[rtg] A lack of parity between RTG's counters and MRTG'scounters.

[Dierlam, Andy David]

>From my limited knowledge:

Its not the poll, its the plot.  MRTG uses rrd databases, which use
averages of averages, RTG plots counters directly, which is more
accurate.  

Advantages of rrd is database size, won't grow, as older data is
averaged, taking less space.  Mysql size will grow, but with lots of
disk space, no problems.



-----Original Message-----
From: rtg-bounces at lists.grdata.com [mailto:rtg-bounces at lists.grdata.com]
On Behalf Of andrew2 at one.net
Sent: Tuesday, December 04, 2007 4:31 PM
To: rtg at lists.grdata.com
Subject: Re: [rtg] A lack of parity between RTG's counters and
MRTG'scounters.

Drew Weaver wrote:
 
> Is my math wrong? or does MRTG and RTG poll differently enough to
> explain the difference in numbers? 


It's been a long while since I've used MRTG, but isn't MRTG's default
setting to assume missing values were the same as the last received
value,
whereas RTG chooses to not record a value at all?  A few missing polls
here
and there...that could account for MRTG's numbers being slightly higher
than
RTG's.  As to which method results in more accurate numbers...I guess it
would depend on your point of view.

Andrew

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