Part 5:(AZ Series) Availability Zone Names are logical names

Availability Zone Names are logical 


Availability Zones are not the same across AWS accounts. There is a common misconception that an AZ name like "US-east-1a" identifies a specific physical availability zone for everyone.  The fact is that AWS can map/remap the same AZ name to different physical availability zones across multiple accounts. The Availability Zone us-east-1a for account A is not necessarily the same as us-east-1a for account B. Zone assignments are mapped independently for each account. This is important when our infrastructure or use cases spans across multiple accounts. Example: Infrastructure provisioned through Account-A and Load Testing Agents are launched through Account-B, and both pointing to "US-east-1a" may not map to same AZ.


Other Related Articles :
(Full Article) Exploring Amazon Availability Zones 
Part 8: (AZ Series) Availability Zones : Simple Latency Test
Part 7: (AZ Series) AWS Availability Zones Usage charges
Part 6: (AZ Series) Guidelines for architecting applications across AWS Availability Zones
Part 5:(AZ Series) Availability Zone Names are logical names
Part 4: (AZ Series) How Amazon VPC uses Availability zones
Part 3: (AZ Series) How AWS Building blocks inherently leverage Availability Zones?
Part 2: (AZ Series) Why we should leverage AWS Availability Zones?
Part 1: (AZ Series) What is AWS Availability Zone ?