Changing a Storage Type

Scenarios

If the storage type of your DB instance does not match your workloads, you can change it as needed.

Constraints

• If the storage type of a read replica is different from that of its associated DB instance, the data synchronization may be affected. To change the storage type of a DB instance, change that of its read replica (if any) first to ensure that the storage type of the read replica is the same as that of the DB instance.
• During the storage type change, operations such as changing the instance class and scaling up storage space cannot be performed on the instance.
• Changing the storage type may affect the disk performance, so you need to change the type during off-peak hours.
• Changing the storage type may take several minutes, hours, or even days. The time required depends on the throughput, storage space, and original storage type. This operation cannot be paused.
• In rare cases, the change may fail due to resource problems. If this happens, you are advised to perform the change again.
• Due to Elastic Volume Service (EVS) constraints, there can be a maximum of 10 EVS disks with their types being changed at the same time. You may have to wait in a queue when you change your storage type.

Supported Storage Types

Procedure

1. Click in the upper left corner and select a region.
2. Click in the upper left corner of the page and choose Databases > Relational Database Service.
3. On the Instances page, locate the target DB instance and choose More > Change Instance Class in the Operation column.

   Alternatively, click the instance name to go to the Overview page. Under Instance Class, click Configure.

4. On the displayed page, select a new storage type and click Next.
   Figure 1 Changing a storage type
   

5. Confirm the new storage type.
   • To modify your settings, click Previous.
   • For pay-per-use DB instances, click Submit.
   • For yearly/monthly DB instances, click Pay Now. The change starts only after the payment is successful.

6. Check the result.

   Return to the Instances page. After a few minutes, click the instance name and check the new storage type on the displayed Overview page.