On EBS it does at most 200MB/s disk IO just because the EBS operation latency even on io2 is about 0.5 ms. Even though the disk can go much faster, disk benchmarks can easily do multi-GB/s on nodes that have enough EBS throughput.
On instance local SSD on the same EC2 instance it will happily saturate the whatever instance can do (~2GB/s in my case).
