[mrtg] Re: [rrd-users] Re: data Spikes?

[Shipley, Rob]

If you have maxbytes set in MRTG for the target, and the traffic exceeds it,
it will put a NaN(unknown value) in the database. I haven't seen how you use
rrdtool, but if you don't setup a max on your collections, it will not set
it to NaN, it will actually graph the spike. A way to tell the difference is
to do a rrdtool dump on both rrd files - the one you create & the one MRTG
creates. See if a max is set for both the ds. My guess is MRTG rrd files
have it and your customized rrd files don't. Honestly, you actually may have
spikes in traffic on your network!  I set Absmax in MRTG a little higher
than maxbytes to collect them.

-----Original Message-----
From: steve [mailto:spham at qwest.net]
Sent: Monday, May 20, 2002 10:04 PM
To: 'Marc Bilodeau'; mrtg at list.ee.ethz.ch; 'RRD users'
Subject: [rrd-users] Re: [mrtg] data Spikes?



Marc,

I had a similar experience. 

I also setup rrd and mrtg to monitor the same devices and compare the
two.
I hope someone out there may have an answer for us.


Steve


-----Original Message-----
From: mrtg-bounce at list.ee.ethz.ch [mailto:mrtg-bounce at list.ee.ethz.ch]
On Behalf Of Marc Bilodeau
Sent: Monday, May 20, 2002 11:03 AM
To: mrtg at list.ee.ethz.ch; 'RRD users'
Subject: [mrtg] data Spikes?


All,

Recently we noticed RRD have some strange spikes in the graphs we
generated. After running around, we determined that our network was not
the issue. In order to prove our theory we set up MRTG and RRD on two
different boxes monitoring the same devices. In the end, RRD displayed
spikes in the data the MRTG did not. Is this an RRD issue? Is there a
solution? Does anyone know why this happens in RRD and not MRTG?

Thanks in advance,
Marc


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