Amazon EBS optimization

An Amazon EBS–optimized instance uses an optimized configuration stack and provides additional, dedicated capacity for Amazon EBS I/O. This optimization provides the best performance for your EBS volumes by minimizing contention between Amazon EBS I/O and other traffic from your instance.

EBS–optimized instances deliver dedicated bandwidth to Amazon EBS. When attached to an EBS–optimized instance, General Purpose SSD (gp2 and gp3) volumes are designed to deliver at least 90% of their provisioned IOPS performance 99% of the time in a given year, and Provisioned IOPS SSD (io1 and io2) volumes are designed to deliver at least 90% of their provisioned IOPS performance 99.9% of the time in a given year. Both Throughput Optimized HDD (st1) and Cold HDD (sc1) deliver at least 90% of their expected throughput performance 99% of the time in a given year. Non-compliant periods are approximately uniformly distributed, targeting 99% of expected total throughput each hour. For more information, see Amazon EBS volume types.

For more information, see Amazon EBS–optimized instances in the Amazon EC2 User Guide.