Ensure that your Amazon Database Migration Service (DMS) replication instances are using Multi-AZ deployment configurations to provide High Availability (HA) through automatic failover to standby replicas in the event of a failure such as an Availability Zone (AZ) outage, an internal hardware or network outage, a software failure or in case of a planned maintenance session.
With Multi-AZ feature enabled, AWS DMS service creates and maintains synchronous replicas across different Availability Zones to provide data redundancy, eliminate I/O freeze-ups and minimize latency spikes. Running a replication instance with Multi-AZ deployment enabled will improve availability during system maintenance, help protect the instance against failure and Availability Zone disruption, and provide redundant replication stream during ongoing replications and long database migrations.
To determine if your Amazon DMS replication instances are using Multi-AZ configurations, perform the following actions:
To update your Amazon DMS replication instances configuration in order to enable Multi-AZ deployment, perform the following actions: