RDS Reserved Instances, instance size increased

Question

We have an db.m6g.8xlarge instance that was recently upgraded from a db.m6g.4xlarge.

We also have a reserved instance for this of the size  db.m6g.4xlarge, which appears to be applying to half of the instance.  My question is, am I able to get another RI with the size of db.m6g.4xlarge, which would cover the other half, effectively being a db.m6g.8xlarge RI?

The documentation on reserved instances is kind of confusing and it's not entirely clear, I'd like to know for certain before I commit to another RI.

Thanks,
Keith

Accepted Answer

If you say that your RI still applies to half of the instance, then you use size-flexible platform. And yes, in that case you could buy an extra db.m6g.4xlarge RI, which will effectively be covering another half of your running instance.

Note that the end date of the new RI will be different from the original one. You will have a situation later in the future where one of your RIs will expire, and another one will still be active. You will either need to refresh (repurchase) one of your RIs, or maybe you might need to downsize your instance later at that time, and in that case you can skip the renewal of that first expired RI and continue running .4xlarge with just one RI.

RDS Reserved Instances, instance size increased

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