[mrtg] Re: Incorrect Speeds to log file and graph

[Alex van den Bogaerdt]

Chris Dohan wrote:

> The other day the power went off and when I restarted mrtg wouldn't work
> correctly. The speeds are being reported incorrectly. I could have around
> 300kilobytes per second of bandwidth and mrtg reports less than 1 kilobyte
> per second. I finally did get it working again by creating a new config file
> using a different "Working Directory", so mrtg had to re-create the .log
> files from scratch.

OK, new config file.  Did you by any chance also change something in
the target line?  Perhaps the interface you're monitoring now has an
other number?

Try to copy the current mrtg.cfg and the previous mrtg.log files into
a 3rd directory and run mrtg on that copy too.  If it behaves like the
original instance it most likely is a corrupt log file despite the
absence of warnings.  If it behaves like the 2nd instance, it probably
is a changed config on the restarted device.

>                     This works, however I want to use my old .log files so
> the rest of the data will be displayed. There are no errors or warnings from
> rateup about a corrupted log file. The config files I also tested, and are
> fine. I can't figure out what is wrong. Any suggestions appreciated.

It is possible, by hand, to merge two log files.  For the long story
you'll have to dig in the archives of this list.  In short:
1) sync the two log files to the same time by running mrtg on both
   of them at the same time
2) take the top of the current log file and the bottom of the previous one
3) test, and revert to your backed up copy if necessary

HTH
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