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It really depends on the data and schema in your database. Typically a minor version upgrade should not have high io requirements but there is no way to say for sure. You could consider the following: restore a snapshot of your production database and test the upgrade there to find out. Or you could look into the new feature Blue Green Deployments. This will create a replica of your environment and run the upgrade on that (green) environment. Then you can perform the switchover to the new environment after the upgrade is all complete and the new target environment is all ready to go.
https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/blue-green-deployments-overview.html
hth, Phil
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Thank you for your answer, I'll create a test DB instance from Production data snapshot and test the upgrade.
We've tested the upgrade with a created copy of production database, and found it takes about 10 minutes as same of development environment. Thank you.