nanog mailing list archives
RE: HE.net, Fremont-2 outage?
From: Alex Rubenstein <alex () corp nac net>
Date: Wed, 4 Nov 2009 14:06:03 -0500
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 () nac net, latency, Al Reuben -- -- Net Access Corporation, 800-NET-ME-36, http://www.nac.net --
Current thread:
- RE: T-Mobile ?, (continued)
- RE: T-Mobile ? Charles.Jouglard (Nov 03)
- Re: T-Mobile ? Sean Head (Nov 03)
- Re: HE.net, Fremont-2 outage? Michael J McCafferty (Nov 03)
- Re: HE.net, Fremont-2 outage? Lyndon Nerenberg (VE6BBM/VE7TFX) (Nov 03)
- Re: HE.net, Fremont-2 outage? Max Clark (Nov 03)
- Re: HE.net, Fremont-2 outage? Michael Holstein (Nov 04)
- Re: HE.net, Fremont-2 outage? Matthew Petach (Nov 04)
- Re: HE.net, Fremont-2 outage? Joe Greco (Nov 04)
- Re: HE.net, Fremont-2 outage? Seth Mattinen (Nov 04)
- Re: HE.net, Fremont-2 outage? Joe Greco (Nov 04)
- RE: HE.net, Fremont-2 outage? Alex Rubenstein (Nov 04)
- Re: HE.net, Fremont-2 outage? Joe Greco (Nov 04)
- Re: HE.net, Fremont-2 outage? Raphael Carrier (Nov 04)
- Re: HE.net, Fremont-2 outage? Scott Howard (Nov 04)
- Re: HE.net, Fremont-2 outage? Joe Greco (Nov 04)
- Re: HE.net, Fremont-2 outage? Scott Howard (Nov 04)
- Re: HE.net, Fremont-2 outage? Owen DeLong (Nov 04)
- RE: HE.net, Fremont-2 outage? Bryan King (Nov 04)
- Re: HE.net, Fremont-2 outage? Robert Mathews (OSIA) (Nov 04)
- Re: HE.net, Fremont-2 outage? Joe Greco (Nov 05)
- Human Factors and Accident reduction/mitigation Owen DeLong (Nov 05)