Defined in github.com/aws/aws-sdk-go/service/rds/api.go
The amount of Provisioned IOPS (input/output operations per second) to be initially allocated for the DB instance.
Constraints: Must be a multiple between 3 and 10 of the storage amount for the DB instance. Must also be an integer multiple of 1000. For example, if the size of your DB instance is 500 GB, then your Iops value can be 2000, 3000, 4000, or 5000.