[mrtg] MRTG exact sampling interval
maelhady at eventumsolutions.com
Thu Dec 24 20:45:03 CET 2009
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.
MUSTAFA A. ABDEL HADY
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