AZs in AWS are essentially distinct "datacenters" from a logical perspective. Th... | Hacker News

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toomuchtodo on Oct 1, 2014 | parent | context | favorite | on: EC2 Maintenance Update II

AZs in AWS are essentially distinct "datacenters" from a logical perspective. There is no shared infrastructure between them; if AZ B drops off, as long as you have your data and instances replicated and serving in another AZ, you will see no downtime.

mentat on Oct 2, 2014 [–]

That is "in theory". In fact there have been region wide failures at the AWS services level, though none recently that I know of.

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