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I am running a Small RDS of Mysql 5.1 instance with Multi AZ on. I need to upgrade to large instance now. What will be the down time of the RDS instance while upgrading it. Please let me know

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It had one to two minutes of downtime when I did this on my multiAZ setup a while back.

You could fire up a test instance and do a dry-run on it to be sure.

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