[mrtg] Re: New Idea

Shawn Barnhart swb at cmenoc.campbell-mithun.com
Wed Aug 30 23:33:21 MEST 2000

----- Original Message -----
From: "Alex van den Bogaerdt" <alex at slot.hollandcasino.nl>
To: "Shawn Barnhart" <swb at cmenoc.campbell-mithun.com>

> You're confusing graphing with collecting data.

Perhaps, but I'm using the collection of data to control what gets graphed.
If there were controls for graphing behavior relative to numerical values,
I'd use them instead.

> MRTG will consider values above MaxBytes to be faulty (if AbsMax is not
> used) and therefore MinBytes (if available) would do similar: reject
> values below MinBytes (and of course, AbsMin).
> If you trow away values above MaxBytes, graphing may seem to be okay but
> what about your maximum and average?

You're right it would trash those values, but it doesn't seem to stop us
from having or using MaxBytes, does it?

I guess what I'd like is a way to constrain the graphing between two values.
For whatever the reason there seem to be things that have a large absolute
operational range (say 0...1000) but where the interest and operational
variance is really between some subset of that range (say, 900-950).

Being able to force the graph to be just between the subset values would be

> This is reality.  You're monitoring reality.  If you're graphing a full
> while your bandwidth is utilized fully during 8 hours and zero during the
> other 16 hours, the average MUST be 33.3333... %

It's mathematically correct but in terms of practical reality its nonsense,
because I'm not concerned with those other hours.  They distort the view of
the 8 hours.

> Why do you think this is trivial.  Are you using MRTG for a long time and
> did you read (not: browse through) the mail list archive?
> I don't say it's not doable but it certainly is not trivial.

I'm sure its not trivial to do via mrtg, but its trivial through cron.  Just
run mrtg against the targets of interest during the hours of interest via
cron.  What part of the archive or mail list did I miss that tells me that
this won't work?

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