[mrtg] Re: Target addition problems

[Fruitman, Corey]

It's possible that one or both of the targets are passing so much traffic that they're rolling the counters over within the polling interval.  You should check your MaxBytes value (in the RRD and the MRTG config) and verify that it's not being exceeded by adding the two targets together.

I'm not sure how RRDTool knows if you're using a 64- or 32-bit counter (to determine the rollover), but if you're not polling using SNMPv2, you probably should be.  

Hope that helps,
Corey.

-----Original Message-----
From: Stephen May [mailto:stephen.may at sms-internet.net]
Sent: September 4, 2003 12:24 PM
To: mrtg at list.ee.ethz.ch
Subject: [mrtg] Target addition problems


Hi, we're using MRTG/RRD to graph our routers and switches, and I'm having a
problem adding two targets together to get our total internet usage.  The
two individual targets (Gigabit ethernet ports) both work OK, but as soon as
I try and add them, it all goes haywire.  The total for them never gets
above ~70Mb, but one of the ports on its own is passing around 175Mb of
data!  The graph generated is very jaggy and spikey, and I can't figure out
what the problem is.  Has anyone got any pointers?

Regards

Stephen May

SM1214-RIPE
Systems Administrator
Satellite Media Services
Lawford Heath Earth Station, Lawford Heath, Rugby CV23 9EU, United Kingdom

t  +44 1788 523000
f  +44 1788 523001
e  mailto:stephen.may at sms-internet.net
w  www.sms-internet.net

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