Share via

Update Data Disk


The Update Data Disk operation updates the configuration of the specified data disk that is attached to the specified Virtual Machine.


The Update Data Disk request may be specified as follows. Replace <subscription-id> with the subscription ID, <cloudservice-name> with the name of the cloud service, <deployment-name> with the name of the deployment, <role-name> with the name of the Virtual Machine, and <lun> with the logical unit number of the disk.


Request URI


URI Parameters


Request Headers

The following table describes the request headers.

Request Header



Required. Specifies the version of the operation to use for this request. This header should be set to 2012-03-01 or higher.

Request Body

The format of the request body is as follows:

<DataVirtualHardDisk xmlns="" xmlns:i="">

The following table describes the elements of the request body.

Element name



Optional. Specifies the caching behavior of the data disk.

Possible values are:

  • None

  • ReadOnly

  • ReadWrite

The default value is None.


Required. Specifies the name of the data disk to update. This value is only used to identify the data disk to update and cannot be changed.


Required. Specifies the Logical Unit Number (LUN) for the data disk. You can use this element to change the LUN for the data disk. If you do not want to change the LUN, specify the existing LUN as the value for this element.

Valid LUN values are 0 through 31.


Required. Specifies the location of the VHD that is associated with the data disk. This value is only used to identify the data disk to update and cannot be changed.



The response includes an HTTP status code, a set of response headers, and a response body.

Status Code

A successful operation returns status code 202 (Accepted).

Response Headers

The response for this operation includes the following headers. The response may also include additional standard HTTP headers.

Response Header



A value that uniquely identifies a request made against the management service.

Response Body