[mrtg] Re: Manually Editing Log Files

Scheidel, Greg Greg_Scheidel at ed.gov
Tue Dec 14 20:12:10 MET 1999

Ok, this explains how the first line is generated; it is the current count
on the interface as of the last reading, not a running tally maintained by

I've tried editing the log file manually, using the timestamps (converted in
a reference file to readable date/time values) to figure out where to place
the data.  I ran into problems when I ran MRTG with error messages about it
disregarding inconsistent data.  I was holding off on trying again until I
knew for certain that the first line of the log file wasn't the problem; I
will attempt this again and get the exact error messages if they come up

Thank you.

Greg S.

-----Original Message-----
From: Stieers, Ken [mailto:KStieers at DainRauscher.com]
Sent: Tuesday, December 14, 1999 1:57 PM
To: 'Scheidel, Greg'; MRTG users
Subject: RE: [mrtg] Re: Manually Editing Log Files

The raw data in the first line is what MRTG gets from the SNMP call.  The
data in the next section is a delta divided by the number of seconds
elapsed.  If the counter on the SNMP agent rolls over (which happens fairly
often if you are monitoring fast links), your numbers aren't going to add

As far as begin able to edit the file, you need to figure out when in the
log file your data fits.  How old is your data when compared to the current
time?  if its historical, you need to build the averaged numbers and fit
them into the log files where they go. 

Your other option, if you have all of the 5 minute readings, is to build a
script to feed rateup the data, one reading at a time.  It would take care
of averaging the data, etc.

Ken Stieers
Lan Administrator
Dain Rauscher Information Services

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