Cross-Availability Zone ENA Express support for Multi-AZ deployments
Amazon RDS supports Cross-Availability Zone ENA Express for eligible DB instance classes in Multi-AZ deployments using AWS's Scalable Reliable Datagram (SRD) protocol. Cross-Availability Zone ENA Express increases single-flow network bandwidth enabling faster block-level data replication between primary and standby DB instances.
For more details on SRD and for a list of instance classes that support Cross-Availability Zone ENA Express, see ENA Express in the Amazon EC2 documentation.
Note
Cross-Availability Zone ENA Express is not supported for Amazon RDS for SQL Server.
Benefits
With Cross-Availability Zone ENA Express enabled, Multi-AZ deployments see an increase in single-flow bandwidth for data replication between Availability Zones. With advanced congestion control and multi-pathing capabilities, Cross-Availability Zone ENA Express reduces replication latency and replication latency variability and improves failover reliability for write-intensive workloads.
Actual throughput depends on the aggregate bandwidth limit of the DB instance class, the database engine, and your database configuration.
Enabling Cross-Availability Zone ENA Express
Cross-Availability Zone ENA Express is enabled by default on all newly created Multi-AZ DB instances that use eligible instance classes.
To enable Cross-Availability Zone ENA Express on an existing Multi-AZ DB instance, do one of the following:
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Stop and start the DB instance. For more information, see Stopping an Amazon RDS DB instance temporarily.
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Modify the DB instance to use an eligible instance class. For more information, see Modifying an Amazon RDS DB instance.
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Use Scale Compute on an eligible instance class. For more information, see Scale Compute
.