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Provisioned IOPS volumes are designed to meet the needs of I/O-intensive workloads, particularly database workloads that are sensitive to storage performance and consistency in random access I/O throughput. A provisioned IOPS volume can range in size from 10 GB to 1 TB and the user can provision up to 4000 IOPS per volume. The ratio of IOPS provisioned to the volume size requested can be a maximum of 30; for example, a volume with 3000 IOPS must be at least 100 GB. Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSVolumeTypes.html
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The maximum ratio of provisioned IOPS to requested volume size (in GiB) is 50:1 for io1 volumes, and 500:1 for io2 volumes.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-volume-types.html
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https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-volume-types.html
The maximum ratio of provisioned IOPS to requested volume size (in GiB) is 50:1 for io1 volumes, and 500:1 for io2 volumes
An update for Nov 2020. There are two types of volume, io1, and io2.
For io1, the ratio between the I/OPS and the size of the volume is 50:1. That is if the volume size is 100 GB then it is able to afford 5,000 I/OPS at maximum.
On the other side for io2, its ratio is 500:1. That is if the volume size is 100 GB then it is able to afford 50,000 I/OPS at maximum.
One thing in common between those types is that the maximum I/OPS keeps 64,000 unchanged.
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