Amazon RDS on VMware Adds Support for Cross-Custom-Availability-Zone Read Replicas
To provide enhanced performance and read scalability, Amazon RDS on VMware adds support for read replicas across Custom Availability Zones for MySQL and PostgreSQL databases. You can create cross-custom-availability-zone read replicas of a DB instance to serve read traffic in one region, thereby increasing aggregate read throughput. A read replica can also be promoted to become a standalone DB instance if the source DB instance fails.
RDS on VMware cross-custom-availability-zone read replicas are available to all RDS on VMware customers running PostgreSQL versions 10.9 and 10.10, and MySQL version 5.7. Customers must create at least two custom availability zones in one region to create cross-availability-zone read replicas. See the RDS on VMware User Guide for more details.