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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-35/">SRE Weekly Issue #35</a></h1>
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<div class="entry-date" itemprop="datePublished" >
<i class="genericon genericon-day"></i><a class="updated" href="https://sreweekly.com/sre-weekly-issue-35/">August 14, 2016</a>
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<a href="https://sreweekly.com/sre-weekly-issue-35/" title="Permalink to SRE Weekly Issue #35" class="email_only">View on sreweekly.com</a>
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<h2 style="text-align: center;font-size: 55%;color: #b0b0b0;">SPONSOR MESSAGE</h2>
<p>What is Modern Incident Management? Download the Incident Management Buyer’s Guide to learn all about it, and the value it provides. Get your copy here: <a href="http://try.victorops.com/l/44432/2016-08-04/dwp8lc">http://try.victorops.com/l/44432/2016-08-04/dwp8lc</a></p>
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<h2>Articles</h2>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://charity.wtf/2016/03/23/aws-networking-environments-and-you/" target="_blank">AWS Networking, Environments and You</a></div>
<div class="sreweekly-description">
<p>Whoops, here&#8217;s one that got lost in my review queue. Charity Majors (one of the usual suspects here at SRE Weekly) wrote one of her characteristically detailed and experience-filled posts on how to isolate your production, staging, and development environments in AWS.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://www.kitchensoap.com/2014/03/19/paradigm-check-point-prefacing-debriefings/" target="_blank">Paradigm Check Point: Prefacing Debriefings</a></div>
<div class="sreweekly-description">
<p>I can&#8217;t quite tell how much of this is John Allspaw&#8217;s writing and how much is written by the US Forestry Service, but I love it all. Here&#8217;s a bulleted list of points driving home the fact that we constantly strike a balance between risk and safety.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://blog.serverdensity.com/multi-data-center-redundancy-application-considerations/" target="_blank">Multi data center redundancy &#8211; application considerations</a></div>
<div class="sreweekly-description">
<p>Server Density added multi-datacenter redundancy to their infrastructure in 2013, and they were kind enough to document what they learned. In this first of two articles, they outline different kinds of multi-datacenter setups and go over the kinds of things you&#8217;ll have to think about as you retrofit your application.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://blog.serverdensity.com/making-a-point-with-slas/" target="_blank">Making a point with SLAs</a></div>
<div class="sreweekly-description">
<p>This short opinion piece raises an excellent idea: SLAs aren&#8217;t for recouping the cost you incurred due to an outage, they are for making a point to a service provider about the outage.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://www.dallasnews.com/business/airline-industry/20160810-cost-of-southwest-s-tech-outage-climbs-to-at-least-54-million.ece" target="_blank">Cost of Southwest&#8217;s tech outage climbs to at least $54 million</a></div>
<div class="sreweekly-description">
<p>Southwest has released some numbers on the impact of last month&#8217;s outage that resulted in thousands of cancelled flights.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://techblog.netflix.com/2016/08/netflix-and-fill.html" target="_blank">Netflix and Fill</a></div>
<div class="sreweekly-description">
<p>Netflix gives us a rundown of how they prepare a title for release by pre-filling caches in their in-house CDN. I like the part about timing pre-filling during off-peak hours to avoid impacting the service.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://www.nextplatform.com/2016/08/09/delta-datacenter-crash-math-disaster-recovery-roi/" target="_blank">Delta Datacenter Crash: Do the Math on Disaster Recovery ROI</a></div>
<div class="sreweekly-description">
<p>How much is your company willing to invest for a truly effective DR solution? This article asks that question and along the way digs into what an effective DR solution looks like and why it costs so much.</p>
</div>
</div>
<h2>Outages</h2>
<ul class="sreweekly-outages">
<li><a href="http://www.ibtimes.co.uk/syrias-mysterious-internet-outages-may-have-finally-been-solved-1575750">Syria</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">
<p>The Syrian government shut internet access down to prevent cheating on school exams.</p>
</ul>
<li><a href="http://blog.mailgun.com/mailgun-api-outage-post-mortem-august-2016/">Mailgun</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">
<p>Linked, find a really interesting postmortem: Mailgun experienced an outage when their domain registrar placed their domain on hold abruptly. The registrar was subsequently largely uncommunicative, hampering incident resolution. Lesson learned: make sure you can trust your registrar, because they have the power to ruin your day.</p>
</ul>
<li><a href="http://www.datacenterdynamics.com/content-tracks/security-risk/optical-card-failure-brings-down-belgiums-belnet/96758.fullarticle">Belnet</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">
<p>The linked article has some intriguing detail about a network equipment failure that caused a routing loop.</p>
</ul>
<li><a href="http://www.crn.com.au/news/ibm-breaks-silence-on-census-fail-433502">Australia&#8217;s census website</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">
<p>This caught my eye:</p>
<blockquote><p>Revolution IT simulated an average sustained peak of up to 350 submissions per second, but only expected up to 250 submission per second.</p></blockquote>
<p>Load testing only 40% above expected peak demand? That seems like a big red flag to me.</p>
</ul>
<li><a href="http://www.thebitbag.com/reddit-reason-site-offline/171592">Reddit</a>
<li><a href="http://www.thenational.ae/uae/technology/etisalat-internet-outages-reported-across-uae-for-second-day">Etisalat (UAE ISP)</a>
<li><a href="http://www.nltimes.nl/2016/08/10/nationwide-vodafone-4g-outage-resolved-hours-offline/">Vodafone</a>
<li><a href="http://www.androidpolice.com/2016/08/08/psa-google-drive-many-today-google-working/">Google Drive</a>
<li><a href="http://www.kansascity.com/news/local/article95516492.html">AT&amp;T</a>
<li><a href="http://bgr.com/2016/08/14/delta-finally-explained-how-one-power-outage-grounded-an-entire-airline/">Delta Airline</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">
<p>A datacenter power system failure resulted in cancelled flights worldwide.</p>
</ul>
</ul>
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