I used the Java API to build an application to do this. It should be similar, but you'll have to translate it yourself.
First, I will leave it to you to find a reference to the VM in question. I ended up with an object of type VM.
You can then see all of the attached disks (and controllers) using
List<VirtualDisk> disks = vm.getDisk();
You will need to walk through all of the disks. Keep a list of only the hard disks, not the controllers. Then create a new VirtualHard disk with only the attribute that are needed. When you get to the disk you want to resize, you will need to handle that as well.
List<VirtualDisk> hardDisks = new ArrayList<VirtualDisk>();
for (VirtualDisk disk : vm.getDisks())
{
if (disk.isHardDisk())
{
/*
* Create a new RASDType for each hard disk. only keep properties that are used for updating disks
* You must do this for every disk. Failing to send back a disk, even when it does not
* change, will cause the disk to be *removed* if the VM is powered off. It is a failure
* if the VM is powered on.
*/
BigInteger size = disk.getHardDiskSize();
RASDType diskResourceType = new RASDType();
diskResourceType.setElementName(disk.getItemResource().getElementName());
diskResourceType.setResourceType(disk.getItemResource().getResourceType());
diskResourceType.setInstanceID(disk.getItemResource().getInstanceID());
for (int i = 0; i < disk.getItemResource().getHostResource().size(); i++)
{
CimString resource = disk.getItemResource().getHostResource().get(i);
diskResourceType.getHostResource().add(resource);
if (disk.getItemResource().getElementName().getValue().equals(diskName))
{
for (QName key : resource.getOtherAttributes().keySet())
{
/* This is the section to change the size of the disk. For a simple test, increase by 1GB */
if (key.getLocalPart().equals("capacity"))
{
BigInteger newSize = size.add(new BigInteger("1024"));
String newSizeValue = newSize.toString();
resource.getOtherAttributes().put(key, newSizeValue);
}
}
}
}
/* Keep track of the disk so we can call the update method */
hardDisks.add(new VirtualDisk(diskResourceType));
}
}
Once you have the list of disks, call the update method. This is where the actual change takes place. Tune your waitForTask time values appropriately.
try
{
Task task = vm.updateDisks(hardDisks);
task.waitForTask(1000, 2000);
}
catch (TimeoutException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
Hopefully this gives you a decent starting point.
