[rrd-users] Graphing integer data in Cacti/RRDTool

Nick Ellson grimm at nickellson.com
Thu Jun 12 15:59:38 CEST 2008


I am sorry if I did miss your meaning previously. I am having trouble 
understanding where, between Cacti & RRDTool, I might obtain a graph 
similar to the artifact I was getting through MRTG graphing non-network 
throughput. ;)  I can take this to the Cacti forums, maybe there are 
alternatives for displaying the data for specific graph types.

As to the "what would I want to se"e should I have a gap in my data? I 
actually liked the switch in MRTG that held the previous value, or showed 
zero for that period. I used a little of both behaviors.

Thanks again for helping understand why I was seeing the difference, Tobi! 


Nick Ellson
CCIE# 20018
MCSE 2000, Security+, Network+
Network Hobbyist, VFR Private Pilot.

On Thu, 12 Jun 2008, Tobias Oetiker wrote:

> Nick,
> Today Nick Ellson wrote:
>> Hi Tobi!
>> In this case, with the # of users logged in, I'd like it to display the
>> sampling that it has for the 12:00 instant. Then the 12:05 instant for the
>> 12:05-12:10 window.
>> So ultimately perhaps I need Cacti's poller to assist in keeping the data
>> collection times consistant over the 5 min polling intervals, yet tell RRDTool
>> that the data set it is dealing with is integer in nature.
>> And from what I read, there seems to a a small handful of data sets folks are
>> graphing that fit this model (where an interpolation with a decimal answer
>> make no sense).
> hmmm what I tried to tell you is, that it DOES make sense, or what
> should it display in a graph where you see one value for a whole
> day ?
>> How would you describe the behavior that MRTG without RRD behaved in this
>> matter? As it did produce the squarewave like graphs I felt did a great job of
>> representing interger gauges such as this.
> mrtg was designed with network traffic in minde, kilo, mega giga
> bytes, decimals did not seem to matter in this context. So what you
> are seeing is a artifact due to a 'miss-use' of mrtg :-)
> cheers
> tobi
> -- 
> Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten
> http://it.oetiker.ch tobi at oetiker.ch ++41 62 213 9902

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