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RE: [nv-l] bandwidth utilization calculations..

To: "John M Gatrell" <John.Gatrell@uk.ibm.com>, <nv-l@lists.tivoli.com>
Subject: RE: [nv-l] bandwidth utilization calculations..
From: "Brian Backer" <brian.backer@CenturyTel.com>
Date: Thu, 3 Jul 2003 08:32:57 -0500
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Thread-topic: [nv-l] bandwidth utilization calculations..
I agree, I think this is the only system on our network that has half-Duplex gig..(ifconfig shows simplex) (and it's our TSM server... go figure)
I am using the raw data pulled from snmpget, thus the time factor was included.
Now, question for you.. If you have a half-D link, and you still calculate the utilization separately (in and out) How do you then take those figures and say "this link is xx% utilized"... or don't you?  I would assume that perhaps you would then add the 2 - %'s together and basically come up with the same deal.
-----Original Message-----
From: John M Gatrell [mailto:John.Gatrell@uk.ibm.com]
Sent: Thursday, July 03, 2003 4:32 AM
To: nv-l@lists.tivoli.com
Subject: [nv-l] bandwidth utilization calculations..

I'm surprised if your gigabit is actually half duplex.  Fibre versions tend to be full duplex,
one fibre in, one fibre out.  Copper versions can probably negotiate full duplex.

I normally measure BandwidthUtil-In and BandwidthUtil-Out separately to
avoid whether it's half or full duplex.

Now bandwidth percentage = 8 * 100 * Octets / Speed
Are you looking at the raw data, or trying to do this in mibExpr.conf?

I think that you don't need to divide ifInOctets by the 60 sec interval,
if using mibExpr.conf.  The type of the field means that the sample time
division is done for you. This means that the formula does not have to be adjusted
if one sample was missed.

So I think you should be dividing by 1,000,000,000  not by 60,000,000,000

So my mibExpr.conf looks like

BandwidthUtilIn \
"8*100* ifInOctets / ifSpeed"  \
       .  \
       .  /  \
       800 *

John Gatrell, B.A. Physics, CCNA
RMSC - IBM UK's Remote Managed Services Centre
Tel:  01932-81-4732 Internal 814732
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