ApsaraDB RDS:Configure automatic storage expansion

Background information

For more information, see Auto Scaling.

Usage notes

• If your RDS instance is a primary RDS instance and has read-only RDS instances, the system checks the storage capacity of each read-only RDS instance when automatic storage expansion is triggered for the primary RDS instance. If the storage capacity of a read-only RDS instance is less than the required storage capacity of the primary RDS instance after the automatic storage expansion, the system preferentially expands the storage capacity of the read-only RDS instance. After the storage capacity of each read-only RDS instance is expanded, the system automatically expands the storage capacity of the primary RDS instance.

• The storage capacity of specific RDS instances cannot be automatically expanded due to limitations on Windows drivers. In this case, we recommend that you update the minor engine versions of the RDS instances. For more information, see Update the minor engine version.

• After the storage capacity of an RDS instance is expanded, the storage capacity cannot be automatically reduced.

Billing rules

The billing rules of automatic storage expansion are the same as the billing rules of manual storage expansion for RDS instances. For more information, see Specification changes

Procedure

1. Go to the Instances page. In the top navigation bar, select the region in which the RDS instance resides. Then, find the RDS instance and click the ID of the instance.

2. In the Usage Statistics section of the page that appears, click Settings to the right of Automatic Storage Expansion.

   

3. Configure the parameters and click OK. The following table describes the parameters.

   Parameter	Description
   Automatic Storage Expansion	Specifies whether to enable or disable automatic storage expansion.
   Available Storage ≤	The threshold based on which automatic storage expansion is triggered. The threshold is expressed as a percentage. If the available storage reaches the threshold, the system expands the storage capacity of the RDS instance. Note The amount of storage that you can increase is the larger value of the following values: 5 GB. If the storage capacity of the RDS instance is less than 50 GB and the percentage of the available storage is less than 10% of the storage capacity, the step size for storage capacity expansion is adjusted to 10 GB. 15% of the current storage capacity of the RDS instance. The result is the nearest integer that is a multiple of 5.
   Maximum Storage Capacity:	The maximum storage capacity of the RDS instance after automatic storage expansion. The specified value must be greater than or equal to the current storage capacity of the RDS instance. If the RDS instance uses Enterprise SSDs (ESSDs), you can set this parameter to 32,000 GB. If the RDS instance uses standard SSDs, you can set this parameter to 6,000 GB.

View a storage expansion record

1. Go to the Instances page. In the top navigation bar, select the region in which the RDS instance resides. Then, find the RDS instance and click the ID of the instance.

2. In the Usage Statistics section, click Storage Expansion Records to the right of Automatic Storage Expansion to go to the Database Autonomy Service (DAS) console.

   

3. On the Autonomy Center page, set Type to Auto-Scaling Events to view the storage expansion records.

   

4. Click Details of the required scaling event to view the details of the storage expansion record.

   

References

• ApsaraDB RDS for SQL Server also supports manual storage expansion. For more information, see Change the specifications of an ApsaraDB RDS for SQL Server instance or Expand storage capacity.

• For more solutions to the issues about insufficient storage, see Troubleshoot insufficient storage space issues on an ApsaraDB RDS for SQL Server instance.

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