[mrtg] Re: Moving from MRTG to RRD - Windoze

Steve Shipway s.shipway at auckland.ac.nz
Wed Mar 10 20:46:38 MET 2004

>I discovered this when playing with the Killspike.pl
>It writes the RRD to an output file, removes spikes (eg caused 
>by router 
>reboot) and reads the file back into the RRD. The problem comes as it 
>writes back to the RRD, you get some ridiculously high values, 
>some zero and even some negative!
>Use early executable RRD and it works fine.
Thankyou, you have just explained a really pernicious bug in the
routers2.cgi trending analysis module.  Since the trending analysis also
uses a similar method to generate a tempoary RRD file, it is being affected
by this -- I just could not work out how some people were getting this
behaviour (negative, and spiked results in the trending graph).  So, it
appears it is a bug in later versions of RRD for windows.

I wonder if Tobi knows about this?


Steve Shipway: ITSS, University of Auckland
Email: s.shipway at auckland.ac.nz  Web: http://www.steveshipway.org/  
** We can only discover new oceans when we have the **
** courage to lose sight of the shore.              **

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