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"Those customers with affected instances or volumes that were running in multi-Availability Zone configurations avoided meaningful disruption to their applications"

"Meaningful disruption" is a bit of a weasel word; Amazon's own EBS API was down for almost two hours[1] despite being designed to use multiple AZs

[1] "the EBS-related EC2 API calls were impaired from 8:57PM PDT until 10:40PM PDT ... The EC2 and EBS APIs are implemented on multi-Availability Zone replicated datastores"

Guess the moral of the story is, if you require high availability then you must test your system in the face of an availability zone outage.

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