Today AWS announced general availability of io2 Block Express volumes that deliver up to 4x higher throughput, IOPS, and capacity than io2 volumes, and are designed to deliver sub-millisecond latency and 99.999% durability. io2 Block Express refers to io2 volumes running on the EBS Block Express architecture, and supports standard io2 features such as Multi-Attach and Elastic Volumes. io2 Block Express volumes are available first with Amazon EC2 R5b instances, which delivers the highest EBS-optimized performance, with support for other instances coming soon. Using R5b instances customers can now provision a single io2 volume with up to 256,000 IOPS, 4000 MB/s of throughput, and storage capacity of 64 TiB. This makes io2 Block Express and R5b instance combination ideal for your largest, most I/O intensive, and mission critical deployments of Oracle, SAP HANA, Microsoft SQL Server, and SAS Analytics.
Source:: Amazon AWS