logfile - description of the mrtg-2 logfile format


SYNOPSIS

       This document provides a description of the contents of
       the mrtg-2 logfile.


OVERVIEW

       The logfile consists of two main sections. A very short
       one at the beginning:

       The first Line
           It stores the traffic counters from the most recent
           run of mrtg

       The rest of the File
           Stores past traffic rate averates and maxima at incre­
           assing intervals

       The first number on each line is a unix time stamp. It
       represents the number of seconds since 1970.


DETAILS

       The first Line

       The first line has 3 numbers which are:

       A   A timestamp of when MRTG last ran for this interface.
           The timestamp is the number of non-skip seconds passed
           since the standard UNIX "epoch" of midnight on 1st of
           January 1970 GMT.

       B   The "incoming bytes counter" value.

       C   The "outgoing bytes counter" value.

       The rest of the File

       The second and remaining lines of the file 5 numbers which
       are:

       A   The Unix timestamp for the point in time the data on
           this line is relevant.  Note that the interval between
           timestamps increases as you prograss through the file.
           At first it is 5 minutes and at the end it is one day
           between two lines.

           This timestamp may be converted in EXCEL by using the
           following formula:

            =(x+y)/86400+DATE(1970,1,1)

           you can also ask perl to help by typing


           x is the unix timestamp and y is the offset in seconds
           from UTC. (Perl knows y).

       B   The average incoming transfer rate in bytes per second
           since the previous measurement.

       C   The average outgoing transfer rate in bytes per second
           since the previous measurement.

       D   The maximum incoming transfer rate in bytes per second
           since the previous measurement.

       E   The maximum outgoing transfer rate in bytes per second
           since the previous measurement.


AUTHOR

       Butch Kemper <kemper@bihs.net> and Tobias Oetiker
       <oetiker@ee.ethz.ch>


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