On Nov 21, 2023, Amazon Elastic Block Store (EBS) announced that io2 Block Express volumes are available on all EC2 instances built on the Nitro system. https://aws.amazon.com/about-aws/whats-new/2023/11/amazon-elastic-block-store-io2-block-express-nitro/
io2 also has much higher durability than io1. There is a comparison here: https://aws.amazon.com/ebs/provisioned-iops/
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All io2 volumes created after November 21, 2023 are io2 Block Express volumes. io2 volumes created before November 21, 2023 can be converted to io2 Block Express volumes by modifying the IOPS or size of the volume. https://docs.aws.amazon.com/ebs/latest/userguide/ebs-volume-types.html
See Amazon EBS volume types documentation for differences between io1 and io2 block express.
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