DB instance class support for RDS Custom for SQL Server

Check if the DB instance class is supported in your Region by using the describe-orderable-db-instance-options command.

RDS Custom for SQL Server supports the DB instance classes shown in the following table:

SQL Server edition	RDS Custom support
Enterprise Edition	db.r5.xlarge–db.r5.24xlarge db.r5b.xlarge–db.r5b.24xlarge db.m5.xlarge–db.m5.24xlarge db.r6i.xlarge–db.r6i.32xlarge db.m6i.xlarge–db.m6i.32xlarge db.x2iedn.xlarge–db.x2iedn.32xlarge
Standard Edition	db.r5.large–db.r5.24xlarge db.r5b.large–db.r5b.8xlarge db.m5.large–db.m5.24xlarge db.r6i.large–db.r6i.8xlarge db.m6i.large–db.m6i.8xlarge db.x2iedn.xlarge–db.x2iedn.8xlarge
Developer Edition	db.r5.xlarge–db.r5.24xlarge db.r5b.xlarge–db.r5b.24xlarge db.m5.xlarge–db.m5.24xlarge db.r6i.xlarge–db.r6i.32xlarge db.m6i.xlarge–db.m6i.32xlarge db.x2iedn.xlarge–db.x2iedn.32xlarge
Web Edition	db.r5.large–db.r5.4xlarge db.m5.large–db.m5.4xlarge db.r6i.large–db.r6i.4xlarge db.m6i.large–db.m6i.4xlarge db.r5b.large–db.r5b.4xlarge

The following recommendations apply to db.x2iedn class types:

• At creation, local storage is a raw and unallocated device. Before using a DB instance with this instance class, you must mount and format the local storage. Afterward, configure tempdb on it to ensure optimal performance. For more information, see Optimize tempdb performance in Amazon RDS Custom for SQL Server using local instance storage.

• Local storage reverts to its raw and unallocated state when you run DB instance operations such as scale compute, instance replacement, snapshot restore, or point-in-time recovery (PITR). In these situations, you must remount, reformat, and reconfigure the drive and tempdb to restore functionality.

• For Multi-AZ instances, we recommend that you perform the configuration on a standby DB instance. This way, if a failover occurs, the system continues to operate without issues because the configuration is already in place on the standby instance.