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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Several good references …<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Normal Accident Theory<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Perrow, 1984; Wolf, 2001; Tamuz & Harrison, 2006<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">(Tom’s Wikipedia link is Perrow.)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">High Reliability Theory<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">LaPorte & Consolini, 1998; Weick & Sutcliffe, 2005<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">“Managing the unexpected” (Weick & Sutcliffe) can apply to lots of contexts, not just ICT.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><span style="color:black">Regards,<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><span style="color:black">Terry Sweetser<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><span style="color:black">General Manager, IX Australia<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><span style="color:black"><a href="mailto:tim@ix.asn.au" target="_blank"><span style="border:none windowtext 1.0pt;padding:0cm">Terry.Sweetser@ix.asn.au</span></a><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><span style="color:black">Mobile/WhatsApp: +61455067119<o:p></o:p></span></p>
<p class="MsoNormal"><img border="0" width="622" height="118" style="width:6.4791in;height:1.2291in" id="Picture_x0020_3" src="cid:image001.jpg@01D5F398.DF108CC0"><o:p></o:p></p>
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<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> AusNOG <ausnog-bounces@lists.ausnog.net>
<b>On Behalf Of </b>Tom Paseka<br>
<b>Sent:</b> Thursday, 5 March 2020 4:33 PM<br>
<b>To:</b> Mark Smith <markzzzsmith@gmail.com><br>
<b>Cc:</b> AusNOG Mailing List <ausnog@ausnog.net><br>
<b>Subject:</b> Re: [AusNOG] "Simple Systems Have Less Downtime"<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="line-height:150%">recommended reading: <a href="https://www.amazon.com/Normal-Accidents-Living-High-Risk-Technologies/dp/0691004129">Normal Accidents</a> / <a href="https://en.wikipedia.org/wiki/Normal_Accidents">https://en.wikipedia.org/wiki/Normal_Accidents</a><o:p></o:p></p>
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<p class="MsoNormal" style="line-height:150%"><o:p> </o:p></p>
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<p class="MsoNormal" style="line-height:150%">On Wed, Mar 4, 2020 at 7:59 PM Mark Smith <<a href="mailto:markzzzsmith@gmail.com">markzzzsmith@gmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="line-height:150%">On Thu, 5 Mar 2020, 14:07 Bevan Slattery, <<a href="mailto:bevan@slattery.net.au" target="_blank">bevan@slattery.net.au</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">There was a whole PhD paper demonstrating why planes with two engines were safer than planes with four due to risk of catastrophic failure having four engines/and complexity that
outweighed the additional redundancy it provided.<o:p></o:p></p>
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<p class="MsoNormal" style="line-height:150%"><o:p> </o:p></p>
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<p class="MsoNormal" style="line-height:150%">Having realised that "unnecessary complexity is the enemy", after working on both simple and complex networks and systems, I've been "collecting" simplicity idioms:<o:p></o:p></p>
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<p class="MsoNormal" style="line-height:150%"><o:p> </o:p></p>
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<p class="MsoNormal" style="line-height:150%">"Less is more." - Bauhaus Movement.<o:p></o:p></p>
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<p class="MsoNormal" style="line-height:150%"><o:p> </o:p></p>
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<p class="MsoNormal" style="line-height:150%">"Complex equals more things that can break." - Anonymous on Slashdot.<o:p></o:p></p>
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<p class="MsoNormal" style="line-height:150%"><o:p> </o:p></p>
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<p class="MsoNormal" style="line-height:150%">"Perfection is achieved, not when there is nothing more to add, but when there is nothing left to take away.” (in the context of aircraft design coincidentally) - Antoine de Saint-Exupéry, Airman's Odyssey.<o:p></o:p></p>
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<p class="MsoNormal" style="line-height:150%"><o:p> </o:p></p>
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<p class="MsoNormal" style="line-height:150%">"As simple as possible but no simpler."<o:p></o:p></p>
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<p class="MsoNormal" style="line-height:150%"><o:p> </o:p></p>
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<p class="MsoNormal" style="line-height:150%">"In protocol design, perfection has been reached not when there is nothing left to add, but when there is nothing left to take away." - RFC1925.<o:p></o:p></p>
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<p class="MsoNormal" style="line-height:150%">Somewhere along the line I came across a theory that the Roman Empire collapsed because of its complexity, and that continuing adding complexity will unavoidably result in catastrophic collapse.<o:p></o:p></p>
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<p class="MsoNormal" style="line-height:150%"><o:p> </o:p></p>
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<p class="MsoNormal" style="line-height:150%">Looking that up, I came across this paper that suggests persistent, determined and voluntary simplicity is the way to gain resilience and avoid complexity collapse.<o:p></o:p></p>
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"Resilience through Simplification: Revisiting Tainter’s Theory of Collapse"<br>
<a href="http://simplicityinstitute.org/wp-content/uploads/2011/04/ResilienceThroughSimplificationSimplicityInstitute.pdf" target="_blank">http://simplicityinstitute.org/wp-content/uploads/2011/04/ResilienceThroughSimplificationSimplicityInstitute.pdf</a><o:p></o:p></p>
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<p class="MsoNormal" style="line-height:150%">Regards,<o:p></o:p></p>
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<p class="MsoNormal" style="line-height:150%">Mark.<o:p></o:p></p>
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<p class="MsoNormal" style="line-height:150%"><o:p> </o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">[b]<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">AusNOG <<a href="mailto:ausnog-bounces@lists.ausnog.net" target="_blank">ausnog-bounces@lists.ausnog.net</a>> on behalf of Mark Smith <<a href="mailto:markzzzsmith@gmail.com" target="_blank">markzzzsmith@gmail.com</a>><br>
<b>Date: </b>Thursday, 5 March 2020 at 1:05 pm<br>
<b>To: </b>AusNOG Mailing List <<a href="mailto:ausnog@ausnog.net" target="_blank">ausnog@ausnog.net</a>><br>
<b>Subject: </b>[AusNOG] "Simple Systems Have Less Downtime"</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">This is excellent. About startups, however lots of parallels in network and network protocol architecture and design.
<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Simple Systems Have Less Downtime<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a href="https://www.gkogan.co/blog/simple-systems/" target="_blank">https://www.gkogan.co/blog/simple-systems/</a><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Also cross over with RFC1925, "The Twelve Networking Truths", for those that may not be aware if it.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a href="https://tools.ietf.org/html/rfc1925" target="_blank">https://tools.ietf.org/html/rfc1925</a><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">(RFC1925 might be the best RFC ever.)<o:p></o:p></p>
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<p class="MsoNormal" style="line-height:150%">_______________________________________________<br>
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