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In the AWS context, they are, in fact. That's the original point of them - so during big AZ failures your reserved instances had first dibs on the available capacity.

The billing thing became more of the point as big AZ failures are so rare.



Non-zonal instance reservations do not reserve capacity. https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-capa...


Well, yeah. But the zonal ones still do.




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