HE.net, Fremont-2 outage?

Alex Rubenstein alex at corp.nac.net
Wed Nov 4 13:06:03 CST 2009


> Yup.  Related: "100% availability" is a marketing person's dream; it
> sounds good in theory but is unattainable in practice, and is a
> reliable sign of non-100%-reliability.

You are confusing two different things.

Availability != Reliability.

For instance, an airplane is designed to be 100% reliable, but much less available. To keep a 747 from not crashing (100% reliability) it needs significant downtime (not 100% available).



> And even for those who follow best practices...  You can inspect and
> maintain things until you're blue in the face.  One day a contractor
> will drop a wrench into a PDU or UPS or whatever and spectacular things
> will happen.  

That's were policies, procedures and methods come in (read: SAS70)


> Or a battery develops a strange fault.

Get more than one string, one more than one UPS, with monitoring. Batteries are NOT the Achilles heel everyone wants to make you believe they are.




"Question everything, assume nothing, discuss all, and resolve quickly."

-- Alex Rubenstein, AR97, K2AHR, alex at nac.net, latency, Al Reuben --
--    Net Access Corporation, 800-NET-ME-36, http://www.nac.net   --




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