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RDS uses EBS Elastic Volumes.https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-modify-volume.html
So whether changing IOPS or storage size or type it is handled seamlessly by the EBS EVs. The only exception would be if your database was created before EVs. Then the first time you make that storage change you will have some degraded performance while the old volumes are copied to the new EV ones. But from then on there should be no impact if you make any other changes again.
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