Help Center/ Elastic Volume Service/ API Reference/ API/ Disk Management/ Expanding Capacity of an EVS Disk
Updated on 2025-08-20 GMT+08:00

Expanding Capacity of an EVS Disk

Function

This API is used to expand the capacity of a pay-per-use or yearly/monthly disk.

Constraints

If the status of the to-be-expanded disk is available, there are no restrictions.

If the status of the to-be-expanded disk is in-use, the restrictions are as follows:

  • A shared disk cannot be expanded, which means that the value of multiattach must be false.

  • The status of the server to which the disk attached must be ACTIVE, PAUSED, SUSPENDED, or SHUTOFF.

Calling Method

For details, see Calling APIs.

URI

POST /v2.1/{project_id}/cloudvolumes/{volume_id}/action

Table 1 Path Parameters

Parameter

Mandatory

Type

Description

project_id

Yes

String

Definition

The project ID.

For details about how to obtain the project ID, see Obtaining a Project ID.

Constraints

N/A

Range

N/A

Default Value

N/A

volume_id

Yes

String

Definition

The disk ID.

You can obtain it on the disk list page of the EVS console.

Constraints

N/A

Range

N/A

Default Value

N/A

Request Parameters

Table 2 Request header parameters

Parameter

Mandatory

Type

Description

X-Auth-Token

Yes

String

Definition

The user token.

You can obtain it by calling the IAM API. The value of X-Subject-Token in the response header is the user token.

Constraints

N/A

Range

N/A

Default Value

N/A

Table 3 Request body parameters

Parameter

Mandatory

Type

Description

bssParam

No

BssParamForResizeVolume object

Definition

The extended parameter of pay-per-use and yearly/monthly billing.

Constraints

N/A

Range

N/A

Default Value

N/A

os-extend

Yes

OsExtend object

Definition

The capacity expansion marker.

Constraints

N/A

Range

N/A

Default Value

N/A

Table 4 BssParamForResizeVolume

Parameter

Mandatory

Type

Description

isAutoPay

No

String

Definition

Whether to pay immediately.

Constraints

This parameter is only valid when the disk is billed on a yearly/monthly basis.

Range

  • true: indicates to pay immediately after an order is created. The system will automatically deduct charges from the account balance.

  • false: An order is not paid immediately after being created.

Default Value

false

Table 5 OsExtend

Parameter

Mandatory

Type

Description

new_size

Yes

Integer

Definition

The new disk capacity, in GiB.

Constraints

This parameter value must be greater than the original disk capacity and less than the maximum capacity allowed for a disk.

The maximum disk capacity:

  • Data disk: 32,768 GiB

  • System disk: 1,024 GiB

Range

N/A

Default Value

N/A

Response Parameters

Status code: 202

Table 6 Response body parameters

Parameter

Type

Description

job_id

String

Definition

The task ID. This parameter is returned when the disk is billed on a pay-per-use basis.

To query the task status, see Querying Task Status.

Range

N/A

order_id

String

Definition

The order ID. This parameter is returned when the disk is billed on a yearly/monthly basis.

If you need to pay for the order, see Paying Yearly/Monthly Product Orders.

Range

N/A

Status code: 400

Table 7 Response body parameters

Parameter

Type

Description

error

Error object

Definition

The error code returned if an error occurs. For the error codes and their meanings, see Error Codes.

Range

N/A

Table 8 Error

Parameter

Type

Description

code

String

Definition

The error code returned if an error occurs.

Range

For the error codes and their meanings, see Error Codes.

message

String

Definition

The error message returned if an error occurs.

Range

N/A

Example Requests

Expanding the capacity of an EVS disk (Set the disk capacity to 100 GiB and make the payment. Charges will be automatically deducted from your account balance.)

POST https://{endpoint}/v2.1/{project_id}/cloudvolumes/{volume_id}/action

{
  "os-extend" : {
    "new_size" : 100
  },
  "bssParam" : {
    "isAutoPay" : "true"
  }
}

Example Responses

Status code: 202

Accepted

{
  "job_id" : "70a599e0-31e7-49b7-b260-868f441e862b"
}

Status code: 400

Bad Request

{
  "error" : {
    "message" : "XXXX",
    "code" : "XXX"
  }
}

SDK Sample Code

The SDK sample code is as follows.

Java

Expanding the capacity of an EVS disk (Set the disk capacity to 100 GiB and make the payment. Charges will be automatically deducted from your account balance.)

