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When you want to save on multi-az instances you can do it in the following ways:
- Reserve a multi-az reserved instance
- Reserve 2 sigle-az reserved instances In both cases, the discount would be fully applied to your cluster. If you already have a reserved instance (t2.medium) the next step would be to purchase another single-az reserved instance (t2.medium) so that the total discount on your multi-az can be covered.
In the documentation you can review the example "Multi-AZ DB instance normalized units per hour (deployment with one DB instance and one standby)" to understand a little more about normalized units.
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Hi Max, thank so much for your answer. I need a further clarification. I'm using Multi-AZ DB instance deployment not cluster deployment. Is it the same from a saving perspective?
Yes, I edited my answer, for multi-az the discount applies.