[mrtg] Re: Inconsistant graphs that seem to disagree with rrd data

Jim Mozley jim.mozley at exponential-e.com
Mon Jan 19 17:18:35 MET 2004

Daniel J McDonald wrote:

> there are two common problems you might be facing.  One is confusion
> between MB/s and Mb/s.  Make certain you are seeing bits everywhere
> instead of bytes.  As I recall, that was one of the things 14all wasn't
> terriblly good at, but that mrtg-rrd or routers2.cgi seemed to handle
> much better.

Thanks, the config does look OK and the results are OK for other interfaces.

> The second is that 115mb/s is pretty close to the rollover point for
> 32bit counters.  You should use 64 bit counters at those speeds.

The 64 bit counters are being used as these are gig-e interfaces.

I've checked the graphs again and all is now OK; the historical data 
from the period when we were testing is now showing correctly on the 
weekly graph. No changes have been made to the configuration. The only 
think I can think that was different to the norm was that the interfaces 
were passing a constant volume of data, rather than the usual varying 

I will have a look at using one of the alternative as you, Steve Shipway 
and Mohammed Ali have suggested. Although everything is now OK I don't 
want a repeat of this.

Thanks all for the help,


Unsubscribe mailto:mrtg-request at list.ee.ethz.ch?subject=unsubscribe
Archive     http://www.ee.ethz.ch/~slist/mrtg
FAQ         http://faq.mrtg.org    Homepage     http://www.mrtg.org
WebAdmin    http://www.ee.ethz.ch/~slist/lsg2.cgi

More information about the mrtg mailing list