Scaling Up Storage Space

Scenarios

If the original storage space is insufficient as your services grow, scale up storage space of your DB instance. The backup space increases with the instance scale-up.

The DB instance needs to preserve at least 15% of its capacity to work properly. The new minimum storage space required to make this instance available has been automatically calculated for you.

You are advised to set alarm rules for the storage space usage by referring to Setting Alarm Rules.

RDS allows you to scale up storage space of DB instances but you cannot change the storage type. During the scale-up period, services are not interrupted.

Constraints

• You can scale up storage space only when your account balance is greater than or equal to $0 USD.
• You can scale up storage space only when your instance status is Available or Storage full.
• The maximum allowed storage is 4,000 GB. If you want to increase the storage upper limit to 10 TB, contact customer service.
• The DB instance is in Scaling up state when its storage space is being scaled up and the backup services are not affected.
• For primary/standby DB instances, scaling up the primary DB instance will cause the standby DB instance to also be scaled up accordingly.
• Reboot is not required during DB instance scaling-up.
• You cannot reboot or delete a DB instance that is being scaled up.
• Storage space can only be scaled up, not down.
• If you scale up a DB instance with the disk encrypted, the expanded storage space will be encrypted using the original encryption key.

Scaling Up a Primary DB Instance

1. Log in to the management console.
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 > Scale Storage Space in the Operation column.

   You can also perform the following operations to scale up storage space:

   • Click the DB instance name to enter the Basic Information page. In the Storage Space area, click Scale.
   • If the storage space is full, locate the DB instance on the Instances page and click Scale in the Status column.

4. On the displayed page, specify the new storage space and click Next.

   The minimum increment for each scaling is 10 GB.

5. Confirm specifications.
   • If you need to modify your settings, click Previous.
   • If you do not need to modify the settings, click Submit for a pay-per-use instance or click Pay Now for a yearly/monthly instance.

6. View the scale-up result.

   Scaling up storage space takes 3-5 minutes. During the time period, the status of the DB instance on the Instances page will be Scaling up. Click the DB instance and view the new storage space on the displayed Basic Information page to verify that the scale-up is successful.

   For RDS for MariaDB instances, you can view the detailed progress of the task on the Task Center page. For details, see section Task Center.

Scaling Up a Read Replica

Scaling up the storage space of a read replica does not affect that of the primary DB instance. Therefore, you can separately scale read replicas to meet service requirements. New storage space of read replicas after scaling up must be greater than or equal to that of the primary DB instance.

1. Log in to the management console.
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 click in front of it. Locate the read replica to be scaled and choose More > Scale Storage Space in the Operation column.

   You can also perform the following operations to scale up storage space:

   • Click the read replica name to enter the Basic Information page. In the Storage Space area, click Scale.
   • If the storage space is full, locate the read replica on the Instances page and click Scale in the Status column.

4. On the displayed page, specify the new storage space and click Next.

   The minimum increment for each scaling is 10 GB.

5. Confirm specifications.
   • If you need to modify your settings, click Previous.
   • If you do not need to modify your settings and the read replica uses pay-per-use billing, click Submit.

6. View the scale-up result.

   Scaling up storage space takes 3-5 minutes. During the time period, the status of the read replica on the Instances page will be Scaling up. Click the read replica and view the new storage space on the displayed Basic Information page to verify that the scale-up is successful.

   For RDS for MariaDB read replicas, you can view the detailed progress of the task on the Task Center page. For details, see section Task Center.