From: Paul Hignutt (Paul.Hignutt@ardenthealth.com)
Date: Mon Nov 22 2004 - 14:32:37 GMT-3
You will get all sorts of different opinions on the methodologies behind
this. Rules such as "take X bandwidth percentage utilized and add Y%
and this is what you should have" or something along these lines,
doesn't always achieve the most cost effective results.
In all honesty, a "rule of thumb" that works for company A won't always
work for company B. It doesn't just depend on the volume of traffic
that you have, and tools like MRTG for instance are somewhat misleading
because of how they round DOWN the AVERAGES over longer time spans. Most
of these tools don't even show you peak traffic used within their
polling cycle which for RRD based tools like MRTG is typically 5
MINUTES! You can have a LOT of much larger peaks than your average
traffic in 5 minutes, if your medium for example is a 1Gbps link.
You should also take into account the type of "WAN" links you have, are
you supporting QOS or not and if so for what sort of application, VOIP?,
the non-QOS supported applications you have, etc.
This is a good book to read, and it has information that will probably
help you make an informed decision of what is correct for your
environment. Although this isn't the only resource you should check
into.
http://www.amazon.com/exec/obidos/ASIN/1578700698/qid=1101143905/sr=2-1/
ref=pd_ka_b_2_1/002-0463748-4023220
Just my $0.02
-Paul
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
yuki hisano
Sent: Monday, November 22, 2004 10:23 AM
To: ccielab@groupstudy.com
Subject: OT: Bandwidth upgrade criteria
Hi,
How do engineers decide when a link needs an upgrade on speed?
What is the criterion people make their decisions based on?
Is there any documanted recommendation?
Thanks,
Yuki
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