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package com.huaweicloud.sdk.test;

import com.huaweicloud.sdk.core.auth.ICredential;
import com.huaweicloud.sdk.core.auth.BasicCredentials;
import com.huaweicloud.sdk.core.exception.ConnectionException;
import com.huaweicloud.sdk.core.exception.RequestTimeoutException;
import com.huaweicloud.sdk.core.exception.ServiceResponseException;
import com.huaweicloud.sdk.evs.v2.region.EvsRegion;
import com.huaweicloud.sdk.evs.v2.*;
import com.huaweicloud.sdk.evs.v2.model.*;


public class ResizeVolumeSolution {

    public static void main(String[] args) {
        // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
        // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
        String ak = System.getenv("CLOUD_SDK_AK");
        String sk = System.getenv("CLOUD_SDK_SK");
        String projectId = "{project_id}";

        ICredential auth = new BasicCredentials()
                .withProjectId(projectId)
                .withAk(ak)
                .withSk(sk);

        EvsClient client = EvsClient.newBuilder()
                .withCredential(auth)
                .withRegion(EvsRegion.valueOf("<YOUR REGION>"))
                .build();
        ResizeVolumeRequest request = new ResizeVolumeRequest();
        request.withVolumeId("{volume_id}");
        ResizeVolumeRequestBody body = new ResizeVolumeRequestBody();
        OsExtend osextendbody = new OsExtend();
        osextendbody.withNewSize(100);
        BssParamForResizeVolume bssParambody = new BssParamForResizeVolume();
        bssParambody.withIsAutoPay(BssParamForResizeVolume.IsAutoPayEnum.fromValue("true"));
        body.withOsExtend(osextendbody);
        body.withBssParam(bssParambody);
        request.withBody(body);
        try {
            ResizeVolumeResponse response = client.resizeVolume(request);
            System.out.println(response.toString());
        } catch (ConnectionException e) {
            e.printStackTrace();
        } catch (RequestTimeoutException e) {
            e.printStackTrace();
        } catch (ServiceResponseException e) {
            e.printStackTrace();
            System.out.println(e.getHttpStatusCode());
            System.out.println(e.getRequestId());
            System.out.println(e.getErrorCode());
            System.out.println(e.getErrorMsg());
        }
    }
}

Python

Expanding the capacity of an EVS disk (Set the disk capacity to 100 GiB and make the payment. Charges will be automatically deducted from your account balance.)

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# coding: utf-8

import os
from huaweicloudsdkcore.auth.credentials import BasicCredentials
from huaweicloudsdkevs.v2.region.evs_region import EvsRegion
from huaweicloudsdkcore.exceptions import exceptions
from huaweicloudsdkevs.v2 import *

if __name__ == "__main__":
    # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak = os.environ["CLOUD_SDK_AK"]
    sk = os.environ["CLOUD_SDK_SK"]
    projectId = "{project_id}"

    credentials = BasicCredentials(ak, sk, projectId)

    client = EvsClient.new_builder() \
        .with_credentials(credentials) \
        .with_region(EvsRegion.value_of("<YOUR REGION>")) \
        .build()

    try:
        request = ResizeVolumeRequest()
        request.volume_id = "{volume_id}"
        osextendbody = OsExtend(
            new_size=100
        )
        bssParambody = BssParamForResizeVolume(
            is_auto_pay="true"
        )
        request.body = ResizeVolumeRequestBody(
            os_extend=osextendbody,
            bss_param=bssParambody
        )
        response = client.resize_volume(request)
        print(response)
    except exceptions.ClientRequestException as e:
        print(e.status_code)
        print(e.request_id)
        print(e.error_code)
        print(e.error_msg)

Go

Expanding the capacity of an EVS disk (Set the disk capacity to 100 GiB and make the payment. Charges will be automatically deducted from your account balance.)

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package main

import (
	"fmt"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
    evs "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/evs/v2"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/evs/v2/model"
    region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/evs/v2/region"
)

func main() {
    // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak := os.Getenv("CLOUD_SDK_AK")
    sk := os.Getenv("CLOUD_SDK_SK")
    projectId := "{project_id}"

    auth := basic.NewCredentialsBuilder().
        WithAk(ak).
        WithSk(sk).
        WithProjectId(projectId).
        Build()

    client := evs.NewEvsClient(
        evs.EvsClientBuilder().
            WithRegion(region.ValueOf("<YOUR REGION>")).
            WithCredential(auth).
            Build())

    request := &model.ResizeVolumeRequest{}
	request.VolumeId = "{volume_id}"
	osextendbody := &model.OsExtend{
		NewSize: int32(100),
	}
	isAutoPayBssParam:= model.GetBssParamForResizeVolumeIsAutoPayEnum().TRUE
	bssParambody := &model.BssParamForResizeVolume{
		IsAutoPay: &isAutoPayBssParam,
	}
	request.Body = &model.ResizeVolumeRequestBody{
		OsExtend: osextendbody,
		BssParam: bssParambody,
	}
	response, err := client.ResizeVolume(request)
	if err == nil {
        fmt.Printf("%+v\n", response)
    } else {
        fmt.Println(err)
    }
}

More

For SDK sample code of more programming languages, see the Sample Code tab in API Explorer. SDK sample code can be automatically generated.

Status Codes

Status Code

Description

202

Accepted

400

Bad Request

Error Codes

See Error Codes.