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

[Marc Bilodeau]

Rob,

I agree. However, if the spike never hits the max value then it will not
be recorded as a NaN. Our average load on a port may be only 20 - 30K.
However, out of no where it would spike to 10 or 15mb randomly at all
hours of the day on a 100mb port complete hiding the existing data. We
have a fairly large implementation and it happens on all types of
devices too at random times with no consistency. We confirmed it was not
our network because we were using other products monitoring the same
MIBs. I'm stumped. The only thing I can think of is it may be a counter
wrapping issue.

Marc

-----Original Message-----
From: mrtg-bounce at list.ee.ethz.ch [mailto:mrtg-bounce at list.ee.ethz.ch]
On Behalf Of Shipley, Rob
Sent: Wednesday, May 22, 2002 12:17 PM
To: 'steve'; 'marc at somix.com'; 'mrtg at list.ee.ethz.ch'
Subject: [mrtg] Re: [rrd-users] Re: data Spikes?


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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