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Is there a reason you aren't using Elastic re-size for both operations? Our docs say you can use Elastic re-size to change node types if the new/old node types are supported so it would be worth double checking that.
Whilst CDC will work after you've done the migration as you aren't changing DB configuration, during the re-size you won't be able to update the DB on the Redshift cluster, as per our docs "During the resize operation, the cluster is read-only"
For elastic re-size, this would be 10-15 minutes, but for classic resize this could be 2 hours - 2 days and it's something you'd want to prepare your customer for.
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