Scaling Up a Cluster Instance

You can scale up the storage space of an instance, and the backup space increases accordingly.

If the purchased storage space exceeds 600 GB and the available storage space is 18 GB, the database will be set to the read-only state when the disk is full.
If the purchased storage space is less than or equal to 600 GB and the storage usage reaches 97%, the database is set to the read-only state.

In addition, you can set alarm rules for the storage space usage. For details, see Configuring Alarm Rules.

For details about the causes and solutions of insufficient storage space, see High Storage Usage

Precautions

Scaling is available when your account balance is sufficient.
For cluster instances, only shard nodes can be scaled up, and mongos and config nodes cannot be scaled up.
Storage space can only be scaled up. It cannot be scaled down.
If you scale up a DB instance with disks encrypted, the expanded storage space will be encrypted using the original encryption key.
An instance cannot be scaled up if it is in any of the following statuses:
- Creating
- Changing instance class
- Adding node
- Deleting node
- Upgrading minor version
Services are not interrupted during scaling. The storage type cannot be changed.

Pricing

A pay-per-use instance is still billed on an hourly basis after the instance is scaled up.

If you scale up a yearly/monthly instance, you will pay price difference or get a refund.

Procedure

Log in to the management console.
Click in the upper left corner and select a region and a project.
Click in the upper left corner of the page and choose Databases > Document Database Service.
On the Instances page, click the cluster instance name.
In the Node Information area on the Basic Information page, click the shard tab, locate the shard node you want to scale, and click Scale Storage Space in the Operation column.

Figure 1 Scaling up storage space
On the displayed page, specify the desired amount of space to be added and click Next.

Figure 2 Scale Storage Space

Select at least 10 GB each time you scale up the storage, and the storage size must be multiples of 10 GB. The maximum amount of storage space is 2,000 GB.
On the displayed page, confirm the storage space.
- For yearly/monthly DB instances
  - If you need to modify your settings, click Previous to go back to the page for you to specify details.
  - If you do not need to modify your settings, click Submit to go to the payment page and complete the payment.
- For pay-per-use DB instances
  - If you need to modify your settings, click Previous to go back to the page for you to specify details.
  - If you do not need to modify the specifications, click Submit to scale up the storage space.
Check the results.
- This process takes about 3 to 5 minutes. The status of the DB instance in the instance list is Scaling up.
- In the upper right corner of the instance list, click to refresh the list. The instance status changes to Available.
- In the Node Information area on the Basic Information page, click the shard tab and check whether the scale up was successful.