How long will the AWS RDS outage take when enabling backups?

Question

The documentation (https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_WorkingWithAutomatedBackups.html) states that in case of changing the retention period from 0 to some positive number, there will be an outage. Unfortunately i cannot find any info on how long will it be.

This is a production db for high availability service - and I do not want it to take like an hour or so.

The db size is significant - about 100 GB.

Does anyone know how long can it take?

Answer

That answer is not quite correct. For RDS engines other than Aurora, the documentation is accurate: when enabling a backup retention there is a brief outage while we restart the database. It is just the time it takes to reboot the database.

Answer

There is no outage to enable automated backup in RDS Service. When you modify instance and enable backup retention period there will be an I/O suspension typically for few seconds for RDS service to initiate snapshot backup of storage volumes used by RDS db engine.

How long will the AWS RDS outage take when enabling backups?

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