nanog mailing list archives

Re: outages, quality monitoring, trouble tickets, etc


From: Scott Huddle <huddle () mci net>
Date: Mon, 27 Nov 1995 14:47:58 -0500

Jonathan Heiliger <loco () mfst com> writes
On Nov 27,  9:17am, Sean Doran wrote:
    Jonathan> Everyone likes to portray
    Jonathan> the image of having a 99.98% uptime whenever
    Jonathan> possible, even though most folks realize
    Jonathan> that it just plain isn't possible

Well, more importantly, what on earth does a number like
that mean?

Sorry, bad choice of words.  Rather than uptime, availability would be the
proper word.  Availability tends to be the amount of time the network is
"available" for the customer to receive their expected service (whether
guaranteed in writing or not), and for the customers expectation of how the
service will perform when it is considered "in-service" is met.
 
This is reasonable expectation, but unfortunately it's pretty difficult
to measure what "the network" is.  Do you mean your NSPs backbone?  Its
connections to other NSPs?  Connections to a specific site?  Global
connectivity?  How do you factor when you or a target site is singly
connected?

-scott


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