[mrtg] Re: Summing multiple targets

M.E. m.eldesoky at tedata.net
Thu Apr 3 10:31:07 MEST 2003

On Thursday 03 April 2003 10:21 am, Peter Glanville wrote:
> >I use the option unknaszero in mrtg cfg file.
> >I don't know if MRTG has any limits on the number of targets to be summed
> !!
> >I have more than 50 targets.
> >Anyone tried doing something like that ???
> >
> >Regards
> >M. Eldesoky
> In my experience, Target A+B returns nothing if ANY of the interfaces fails
> to reply. If you are adding a lot together, there's a good chance that at
> least one will fail. The only solution would be to up the retry counts etc,
> but then you might not get around the lot within the polling interval.
> Another way of summing, is to use MRTG/RRD to capture and store the data,
> and Routers2.cgi to view it. Routers2 has a Totalling option, so monitor
> lots of interfaces individually (if one skips, who cares?), and plot a
> total graph. Works for 2 or 3 interfaces, never tried it with your
> quantities.
> Peter

Thanks alot Peter
As I said, I use Cacti as my frontend, and it is configured to graph all of 
our interfaces, so I don't have the option to change my frontend now.
Also, I used unknaszer in my cfg, I guess it will make the NaN as Zero, hence 
overcoming the NaN phenomenon ( I wish, but it seems not to work !!)

Now let the question be, what NaN do exactly, when using RRD with MRTG ???

Mohamed Eldesoky

Person who say it cannot be done should not interrupt person doing it.  
--Chinese Proverb 

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