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For Amazon Aurora adding a reader instance is how we provide multi-az recovery. During provisioning if you select multi-az we provision a reader instance but after provisioning adding a reader instance does the same thing
The storage (cluster) is replicated to multiple AZ's by default. The compute (instances) are AZ specific resources. If the writer instance is lost and you have reader instance provisioned this instance will be automatically promoted to writer. A big advantage here (compared to standard rds) is the reader instance can also be used for read activity (be sure to use the cluster reader endpoint)
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Try to add a new instance to the existing RDS cluster. You'd have an option to choose different zone.
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Thank you! I have added new Reader instance to my existing RDS cluster and it worked.