Detaching a Disk from an ECS

Function

This API is used to detach a disk from an ECS.

Constraints

The system disk, the device name of which is /dev/sda, and user disks can be detached from an ECS only when the ECS is stopped. There are no requirements on UVP VMTools.

When an ECS is in the active state, pay attention to the following constraints:

Only data disks, the device name of which is not /dev/sda, can be detached from an ECS.
Make sure that UVP VMTools have been installed and enabled on the ECS. Otherwise, the uninstallation will fail.
For a Linux ECS, you need to log in to the ECS and run the umount command to disassociate the target disk from the file system. In addition, you need to ensure that no data is being written into or being read from the disk. Otherwise, the detachment will fail.

OSs supporting EVS disk detachment from a running ECS include two parts:

For the first part, see External Image File Formats and Supported OSs.

Table 1 lists the second part of supported OSs.

**Table 1** OSs supporting EVS disk detachment from a running ECS
OS	Version
CentOS	7.3 64bit
	7.2 64bit
	6.8 64bit
	6.7 64bit
Ubuntu Server	16.04 64bit
	14.04 64bit
	14.04.4 64bit

The forcible online disk detach function supports only VBD disks used by KVM ECSs.
For other types of disks used by Xen ECSs, BMSs, and KVM ECSs, this API supports only online disk detachment.
Disks which are forcibly detached online will use the disk drives and PCI addresses. Therefore, the disk drives and PCI addresses will not be assigned again.
After a disk is forcibly detached, it still occupies the disk quota of the ECS.
The system disk cannot be detached forcibly online.
When a file system is attached to a disk and the disk is detached forcibly online, users need to manually detach all file systems attached to the disk.
If logical partitions are created on the disk which is detached forcibly online, the logical partitions will become invalid.
After a disk is forcibly detached, you need to restart the ECS to clear the residual.

URI

DELETE /v2.1/{project_id}/servers/{server_id}/os-volume_attachments/{volume_id}{?delete_flag}

Table 2 describes the parameters in the URI.

**Table 2** Parameter description
Parameter	Mandatory	Description
project_id	Yes	Specifies the project ID. For details about how to obtain the ID, see Obtaining a Project ID.
server_id	Yes	Specifies the ECS ID.
volume_id	Yes	Specifies the volume ID.

Usage: DELETE /v2.1/{project_id}/servers/{server_id}/os-volume_attachments/{volume_id}?delete_flag=1

Table 3 describes the query parameters.

**Table 3** Query parameters
Parameter	Mandatory	Type	Description
delete_flag	No	Integer	Specifies whether to support forcible online disk detachment. The default value is 0. 1 indicates that the disk can be forcibly detached online.

Request

None

Response

None

Example Request

DELETE https://{endpoint}/v2.1/6fbe9263116a4b68818cf1edce16bc4f/servers/ab258e25-e351-47c7-b6e3-0749c5d9ed6a/os-volume_attachments/54667652-3029-4af8-9222-2d53066fd61c