[mrtg] Re: Weekly Max Greater than Daily

Jim McAtee jmcatee at mediaodyssey.com
Wed Aug 14 01:19:54 MEST 2002


Thanks for pointing me toward the FAQ and the discussion of normalization.
It would seem that no normalization would be desirable for this type of data
(ie, the max values, or colums 3/4 should always be exactly the same as
columns 1/2.

In configuring these monitors I followed the example included with the
pmlines.pl script and set Options: gauge, absolute.  The goal of the script
(if you're unfamiliar with it) is simply to graph the number of phone lines
in use at any point in time.

>From reading the configuration file documentation, it seems that the gauge
option is desirable for this type of monitoring.  I'm not so sure about
combining 'gauge with 'absolute', however.  It seems that for a "gauge", you
would perform no normalization, since you're not tracking a rate.  Do you
know if using 'absolute' might be causing mrtg to normalize the data?


----- Original Message -----
From: "Alex van den Bogaerdt" <alex at ergens.op.HET.NET>
To: "Jim McAtee" <jmcatee at mediaodyssey.com>
Cc: "MRTG users" <mrtg at list.ee.ethz.ch>
Sent: Tuesday, August 13, 2002 4:54 PM
Subject: [mrtg] Re: Weekly Max Greater than Daily

> What happens is that the daily graph only looks at the averages
> (and the maximum is the max of those) whereas the other graphs
> may also look at the peak values (4th and 5th column).  This
> happens when you're using "WithPeaks", even if you try (and fail)
> to specify "d" there.
> The reason for this behaviour is, I guess, that the maximum and
> average values are expected to be the same for the daily part of
> the .log file.  As you can see, it isn't *exactly* the same.
> This has to do with normalization (see faq site).
> I must admit I too don't understand why "withpeaks" cannot look
> at the maxima for the daily graph.  Perhaps it is just a matter
> of time (or rather: lack thereof).

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