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Scaling Up Storage Space

Scenarios

If the storage space is not enough for your workloads, you can scale up storage space of your DB instance.

If your storage space is less than 1 TB and its usage reaches 95% or the remaining space of storage of 1 TB or more drops to 50 GB, the DB instance status becomes Storage full and data cannot be written to databases. If your instance enters this state, scale up storage space to make the instance preserve at least 15% of its capacity to work properly.

For example, if a DB instance has 100 GB of storage and its status is Storage full, data can be written to the instance only after you increase the storage by at least (100/85% - 100) GB.

You can configure an alarm rule for the storage space usage, so you are alerted if the threshold is reached. 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 for MySQL Instance?

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

Constraints

  • The maximum allowed storage is 4,000 GB. There is no limit on the number of scale-ups.
  • When storage space is being scaled up, the DB instance is in Scaling up state and the backup tasks of the instance 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.
  • You cannot reboot or delete a DB instance that is being scaled up.
  • Storage space can only be scaled up, not down.

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 Service List. Under Database, click Relational Database Service.
  4. On the Instances page, locate the target DB instance and choose More > Scale Storage Space in the Operation column.

    Alternatively, click the instance name to go to the Basic Information page. In the Storage Space area, click Scale Storage Space.

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

    The minimum increment for each scaling is 10 GB.

  6. Confirm specifications.

    • If you need to modify your settings, click Previous.
    • If you do not need to modify your settings, click Submit.

  7. View the scale-up result.

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

    You can view the detailed progress and result of the task on the Task Center page. For details, see 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 and select a region and a project.
  3. Click Service List. Under Database, click Relational Database Service.
  4. 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.

    Alternatively, click the read replica name to go to the Basic Information page. In the Storage Space area, click Scale Storage Space.

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

    The minimum increment for each scaling is 10 GB.

  6. Confirm specifications.

    • If you need to modify your settings, click Previous.
    • If you do not need to modify your settings, click Submit.

  7. View the scale-up result.

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

    You can view the detailed progress and result of the task on the Task Center page. For details, see Task Center.

Parent topic: Instance Modifications
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