Update an Independent Disk

You can update an independent disk to increase its capacity or change the storage profile that the disk uses.

Use this procedure to update an independent disk when it is not attached to a virtual machine.

When an independent disk is attached to a virtual machine, it is listed in the virtual machine's VirtualHardwareSection along with the other disks that are not independent of the virtual machine. You can update an attached independent disk by using the reconfigureVm operation. See Update Multiple Sections of a Virtual Machine.

Prerequisites

This operation requires the rights included in the predefined vApp Author role or an equivalent set of rights.Verify that you are logged in to the vCloud Air Compute Service as an Account Administrator.

Procedure

Retrieve a reference to the independent disk.
You can use a query like this one to retrieve references to all independent disks to which you have access:
```
GET https://vcloud.example.com/api/query?type=disk&format=references
```
Retrieve the XML representation of the independent disk.
Use one of the references returned by the query shown in Step 1, as shown in this example:
Request:
```
GET https://vcloud.example.com/api/disk/128
```
The response is a Disk element.
Response:
```
<Disk
   ...
   name="500GB-SCSI"
   href="https://vcloud.example.com/api/disk/128"> 
   ...
</Disk>
```
Verify that the disk is not attached to a virtual machine.
Use the query service. A query like this one returns information about the returned in Step 2.
```
GET https://vcloud.example.com/api/query?type=adminDisk&filter=name==500GB-SCSI
```
The response includes an isAttached attribute. If this attribute has a value of false, the disk is not attached, and you can update it with a PUT request as shown in Update an Independent Disk. Otherwise, you can update it by using the reconfigureVm operation to update the appropriate Item in the VirtualHardwareSection of the virtual machine to which the disk is attached.
Modify the Disk element you retrieved in Step 2. See Update an Independent Disk.

Request bodies must contain all required elements and attributes, even if you are not changing their values. Because optional elements and attributes typically revert to default values if they are omitted or empty, it is a best practice to include optional elements in request bodies that modify existing objects. Link elements and href attributes from responses do not need to be included in modified sections. Some elements and attributes are read-only and cannot be modified. See the schema reference for details.
Update the Disk with your modifications.
1. In the retrieved Disk element, find the Link element where rel="edit".
2. Make a PUT request to the URL in that link's href attribute value, and supply the modified section as the request body.

Example: Update an Independent Disk

This example updates the independent disk created in Create an Independent Disk to change the storage profile.

Request:

PUT https://vcloud.example.com/api/disk/128
Content-Type: application/vnd.vmware.vcloud.disk+xml
...
<?xml version="1.0" encoding="UTF-8"?>
<Disk
   xmlns="http://www.vmware.com/vcloud/v1.5"
   size="500000000000"
   name="500GB-SCSI">
   <Description>Independent Disk</Description>
   <StorageProfile
      type="application/vnd.vmware.vcloud.vdcStorageProfile+xml"
      name="gold"
      href="https://vcloud.example.com/api/vdcStorageProfile/3" />
   <Owner type="application/vnd.vmware.vcloud.owner+xml">
      <User
         type="application/vnd.vmware.admin.user+xml"
         href="https://vcloud.example.com/api/admin/user/120" />
   </Owner>
</Disk>

The response is a Task element that tracks the update operation. When the task is complete, the object is updated.

Response:

202 Accepted
Content-Type: application/vnd.vmware.vcloud.task+xml
...
<Task ... operation="Updating Independent disk 500GB-SCSI (128)" ...>
...
</Task>