Overview

As data accumulates, your GeminiDB DynamoDB-Compatible instance may run out of storage. You can scale up the storage space of your instance to accommodate data growth. As data volumes decrease, you can scale down storage to avoid low database node utilization and resource waste. Table 1 lists the scaling methods supported by GeminiDB DynamoDB-Compatible instances.

**Table 1** Scaling methods
Method	Supported Deployment Type	Description
Manually Scaling Up Storage of a GeminiDB DynamoDB-Compatible Instance	Classic Cloud native	You can specify how much storage space needs to be added. To scale up classic storage, you need to select at least 1 GB each time. The value must be an integer. To scale up cloud native storage, you need to select at least 10 GB each time. The value must be an integer multiple of 10.
Configuring Storage Autoscaling for a GeminiDB DynamoDB-Compatible Instance	Classic Cloud native	If storage usage exceeds the configured threshold, autoscaling will be triggered. The storage is scaled up by a percentage you specify. The added storage space is the current storage space multiplied by the scaling increment.
Manually Scaling Down Storage of a GeminiDB DynamoDB-Compatible Instance	Classic Cloud native	You can specify the amount of storage to be reduced. To scale down classic storage, you need to select at least 1 GB each time. The value must be an integer. To scale down cloud native storage, you need to select at least 100 GB each time. The value must be an integer multiple of 10. The target storage after scale-down must be at least 125% of the used storage. The value is rounded up.

Manually Scaling Up Storage Space

For example, if the original storage of a cluster instance with classic storage is 24 GB and 8 GB is added, the total storage becomes 32 GB.

Figure 1 Manually scaling up storage space
Click to enlarge

Configuring Storage Autoscaling for an Instance

For example, if the original storage of a cluster instance with classic storage is 24 GB, the storage usage threshold for triggering autoscaling is 80%, and the autoscaling increment is 10%, the storage is automatically scaled up when usage reaches or exceeds 80%. The scale-up amount is 2.4 GB (24 GB × 10%), rounded up to 3 GB, bringing the total storage to 27 GB (24 + 3).

Figure 2 Automatically scaling up storage space
Click to enlarge