Re: The Myth of Five 9's Reliability (fwd)

[Marshall Eubanks <tme () multicasttech com>]

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: CAnet-3-NEWS () canarie ca
> > 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:  houle () acns fsu edu.
> Academic Computing & Network Services        Voice:  850-644-2591
> Florida State University                   FAX:  850-644-8722


--
                                 Regards
                                 Marshall Eubanks

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T.M. Eubanks
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