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Description

AWS Database Migration Service (DMS) replication instances should be configured to use multiple Availability Zones (Multi-AZ deployment) for high availability and resilience. In a Multi-AZ deployment, AWS DMS automatically provisions and maintains a standby replica of a replication instance in a different Availability Zone. The primary replication instance is synchronously replicated to the standby replica, ensuring minimal interruption if the primary instance fails or becomes unresponsive.

Remediation

Configure Multi-AZ deployment for your DMS replication instance by setting the Multi-AZ parameter to true. After creating a replication instance, you can modify the Multi-AZ deployment setting. For guidance on changing this setting for an existing replication instance, refer to the Modifying a replication instance section of the AWS Database Migration Service User Guide.