Function

This API is used to configure an autoscaling policy for storage space.

Constraints

This API supports GeminiDB Cassandra instances.
This API supports both pay-per-use and yearly/monthly instances.
If the instance status is not normal, autoscaling of storage space cannot be configured.

URI

PUT https://{Endpoint}/v3/{project_id}/instances/disk-auto-expansion

**Table 1** Path parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Project ID of a tenant in a region. To obtain this value, see Obtaining a Project ID.

Request Parameters

**Table 2** Request header parameters
Parameter	Mandatory	Type	Description
X-Auth-Token	Yes	String	User token.

**Table 3** Request body parameters
Parameter	Mandatory	Type	Description
instance_ids	Yes	Array of strings	IDs of the instances where autoscaling is enabled for storage space. Up to 50 instances are supported.
switch_option	No	String	Whether autoscaling is enabled. The value can be: on, indicating that autoscaling is enabled for storage space. off, indicating that autoscaling is disabled for storage space. The default value is on.
policy	No	Array of diskAutoExpansionPolicy	Autoscaling policies for storage space.

**Table 4** diskAutoExpansionPolicy
Parameter	Mandatory	Type	Description
threshold	No	Integer	Threshold for triggering autoscaling. GeminiDB Cassandra instances The value can be 80, 85, or 90. The default threshold is 90, indicating that autoscaling is enabled when the used storage space exceeds 90% of total storage space or the available storage space is less than 10 GB. GeminiDB Redis instances The value can be 60, 65, 70, 75, 80, 85, and 90. The default threshold is 80, indicating that autoscaling is enabled when the used storage space exceeds 80% of total storage space.
step	No	Integer	Autoscaling step (s%). GeminiDB Cassandra instances The value can be 10, 15, or 20, and the default value is 10. After autoscaling is enabled, storage space will increase by s% automatically. GeminiDB Redis instances The value can be 10, 15, or 20, and the default value is 20. When the storage usage is greater than 98%: If the total storage is less than 600 GB, the storage usage after autoscaling (used storage space/total storage space) will be less than 85%. If the total storage is greater than or equal to 600 GB, the system automatically scales up the storage space by over 90 GB. NOTE: GeminiDB Cassandra instances If the autoscaling step is not a multiple of 10, round it up. The value after the decimal point is rounded. The minimum step is 100 GB by default. GeminiDB Redis instances The value after the decimal point is rounded. The minimum step is 1 GB by default.
size	No	Integer	Storage limit in GB that autoscaling can increase storage space to. GeminiDB Cassandra instances Maximum amount that the system can automatically scale up an instance's storage space to must be greater than or equal to 100 GB of the current DB instance storage space. The value must be no less than the total storage of the instance and cannot exceed its maximum storage. Batch autoscaling does not allow you to specify an upper storage limit. The upper limit is the maximum storage defined by your instance specifications by default. GeminiDB Redis instances Autoscaling does not allow you to specify an upper storage limit. The upper limit is the maximum storage defined by your instance specifications by default.

Response Parameters

Status code: 204

No response parameters

Example Requests

Enabling the autoscaling policy of storage space

URI example

POST https://{Endpoint}/v3/619d3e78f61b4be68bc5aa0b59edcf7b/instances/disk-auto-expansion

Enabling autoscaling for storage space (Set threshold to 90, step to 10, and size to 600.)

{ 
  "instance_ids" : [ "93e4b3eda14349b1b870f72829bc3b9bin06" ], 
  "policy" : { 
    "threshold" : 90, 
    "step" : 10, 
    "size" : 600 
  } 
}

Disabling the autoscaling policy of storage space

URI example

POST https://{Endpoint}/v3/619d3e78f61b4be68bc5aa0b59edcf7b/instances/disk-auto-expansion

Disabling the autoscaling policy of storage space

{ 
  "instance_ids" : [ "93e4b3eda14349b1b870f72829bc3b9bin06" ], 
  "switch_option":"off"
}

Example Responses

Status code: 204

No Content

{ }

Status Codes

For details, see Status Codes.

Error Codes

For details, see Error Codes.

Configuring an Autoscaling Policy for Storage Space