Amazon EBS optimization - Amazon EBS
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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:

  • io2 Block Express volumes are designed to deliver an average latency of under 500 microseconds for 16KiB I/O operations. io2 Block Express volumes also deliver better outlier latency compared to General Purpose volumes, reducing the frequency of I/Os exceeding 800 microseconds by over 10 times. 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.

  • gp2 and gp3 volumes are designed to deliver at least 90% of their provisioned IOPS performance 99% of the time in a given year.

  • st1 and sc1 volumes 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.

The I/O size of your workload will impact the observed average latency as latency increases with larger I/O size. For example, io2 Block Express volumes are designed to deliver an average latency of under 500 microseconds for 16KiB I/O operations.

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