[mrtg] MRTG question

[Maria Sanchez]

Hi all,
 I am new in using mrtg and rrdtools....  I am using mrtg to graph 
traffic information in our network. Traffic information is stored in an 
Oracle database.

The approach taken is the following:

1) There is a program that runs every minute and gets the latets traffic 
values (these are like counters).   These values are stored in a file 
that mrtg will read.
2) mrtg is configure to run every minute to read those values (please 
see configuration file below).
    mrtg is configured to create the rrd file only, we later use the 
rrdtool to graph the data.

the information bellow lists the values we get from the file (read from 
mrtg using the debug.sh script) and the values stored in the rrdfile. 
They do not match, and I am not able to find any pattern to it.... Can 
somebody explain to me how mrtg ends with these values in the rrd file?.

Thank,
    Maria


mrtg config file is (showing only target of interest, there are more 
targets):

=====
### Global Config Options

WorkDir:/opt/stm/5.40.6/output
RunAsDaemon:Yes
Forks: 8
Interval:1
LogFormat: rrdtool
LibAdd: /opt/rrdtool/lib/perl/5.8.8/sun4-solaris
PathAdd: /opt/rrdtool/bin


Target[sts1st4_agw1-chain1-IDU1]: `/var/tmp/debug.sh`
MaxBytes[sts1st4_agw1-chain1-IDU1]: 17179869180
Title[sts1st4_agw1-chain1-IDU1]: sts1st4_agw1 to IDU1 throughput
Options[sts1st4_agw1-chain1-IDU1]: growright,  nopercent, integer, 
unknaszero, derive
Legend1[sts1st4_agw1-chain1-IDU1]: Bytes send
Legend2[sts1st4_agw1-chain1-IDU1]: Bytes received


=====

Originally we did not have the derive option, and the values were as 
confusing as these ones but different.

What it is not clear is how is this data is stored in rrd files.

/
/
This is the data we collect:
Each set indicates the time when mrtg read the
file and the values in the file
/




Fri Jan 11 18:41:31 UTC 2008/
0
0
0
28
==
/Fri Jan 11 18:42:29 UTC 2008/
20000
20000
0
28
==
/Fri Jan 11 18:43:28 UTC 2008/
80000
80000
0
28
==
/Fri Jan 11 18:44:28 UTC 2008/
80000
80000
0
28
==
/Fri Jan 11 18:45:29 UTC 2008/
240000
240000
0
28
==
/Fri Jan 11 18:46:29 UTC 2008/
320000
320000
0
28
==
/Fri Jan 11 18:47:28 UTC 2008/
400000
400000
0
28
==
/Fri Jan 11 18:48:28 UTC 2008/
480000
480000
0
28
==
/Fri Jan 11 18:49:28 UTC 2008/
480000
480000
0
28
==
/Fri Jan 11 18:50:28 UTC 200/8
640000
640000
0
28
==
/Fri Jan 11 18:51:29 UTC 2008/
720000
720000
0
28
==
/Fri Jan 11 18:52:28 UTC 2008/
800000
800000
0
28
==
/Fri Jan 11 18:53:27 UTC 2008/
880000
880000
0
28
==
/Fri Jan 11 18:54:27 UTC 2008/
960000
960000
0
28
==
/Fri Jan 11 18:55:29 UTC 2008/
960000
960000
0
28
==
/Fri Jan 11 18:56:29 UTC 2008/
1120000
1120000
0
28
==
/Fri Jan 11 18:57:28 UTC 2008/
1200000
1200000
0
28
==/
Fri Jan 11 18:58:27 UTC 2008/
1280000
1280000
0
28
==
/Fri Jan 11 18:59:28 UTC 2008/
1360000
1360000
0
28
==
/Fri Jan 11 19:00:29 UTC 2008/
1360000
1360000
0
28
==
/Fri Jan 11 19:01:30 UTC 2008/
1520000
1520000
0
28

	The content of the .rrd file which I read using command:

/opt/rrdtool/bin/rrdtool fetch sts1st4_agw1-chain1-idu1.rrd AVERAGE
returns the following values:

1200076620: NaN NaN
1200076680: NaN NaN
1200076740: NaN NaN
1200076800: NaN NaN
1200076860: 0.0000000000e+00 0.0000000000e+00
1200076920: 1.6666666667e+02 1.6666666667e+02
1200076980: 6.9209039548e+02 6.9209039548e+02
1200077040: 4.7457627119e+02 4.7457627119e+02
1200077100: 1.3989071038e+03 1.3989071038e+03
1200077160: 1.9453551913e+03 1.9453551913e+03
1200077220: 1.3453928773e+03 1.3453928773e+03
1200077280: 1.3547892720e+03 1.3547892720e+03
1200077340: 6.2222222222e+02 6.2222222222e+02
1200077400: 1.4222222222e+03 1.4222222222e+03
1200077460: 1.9438979964e+03 1.9438979964e+03
1200077520: 1.3344447532e+03 1.3344447532e+03
1200077580: 1.3559322034e+03 1.3559322034e+03
1200077640: 1.3435028249e+03 1.3435028249e+03
1200077700: 6.0000000000e+02 6.0000000000e+02
1200077760: 1.3777777778e+03 1.3777777778e+03
1200077820: 1.9894538606e+03 1.9894538606e+03
1200077880: 1.3559322034e+03 1.3559322034e+03
1200077940: 1.3314809669e+03 1.3314809669e+03
1200078000: 6.1202185792e+02 6.1202185792e+02
1200078060: 1.3551912568e+03 1.3551912568e+03
1200078120: 1.9894415115e+03 1.9894415115e+03
1200078180: NaN NaN

/
/

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