MRTG-LOGFILE(1)                      mrtg                      MRTG-LOGFILE(1)



NNAAMMEE
       mrtg-logfile - description of the mrtg-2 logfile format

SSYYNNOOPPSSIISS
       This document provides a description of the contents of the mrtg-2 log-
       file.

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       The logfile consists of two main sections.

       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 increassing inter-
           vals.

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

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       TThhee ffiirrsstt LLiinnee

       The first line has 3 numbers which are:

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

       B (2nd column)
           The "incoming bytes counter" value.

       C (3rd column)
           The "outgoing bytes counter" value.

       TThhee rreesstt ooff tthhee FFiillee

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

       A (1st column)
           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 OpenOffice Calc or MS Excel by
           using the following formula

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

           (instead of ";" it may be that you have to use "," this depends on
           the context and your locale settings)

           you can also ask perl to help by typing

            perl -e 'print scalar localtime(x),"\n"'

           xx is the unix timestamp and yy is the offset in seconds from UTC.
           (Perl knows yy).

       B (2nd column)
           The average incoming transfer rate in bytes per second. This is
           valid for the time between the A value of the current line and the
           A value of the previous line.

       C (3rd column)
           The average outgoing transfer rate in bytes per second since the
           previous measurement.

       D (4th column)
           The maximum incoming transfer rate in bytes per second for the cur-
           rent interval. This is calculated from all the updates which have
           occured in the current interval. If the current interval is 1 hour,
           and updates have occured every 5 minutes, it will be the biggest 5
           minute transfer rate seen during the hour.

       E (5th column)
           The maximum outgoing transfer rate in bytes per second for the cur-
           rent interval.

AAUUTTHHOORR
       Butch Kemper <kemper@bihs.net> and Tobias Oetiker <tobi@oetiker.ch>



2.15.2                            2007-04-29                   MRTG-LOGFILE(1)
