[mrtg] Re: Result from MRTG does not match actual file size copied

[PAUL WILLIAMSON]

Remeber that MRTG does rates of change, not file sizes.
Did you do a baseline measurement to figure out how 
much traffic is moving when there are no files 
being copied?  Did the file take the whole polling 
period to copy?  Did the file copy take longer than 
the polling period?  Did it start well after one, but 
before the next one, thus causing some sort of weird 
spike in between 3 polls?  MRTG was designed to give 
admins a rough idea of how their links were doing.  
Did you look at the exact number of bytes transferred 
in the router before the file transfer and after?  
I know my router guys did some benchmark comparisons 
and figured MRTG was closer to what the real traffic 
looked like vs. any of the commercially available 
offerings, but it was still off because of the 
normalization that goes on.

If you only have a hammer, every problem looks like a
nail.

Paul

>>> "steve" <spham at qwest.net> 05/08/02 23:06 PM >>>
Hi all,
 
Does everyone out there has compared the network statistic collected by
mrtg to the actual data move in or out 
that Nic?
 
I performed the comparison by starting the mrtg as a daemon and copied a
specified file size from monitored server to another.
After I done the coping I ran the mrtg_total.pl by Josef Wendel
(http://www.geocities.com/josef_wendel/) and compared both values. It
Turned out the value, which the mrtg_total.pl script calculated is 23 MB
bigger than the actual file size. 
 
Any advises is appreciated
 
Thanks,
 
Steve 


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