io2 Block Express

Provisioned IOPS SSD (io2 Block Express) volumes provide sub-millisecond latency and sustained high performance for sustained workloads. They're available under an opt-in preview and are only compatible with AWS Nitro System R5B instances. They're not designed for use as boot volumes and may worsen boot performance.


  • 99.999% durability (0.001% annual failure rate)
  • 4GiB-64TiB capacity per-volume
  • 256,000 IOPS per-volume
  • 4,000MiB/s throughput per-volume