Determining the location of the secondary
You can determine the location of the secondary replica by using the AWS Management Console. You need to know the location of the secondary if you are setting up your primary DB instance in a VPC.
You can also view the Availability Zone of the secondary using the AWS CLI command
describe-db-instances
or RDS API operation DescribeDBInstances
.
The output shows the secondary AZ where the standby mirror is located.