adama@memetic.org mailto:adama@memetic.org  wrote:
		On 2014-06-24 05:25, Cardinal-Richards,

Emma wrote:
   			Hi,
   			On (seemingly all) our device port pages I get
different values in the
   			legends on the page of graphs vs their
respective hover over pop-up
   			graphs? In theory I thought they're showing
the same timeframe/data?
	RRD gonna do what RRD gonna do!

	RRD generates the legend based on the data it has

decided to use for the
graph. This depends on the time period and the resolution of

the data. None
   	of our code is involved in any of this.
	Note that without a screenshot, no one knows what

you're talking about,
and even fewer people are going to try to guess.

	adam.

I know you were anxiously awaiting this....
I've attached a screenshot as an example, the popup graph is of the
3rd graph along.  The numerical values differ, this seems to be the same on
the majority of graphs not just 'traffic', and not for all values (some match).
Emma

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