Rds mysql db RI after changing single-az to multi-az

Question

I have an rds mysql reserved instance (t2.medium) and it's single-az. What happens to the reserved instance if I change the db to multi-az? I mean do I loose the relevant discount? If not how I can get a full discount? Should I buy another single-az reserved instance?
Thanks,
Fabio

Answer

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.

https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_WorkingWithReservedDBInstances.html#USER_WorkingWithReservedDBInstances.MultiAZDBClusters

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.

Rds mysql db RI after changing single-az to multi-az

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