Chris's Wiki :: blog/tech/AffinityCascadeProblem Commentshttps://utcc.utoronto.ca/~cks/space/blog/tech/AffinityCascadeProblem?atomcommentsDWiki2009-02-27T13:30:44ZRecent comments in Chris's Wiki :: blog/tech/AffinityCascadeProblem.From 99.236.197.201 on /blog/tech/AffinityCascadeProblemtag:CSpace:blog/tech/AffinityCascadeProblem:e26a2ef4f76e11dc02d6d98afa890994750742e4From 99.236.197.201<div class="wikitext"><p>Sounds like Google should be talking to the folks who handled the power outage of 2003; their problems would seem to be very similar. Maybe they can hire some HydroOne types who got bought out.</p>
<p>MikeP</p>
</div>2009-02-27T13:30:44ZBy Chris Siebenmann on /blog/tech/AffinityCascadeProblemtag:CSpace:blog/tech/AffinityCascadeProblem:17d92ff8bf0023a4edc6addb09aed26b99781a25Chris Siebenmann<div class="wikitext"><p>My short answer is that if you have reliable procedures to transparently
take things out of service and put them back in then yes, absolutely you
should do maintenance during normal working hours when people are actually
awake and fully functional. From all reports Google has such procedures
and routinely does just this.</p>
</div>2009-02-26T22:36:33ZFrom 80.99.93.127 on /blog/tech/AffinityCascadeProblemtag:CSpace:blog/tech/AffinityCascadeProblem:9bb1a1fba1b3eb9f927516b4f84642024b20d171From 80.99.93.127<div class="wikitext"><blockquote><p>there was a routine maintenance event in one of our
European data centers.</p>
</blockquote>
<p>Not closely related to affinity, in the same sense of the word, but it's another maintenance problem: if you are a global entity, with geographically disperse equipment and personnel, you can choose to do your maintenance in time <em>and</em> in space. Is it a good thing to do major changes in your European data center in European time? If the people responsible for maintaining it are there as well, it seems to be logical, because this is when they are awake. But considering the impact, it might not be.</p>
<p>-- Janos <a href="http://farkas.ch/">http://farkas.ch/</a></p>
</div>2009-02-26T12:42:16Z