Help Center/ Elastic Cloud Server/ API Reference/ APIs/ Disk Management/ Querying Details of a Single Disk Attached to an ECS

Updated on 2026-03-19 GMT+08:00

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Querying Details of a Single Disk Attached to an ECS

Function

This API is used to query details of a single disk attached to an ECS.

This API supports checking fine-grained permissions for enterprise projects. For details, see ecs:cloudServers:showServerBlockDevice.

Debugging

You can debug this API in API Explorer.

Authorization

Each account has all of the permissions required to call all APIs, but IAM users must have the required permissions specifically assigned.

If you are using role/policy-based authorization, see the required permissions in Permissions and Supported Actions.
If you are using identity policy-based authorization, the permissions listed below are required.

Action	Access Level	Resource Type (*: required)	Condition Key	Alias	Dependencies
ecs:cloudServers:showServerBlockDevice	read	instance *	-	ecs:cloudServers:get	-

URI

GET /v1/{project_id}/cloudservers/{server_id}/block_device/{volume_id}

Table 1 describes the parameters in the URI.

**Table 1** Parameter description
Parameter	Mandatory	Description
server_id	Yes	Definition Specifies the ECS ID in UUID format. Constraints N/A Range N/A Default Value N/A
project_id	Yes	Definition Specifies the project ID. For details about how to obtain the ID, see Obtaining a Project ID. Constraints N/A Range N/A Default Value N/A
volume_id	Yes	Definition Specifies the EVS disk ID in UUID format. Constraints N/A Range N/A Default Value N/A

Request

None

Response

Table 2 describes the response parameters.

**Table 2** Response parameters
Parameter	Type	Description
volumeAttachment	Object	Definition Specifies the disk attached to an ECS. For details, see Table 3. Range N/A

**Table 3** **volumeAttachment** parameters
Parameter	Type	Description
serverId	String	Definition Specifies the ECS ID in UUID format. Range N/A
volumeId	String	Definition Specifies the EVS disk ID in UUID format. Range N/A
id	String	Definition Specifies the mount ID, which is the same as the EVS disk ID. The value is in UUID format. Range N/A
size	Integer	Definition Specifies the EVS disk size, in GiB. Range N/A
device	String	Definition Specifies the drive letter of the EVS disk, displayed as the device name on the console. For details, see How Do I Obtain My Disk Device Name in the ECS OS Using the Device Identifier Provided on the Console? Range N/A
pciAddress	String	Definition Specifies the PCI address. Range N/A
bootIndex	Integer	Definition Specifies the EVS disk boot sequence. Range 0 indicates the system disk. Non-0 indicates a data disk.
bus	String	Definition Specifies the disk bus type. Range virtio scsi

Example Request

Query information about a specified disk attached to an ECS.

GET https://{endpoint}/v1/{project_id}/cloudservers/{server_id}/block_device/{volume_id}

Example Response

{
    "volumeAttachment": {
        "pciAddress": "0000:02:01.0",
        "volumeId": "a26887c6-c47b-4654-abb5-asdf234r234r",
        "device": "/dev/vda",
        "serverId": "4d8c3732-a248-40ed-bebc-539a6ffd25c0",
        "id": "a26887c6-c47b-4654-abb5-asdf234r234r",
        "size": "40",
        "bootIndex": 0,
        "bus":"virtio"
    }
}