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<div class="moz-cite-prefix">On 24/06/2015 3:09 PM, Shane Short
wrote:<br>
</div>
<blockquote cite="mid:558A3B89.9050509@short.id.au" type="cite">
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What about on different continents? There could be some kind of
catastrophic act of god that wipes out both facilities? Oh..
separate hemispheres too, to protect you against freak storm
events..<br>
</blockquote>
<br>
Yep - thats exactly why Google and AWS zones are scattered across
the planet. Not so much from a facility point of view, but it helps
having a 'local' node for local customers to operate from if you've
lost connectivity between nodes, such as common cable cut scenario
(undersea earthquake off Phillipines took out 6 different submarine
cables simultaneously) type event.<br>
<br>
<br>
<blockquote cite="mid:558A3B89.9050509@short.id.au" type="cite">
<br>
At some point you play the odds. How many times has the
aforementioned "global fuckup" happened?<br>
</blockquote>
As it happened it wasn't service-affecting - it took out the '-2'
router in each pair in each city, the other one carried on, and
nobody noticed.<br>
Did cause some white knuckles though.<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<blockquote cite="mid:558A3B89.9050509@short.id.au" type="cite">
<br>
Paul Brooks wrote:
<blockquote cite="mid:558A3499.8060500@layer10.com.au" type="cite">
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<div class="moz-cite-prefix">On 24/06/2015 2:25 PM, Tim Raphael
wrote:<br>
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<blockquote
cite="mid:CAC3RH9o1+9Nyu6m7CudDr6=c0qN4G-cdGo-78tqUgJxROFOEPg@mail.gmail.com"
type="cite">
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<div class="gmail_extra"><br>
<div class="gmail_quote">On Wed, Jun 24, 2015 at 12:09 PM,
Mark Newton <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:newton@atdot.dotat.org" target="_blank">newton@atdot.dotat.org</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
<br>
If you aren't provider-diverse, you aren't diverse.<br>
<span class="HOEnZb"><font color="#888888"><br>
- mark<br>
</font></span>
<div class="HOEnZb">
<div class="h5"><br>
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<div>And ideally location diverse too for the purposes
of DR. The latency between Sydney and Melbourne for a
lot of our customers is so negligible at the
application layer that they buy two vDCs, one in each
of our Availability Zones and connect them together
via our MPLS services. Each zone in our case is
completely independent at the infrastructure level.</div>
</div>
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</blockquote>
<br>
Are the zones monitored by independent NOCs, and operated by
completely diverse NOC engineers so the same finger-fumble or
automated provisioning tool can't be applied to configs in both
locations?<br>
<br>
I've seen someone press 'commit' to a router config script with
a typo that proceeded to take down approx. 45 routers across
20-something countries. Each country was completely independent
at the infrastructure level then, too.<br>
<br>
+1 What Mark said above. If your multiple diverse services stem
ultimately from the same boardroom table, you aren't diverse.<br>
<br>
Paul.<br>
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