[mrtg] MRTG exact sampling interval

Mustafa maelhady at eventumsolutions.com
Thu Dec 24 20:45:03 CET 2009

Dear all,

Please I have a question, in the MRTG .log files there are 5 columns:

1-       the first one is the time stamp in UTC 

2-      the second one is the average incoming transfer rate in bytes per
second. This is valid for the time between the UTC of the current line and
the UTC of the previous line

3-      the third column is same as the second but outgoing.

4-      The fourth column is the maximum incoming transfer rate in bytes per
second for the current interval. This is calculated from all the updates
which have occurred in the current interval.

5-      The fifth is the same as the fourth one but outgoing.

So that means that there is some sampling time that is less than the
specified interval in the "mrtg.cfg" file to be able to detect the maximum.
For example, I have adjusted the interval to be 5 minutes and I got values
in the .log file as the following:

1251871200      124890    463933    204720    497123

1251864000      124836    464014    188781    500925

1251856800      153102    478951    705564    892407

1251849600      129210    466166    185505    515786

As the second column is the average over 5 minutes, and the 4th column
values is much greater than maximum values, so my question is exactly: what
is the minimum interval that the MRTG can detect a certain maximum
throughput within it?

Thanks a lot for your patience and your support, I really appreciate that.

Best Regards,



Network Engineer



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