[rrd-users] Re: traffic peak

[Diaz Freire, Alberto]

	Hello Alex, Thanks to respond.
	 I have looked for your articles
	
http://groups.google.com/groups?q=alex+rrdtool+derive+negative&hl=es&lr=&ie=
UTF-8&selm=b8706d%242ccg%241%40FreeBSD.csie.NCTU.edu.tw&rnum=1
	
http://groups.google.com/groups?q=alex+rrdtool+derive+negative&hl=es&lr=&ie=
UTF-8&selm=9lmq9j%24243g%241%40FreeBSD.csie.NCTU.edu.tw&rnum=2
	and I have read your documentation 
		http://www.rrdtool.com/tutorial/rrdtutorial.html
		
	but still I do not know like solving my problem.
	I am using MRTG with RRDTOOL, I specify it in the mrtg configuration
file.
		LogFormat: rrdtool
		PathAdd: /app/mrtg/rrdtool/bin
		LibAdd: /app/mrtg/rrdtool/lib/perl                  
	
	 I am using RDDCGI
			<RRD::GRAPH
/app/iplanet/servers/docs/estadisticas/mrtg/demoing/24horas.gif
	           	--start -86400 --vertical-label "Bytes por segundo"
	           	 --imginfo '<IMG SRC=/mrtg/demoing/%s WIDTH=%lu
HEIGHT=%lu >'
	           	 DEF:entrada=demoing.rrd:ds0:AVERAGE
			......
		I do not know where and how I can use DERIVE and I wouldn't
like to create a new data base .rrd because it would lose all data of months

	somebody can help me 
	Greetings and thank you very much.


> -----Mensaje original-----
> De:	Alex van den Bogaerdt [SMTP:alex at ergens.op.het.net]
> Enviado el:	martes 27 de mayo de 2003 00:33
> Para:	'rrd-users at list.ee.ethz.ch'
> Asunto:	[rrd-users] Re: traffic peak
> 
> On Mon, May 26, 2003 at 07:39:55PM +0200, Diaz Freire, Alberto wrote:
> 
> > 	hi,
> > 	 I have the following problem, 
> > 	When a shutdown in the router takes place, mrtg and rrdtool takes
> > very high values and it distorts the graphs because a traffic peak is
> show. 
> 
> Actually this peak occurs when the router starts up again.
> Its counters will be reset, rrdtool finds that the value is
> smaller than last time and will assume a counter wrap has
> occured.
> 
> > 	How i can avoid this behavior ? 
> 
> Search the archives for words like DERIVE, negative, peak.
> I know I posted something not so long ago, adding my name
> to the query might help.
> 
> cheers,
> Alex
> 
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