Amazon RDS Introduces Faster Storage for High-Performance Database Workloads
Briefly

With io2 Block Express volumes, your database workloads will benefit from consistent sub-millisecond latency, enhanced durability to 99.999 percent over io1 volumes, and drive 20x more IOPS/GiB from provisioned storage (up to 1,000 IOPS per GiB) at the same price as io1.
According to the cloud provider, io2 Block Express storage has the lowest p99.9 I/O latency and the best outlier latency control among leading cloud providers, positioning it as the optimal solution for I/O-intensive mission-critical workloads.
Read at InfoQ
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