Ensure that your RDS clusters are using Multi-AZ deployment configurations for high availability and automatic failover support fully managed by AWS.
When Multi-AZ is enabled, AWS automatically provision and maintain a synchronous database standby replica on a dedicated hardware in a different datacenter (known as Availability Zone). AWS RDS will automatically switch from the primary cluster to the available standby replica in the event of a failure such as an Availability Zone outage, an internal hardware or network outage, a software failure or in case of planned interruptions such as software patching or changing the RDS cluster type.
To determine if your RDS clusters are using Multi-AZ configuration, perform the following:
To update your RDS clusters configuration and enable Multi-AZ deployment, perform the following: