Talk:Notification system

comments of 6 January 2006
In the Fail-over Scenarios section, had the sentence: "High availability means that a system must be up and running 99.99999% of the time. "

I changed the percentage to 99.999%. In my experience, the term 'Five nines' availability refers to all the nines, not just the ones to the right of the decimal point. 99.999% availability means you can only have 26 seconds per month, or about 5 minutes per year, of downtime. That is the standard most managers of high availability systems are trying reach when they refer to 'Five nines'. And very few, even high availability systems, get there. Much less 99.99999%. That's about 26 seconds per _year_.

And I messed up my own math there. 99.99999 would be about 3 seconds per _year_. Good luck!

In fact, I just noticed there's a Wikipedia article about this, http://en.wikipedia.org/wiki/The_Myth_of_the_Nines (wikilinked later: The_Myth_of_the_Nines?)

And, from http://en.wikipedia.org/wiki/Availability: "Note 2: Typical availability objectives are specified either in decimal fractions, such as 0.9998, or sometimes in a logarithmic unit called nines, which corresponds roughly to a number of nines following the decimal point, such as "five nines" for 0.99999 reliability.  Source: from Federal Standard 1037C in support of MIL-STD-188"

Note that the factor, .99999 ("five nines"), is the same as 99.999 percent. I'll stop soon. Really.

Remove Link Spam
Links section is filling up with link spam. Please review Wikipedia linking guidelines, particularly the section regarding links which promote commercial websites WP:EL. If you wish to add external links, please submit request to discussion page here first and let a Neutral editor add the link. Calltech 17:55, 13 November 2006 (UTC)

Proposed inclusion of External Link
Following the procedure as requested, I would like the following external link added by a Neutral editor please. Emergency Notification System for the U.S. Air Force Reserve Command provided by AtHoc Aerobe (talk) 13:13, 10 June 2009 (UTC)

mathematics on the general topic
The general topic has been studied in academic mathematics literature. For example, for a system like a fixed telephone tree to share news/info from every node to every other node, what configuration of connection would guarantee that all info gets to every recipient if there is one transmission failure. Or if there are two failures, or three, etc. The article should be improved to indicate some of this. -- do ncr  am  19:14, 10 September 2015 (UTC)

Sub
ENGLISH 103.155.118.138 (talk) 13:25, 31 January 2022 (UTC)

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