• Combination of data centers
  • Data centers are called AZ, i.e. Availability Zone


  • Availability Zone
  • In region, couple of AZ exists
  • AZ are isolated each other, so Disaster in one AZ does not impact on other AZ

AZ and Region

  • Some service are AZ scoped
  • Some services are Global scope
  • AZ name can be us-east-1a, us-east-2b
  • Region name be us-east, us-west
  • AZ names are randomized according to the Account
  • us-east-1a in one account could be us-east-1b to another account