[mrtg] Re: Total Utilization of Serial Lines

[Ron Lyman]

----- Original Message -----
From: "Alex van den Bogaerdt" <alex at slot.hollandcasino.nl>

> Ron Lyman wrote:
> >
> > > My
> > > understanding is that the Max In/Max Out numbers are independent of
each
> > > other for serial lines, in that you cannot just add the numbers up and
> > > that's the total.  Is there another way?
> >
> > Maybe this will work for you.  I use this as a target perl script to
> > generate an In + Out graph on our ISDN WAN link.
>
> Right,
>
> The downside of this action:
>
> Consider an ISDN connection of 128kbps (full duplex, so 128kbps in and
> 128kbps out simultaniously).  You are summing in and out.  Therefore you
> will need to set maxbytes to (128kbps+128kbps==256kbps==) 32000.
>
> Now download something very big, without doing anything else on the line.
> You will get a transfer speed of 16000 bytes per second.  Provided that
> the download will last long enough, this will show up on the MRTG page
> at exactly half of the possible throughput...  Not what I would call
> reality.

Alex,

You're right on the money there.  FWIW I do use other graphs to monitor this
entity.  I like to see the total throughput.  That's all.  The script is
useful as an example for summing multiple interfaces and the user should
definitely keep in mind the usefullness of the data generated.  I'll try to
remember to include this kind of info on future postings.

Thanks,
Ron Lyman


--
Unsubscribe mailto:mrtg-request at list.ee.ethz.ch?subject=unsubscribe
Help        mailto:mrtg-request at list.ee.ethz.ch?subject=help
Archive     http://www.ee.ethz.ch/~slist/mrtg

--
Unsubscribe mailto:mrtg-request at list.ee.ethz.ch?subject=unsubscribe
Help        mailto:mrtg-request at list.ee.ethz.ch?subject=help
Archive     http://www.ee.ethz.ch/~slist/mrtg