[mrtg] Wrong Values

mikelowrey m.lowrey at gmx.net
Fri Feb 27 20:12:03 CET 2009

Freddie Cash (via Nabble) schrieb:
> On February 27, 2009 10:07 am mikelowrey wrote:
> > I installed MRTG last week as described in MRTG 2.16.2 Linux/Unix
> > Installation Guide.
> > Everything works fine - I get data from my cisco fc switches and I can
> > take a look of the statistics via browser.
> >
> > Today I compared the data from MRTG and the Fabric Manager Web client
> > (from Cisco) and the differences of the collected data are pretty huge
> > (up to 50%). In every case MRTG shows lower values.  The values are
> > updated in both cases every 5 minutes.
> Most SNMP counters are 32-bit, which means they have a max value of 
> around 4
> billion (packets, bytes, bits, whatever it's measuring).  5 minutes is a
> *very* long time, and the counters can easily wrap around several times
> during the time period.  Which can lead to very misleading results.
> Either shorten your polling period to around 60 seconds, or change your
> Target[] entries to use 64-bit counters (if they are available), or both.
> -- 
> Freddie
> fjwcash at ... 
> <http://n2.nabble.com/user/SendEmail.jtp?type=node&node=2397366&i=0>
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Thanks for your reply.

How can I find out if the 64bit counters are available and how can I 
change this Target entries?

Do I just need to change my crontab entry to every minute instead of 
every 5 minutes or do I need to change more?
Thanks and sorry for beginner questions.


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