R8G Instance Types for Aurora MySQL

Yes, R8g instance types are indeed available for Amazon Aurora in both Ohio (US East) and Oregon (US West) regions, as well as in US East (N. Virginia) and Europe (Frankfurt). However, there are a few important points to consider:

1. The R8g instances are specifically powered by AWS Graviton4 processors and are designed for memory-optimized workloads.

2. These instances are supported for both Aurora MySQL and Aurora PostgreSQL compatibility.

3. For Aurora MySQL, R8g instances are supported for version 3.08.0 and higher.

4. The available sizes for R8g instances include large, xlarge, 2xlarge, and 4xlarge.

5. R8g instances offer up to a 40% performance improvement and up to 29% price/performance improvement over equivalent Graviton3-based instances, depending on the specific workload and configuration.

If you're unable to see these instance types when creating or modifying an instance, it could be due to a few reasons:

1. You might be using an Aurora MySQL version earlier than 3.08.0, which doesn't support R8g instances.

2. The specific Aurora cluster you're working with might not be compatible with R8g instances.

3. There could be a temporary availability issue in your specific region or Availability Zone.

To resolve this, you could try the following:

1. Ensure you're using Aurora MySQL version 3.08.0 or higher.

2. Double-check that you're in the correct region (Ohio or Oregon).

3. If the issue persists, you may want to contact AWS support for further assistance.

Remember, while these instance types are generally available in the mentioned regions, their visibility and availability can sometimes be affected by various factors.
Sources
Amazon Aurora now supports Graviton4-based R8g database instances - AWS
Supported DB engines for DB instance classes - Amazon Aurora