Relational Database ServiceRelational Database Service

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Updated at: Apr 02, 2022 GMT+08:00

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 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 metric to learn about the storage space usage in a timely manner. For details, see Setting Alarm Rules.

For details about the causes and solutions of insufficient storage space, see What Should I Do If My Data Exceeds the Available Storage of an RDS DB Instance?

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

  • The maximum allowed storage is 4,000 GB. There is no limit on the number of scale-ups.
  • For primary/standby DB instances, scaling up the primary DB instance will cause the standby DB instance to also be scaled up accordingly.
  • The instance cannot be deleted during scaling.
  • Storage space can only be scaled up.
  • If you scale up a DB instance with disks 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 and select a region and a project.
  3. Click in the upper left corner of the page and choose Database > Relational Database Service. The RDS console is displayed.
  4. On the Instance Management 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 target DB instance to enter the Basic Information page. In the Storage Space area, click Scale.
    • If the storage space is full, locate the target DB instance on the Instance Management page and click Scale in the Status column.

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

    The minimum start value of each scaling is 10 GB. A DB instance can be scaled up only by a multiple of 10 GB. The allowed maximum storage space is 4,000 GB.

    The maximum storage space depends on the DB engine and instance specifications.

  6. Confirm specifications.

    • If you need to modify your settings, click Previous.
    • If you select the Pay-per-use billing mode and do not need to modify your settings, click Submit. If you select the Yearly/Monthly billing mode and do not need to modify your settings, click Pay Now.

  7. 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 Instance Management page will be Scaling up. Click the DB instance and view the utilization on the displayed Basic Information page to verify that the scale-up is successful.

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 and select a region and a project.
  3. Click in the upper left corner of the page and choose Database > Relational Database Service. The RDS console is displayed.
  4. On the Instance Management page, locate the target DB instance and click in front of it. Locate a 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 target DB instance to enter the Basic Information page. In the Storage Space area, click Scale.
    • If the storage space is full, locate the target DB instance on the Instance Management page and click Scale in the Status column.

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

    The minimum start value of each scaling is 10 GB. A read replica can be scaled up only by a multiple of 10 GB. The allowed maximum storage space is 4,000 GB.

    The maximum storage space depends on the DB engine and instance specifications.

  6. Confirm specifications.

    • If you need to modify your settings, click Previous.
    • If you select the Pay-per-use billing mode and do not need to modify your settings, click Submit. If you select the Yearly/Monthly billing mode and do not need to modify your settings, click Pay Now.

  7. View the scale-up result.

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

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