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Amazon RDS Multi-AZ replication now uses ENA Express

infraawsgaengineeraws-rds
feature patch

Amazon RDS Multi-AZ instances now leverage ENA Express, utilizing AWS's SRD protocol to enhance replication traffic between Availability Zones. This update promises up to 25 Gbps single-flow bandwidth, reduced latency variability, and increased write throughput for write-intensive workloads. The feature is available at no extra cost for several RDS engines and can be enabled on existing instances via a start-stop or compute scaling action.

  • →ENA Express for Multi-AZ replication with SRD protocol
  • →Improved write performance for write-intensive workloads
  • →Availability and enablement
Features (1) ›
  • ENA Express for Multi-AZ replication with SRD protocol

    Amazon RDS Multi-AZ instances now use ENA Express, which employs AWS's Scalable Reliable Datagram (SRD) protocol for replication traffic between Availability Zones. ENA Express optimizes network performance by delivering up to 25 Gbps single-flow bandwidth and reducing latency variability, benefiting synchronous replication for high availability.

Enhancements (1) ›
  • Improved write performance for write-intensive workloads

    The integration of ENA Express with the SRD protocol dynamically distributes traffic across multiple network paths and adapts to real-time congestion. This results in increased write throughput and lower write latencies for write-intensive database workloads.

Notes (1) ›
  • Availability and enablement

    ENA Express for Amazon RDS is available at no additional charge for MariaDB, MySQL, PostgreSQL, Db2, and Oracle engines. To enable it on existing instances, a start-stop or scale compute action is required. The feature is supported across numerous AWS regions, with specific instance type details available in the user guide.

Read the original announcement →

https://aws.amazon.com/about-aws/whats-new/2026/05/amazon-rds-ena-express-multiAZ/

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