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Re: The Myth of Five 9's Reliability (fwd)
- From: Marshall Eubanks
- Date: Wed Apr 24 17:04:00 2002
Art Houle wrote:
How to calculate uptime and get 5 9s
-do not include any outage less than 20 minutes.
-only include down lines that are actually reported by customers.
-when possible fix the line and report 'no trouble found'.
-remember that your company is penalized by the FCC for bad ratings, so
don't report any problems that you do not have to.
You forgot my favorite :
Every trouble report from a customer must include at least 2 hours on
hold before a ticket is opened.
Regards
Marshall Eubanks
On Wed, 24 Apr 2002, Pete Kruckenberg wrote:
From the Canarie news mailing list.
I don't think I've ever experienced five 9's on any telco
service, I have always assumed I must be the one customer
experiencing down-time, and the aggregate was somehow five
9's. How is network reliability calculated to end up with
five 9's?
Pete.
---------- Forwarded message ----------
Date: Wed, 24 Apr 2002 10:08:18 -0400 (EDT)
From: [email protected]
Subject: [news] The Myth of Five 9's Reliability
For more information on this item please visit the CANARIE CA*net 3 Optical
Internet program web site at http://www.canet3.net/news/news.html
-------------------------------------------
[A good article on the truth about five 9's reliability. Some excerpts -
BSA]
http://www.bcr.com/forum
Deep Six Five-Nines?
For much of the 20th century, the U.S. enjoyed the best
network money could buy; hands-down, it was the most modern,
most ubiquitous and most reliable in the world. And one
term--five-nines--came to symbolize the network's
robustness, its high availability, its virtual
indestructibility. When the goal of five-nines was set, the
network was planned, designed and operated by a monopoly,
which was guaranteed a return on whatever it invested. It
was in the monopoly's interest to make the network as
platinum-plated as possible.
One of the key points is that "five-nines" has long been
somewhat overrated. Five-nines is NOT an inherent capability
of circuit-switched, TDM networks. It's a manmade concept,
derived from a mathematical equation, which includes some
things and leaves out others.
It's critical to remember that when you run the performance
numbers on ALL the items in a network--those that are
included in the five-nines equation and those that
aren't--you're probably going to wind up with a number less
than 99.999 percent. A well-run network actually delivers
something around 99.45 percent.
The gap between the rhetoric of five-nines and actual
network performance leads to the conclusion that five-nines
may not be a realistic or even necessary goal.
Art Houle e-mail: [email protected]
Academic Computing & Network Services Voice: 850-644-2591
Florida State University FAX: 850-644-8722
--
Regards
Marshall Eubanks
This e-mail may contain confidential and proprietary information of
Multicast Technologies, Inc, subject to Non-Disclosure Agreements
T.M. Eubanks
Multicast Technologies, Inc
10301 Democracy Lane, Suite 410
Fairfax, Virginia 22030
Phone : 703-293-9624 Fax : 703-293-9609
e-mail : [email protected]
http://www.multicasttech.com
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