[mrtg] Re: Summing multiple targets

[M.E.]

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 ???

Regards
Mohamed Eldesoky


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

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