Date: Mon, 4 Aug 1997 10:56:02 -0500
From: Butch Kemper <kemper@bihs.net>
Subject: Re: README.logfile-format

This document provides a description of the contents of
the MRTG 2.X Logfile which contains about 2,530 lines:

     1.  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 0000 hours on 1/1/1970.

         B.  The "incoming bytes counter" value.

         C.  The "outgoing bytes counter" value.

     2.  The second and remaining lines have 5 numbers
         which are:

         A.  The Unix timestamp (1.A) when the data on
             this line was gathered.

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


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

             where x is the unix timestamp and y is the offset in seconds
             from UTC.

             For Europe: =(x+3600)/86400+DATE(1970,1,1)


         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.

     3.  The measurement lines are divided into 4 groups:

         A.  Lines 2 to ~600 are taken every 5 minutes and
             the D and E values are the same as B and C.

             These measurements cover a 50 hour period.

         B.  Lines ~600 to ~1200 are 30 minute averages created
             from 6 of the 5 minute measurements.  The D and
             E values are the maximums of B and C from
             the 6 measurements.

             These measurements cover a 300 hour or 12.5
             day period.

         C.  Lines ~1200 to ~1800 are 120 minute averages
             created from 4 of the 30 minute averages.  The
             D and E values are the maximums of B and C from
             the 4 measurements.

             These measurements cover a 1200 hour or 49 day
             period.

         D.  The remaining lines are 24 hour averages created
             from 12 of the 120 minute averages.  The D and E
             values are the maximums of B and C from the 12
             measurements.

             These measurements cover about 2 years.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Butch Kemper                         | Free sound advice available
Brazos Internet Consulting Group     | "95% sound and 5% advice"
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