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A comment on Immutable Infrastructure: No SSH. Parent comment

Re:Immutable Infrastructure: No SSH by axelfontaine on Monday July 13, 2015 @08:06AM (#9877568)
"Availability Zones (AZs) are within a DC" => not really

See this Re:Invent 2014 talk about AWS Innovation At Scale http://mvdirona.com/jrh/talksandpapers/JamesHamiltonReInvent... => Slide 9: "Each AZ is 1 or more DC, No data center is in two AZs, Some AZs have as many as 6 DCs"

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Re:Immutable Infrastructure: No SSH by mugsie on Monday July 13, 2015 @08:29AM (#9877687)
Sorry - you are right, with the scale of Amazon they are within a region. But that is still not Geo-Redundant. If a hurricane takes out Virgina, you are still going to loose your data.
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Re:Immutable Infrastructure: No SSH by tgeek on Monday July 13, 2015 @09:41AM (#9877985)
AZ's are typically 5-15miles apart. Needs to be a pretty large hurricane that far in land to take out all the various datacenters.

Also, just to clarify, you can do multi-region RDS read-replicas for MySQL: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_...

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Re:Immutable Infrastructure: No SSH by lamontcg on Monday July 13, 2015 @01:29PM (#9879570)
The Virginia DCs are in different flood plains and on different power grids. A hurricane remnant did hit the one year (2005 probably) and a tornado took out power to one of them.
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