I second this, upgraded 100 odd instances using pg_upgrade. And it's lightning fast, takes less than a min whether the db cluster is a couple GB or a few TB. Ju

I second this, upgraded 100 odd instances using pg_upgrade. And it's lightning fast, takes less than a min whether the db cluster is a couple GB or a few TB. Just make sure that you always run the check mode to catch incompatibilities between versions.