POST /v1.0/1234/instances/5d891bb6-6c61-4b0a-8b85-26f4ee461c9d/action HTTP/1.1
User-Agent: python-example-client
Host: ord.databases.api.rackspacecloud.com
X-Auth-Token: 2eeb3252-0164-40f5-8fb7-85df5faa2698
Accept: application/xml
Content-Type: application/xml

<?xml version="1.0" ?>
<resize xmlns="http://docs.openstack.org/database/api/v1.0">
	<volume size="4"/>
</resize>