Amazon RDS io2 Block Express volumes are now available in all commercial regions, except and AWS GovCloud (US) and AWS China regions. Amazon RDS io2 Block Express volumes provide consistent sub-millisecond latency for mission critical workloads.
Amazon RDS io2 Block Express volumes are designed for all your critical database workloads that demand high performance, high throughput, and consistently low latency. io2 Block Express storage has the lowest p99.9 I/O latency and the best outlier latency control among major cloud providers, making it ideal for the most I/O-intensive, mission-critical database workloads. io2 Block Express supports 99.999% durability, up to 64 TiB volumes, 4,000 MB/s throughput, and up to 256,000 Provisioned IOPS for your most demanding database needs for the same price as Amazon RDS io1 volumes. You can upgrade from an Amazon RDS io1 volume to an Amazon RDS io2 Block Express without any downtime using the ModifyDBInstance API.
To learn more about Amazon RDS storage, visit the Amazon RDS User’s Guide. Create or update a fully managed Amazon RDS database with an io2 Block Express volume or modify an existing io1, gp2, or gp3 volume type without disruptions in the Amazon RDS Management Console.
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Source: Amazon Web Services
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