Amazon RDS Multi-AZ now uses ENA Express for replication
infraawsengineer
feature
Amazon RDS Multi-AZ instances now leverage ENA Express, utilizing AWS's SRD protocol for cross-AZ replication traffic. This enhancement boosts network performance by delivering up to 25 Gbps single-flow bandwidth and reducing latency variability, benefiting write-intensive database workloads. Existing instances can enable this by performing a start-stop or compute scale action.
Read the original announcement →
https://aws.amazon.com/about-aws/whats-new/2026/05/amazon-rds-ena-express-multiAZ/