[ixpmanager] Spikes on MRTG graphs

[Andrei Dinu]

Hello,

We also face these issues at Interlan IX. From time to time we normalize the data using https://github.com/mhagander/rrdclean <https://github.com/mhagander/rrdclean> . 

The tool analyzes the values inside the RRD database and you can select a cutoff point. All values above the cutoff point are modified to the value specified.

Hth,
--
Andrei DINU
Technical Manager
Digital IT Consulting
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> On 28 Mar 2020, at 14:53, <remy.guenter at swissix.ch> <remy.guenter at swissix.ch> wrote:
> 
> We face the same problem on the historical data for month and year:
> 
> https://ixpmanager.swissix.ch/statistics/ixp
> 
> To fix this we can not just simply change some text in a log file. For us
> this would mean - in my view - to dump the rrd datafiles (our installation
> does not write to log files), correct the values and then restore to rrd-db.
> 
> 
> That would require a script to find the "wrong" entries in the dumped XML,
> correct them (average of entry before/after) and write back the XML to be
> reloaded.
> 
> Is there a simpler procedure?
> 
> Rémy
> 
> -----Original Message-----
> From: ixpmanager <ixpmanager-bounces at inex.ie> On Behalf Of Nick Hilliard
> (INEX)
> Sent: Saturday, 28 March 2020 1:40 pm
> To: INEX IXP Manager Users Mailing List <ixpmanager at inex.ie>
> Subject: Re: [ixpmanager] Spikes on MRTG graphs
> 
> Barry O'Donovan wrote on 28/03/2020 10:38:
>> This is exactly as Martin suggests and also how we fix it too.
> 
> also, ixp manager puts in spike limits by counting up the total possible
> bandwidth of each individual graph.  E.g. the total possible bandwidth of
> the ixp would be the sum of all the edge ports, etc.  So there are checks in
> there already, but even still MRTG manages to mess things up from time to
> time.
> 
> Nick
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