I read "Each AWS Account has independently mapped AZs, which can vary between different accounts" in a book. As far as I know , each region has its well-defined AZs. So how does it come that the AZs vary from a user to another ?
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1Most likely to prevent unbalanced use of any one AZ. – gonzie Feb 10 '18 at 23:11
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Availability Zone A for my AWS account may not be the same as Availability Zone A for your account. The AZ mappings are created when your account is generated.
The idea is to distribute customer workloads within a region. Most customers pick AZs A, B, or C when launching instances (human nature). If everyone had the same AZ A, workloads would be hugely unbalanced in a region, and that AZ would be a failure point for a lot of customers.
myron-semack
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Just to add a clarification: AZ assignment is based on **Accounts**. Within an account, all IAM Users will experience the same AZs. However, AZs may differ *between* different AWS Accounts. – John Rotenstein Feb 12 '18 at 00:24