Resize (or Server resize) is the ability to change the flavor of a server, thus allowing it to upscale or downscale according to user needs. In order for this feature to work properly, some underlying virt layers may need further configuration; this section describes the required configuration steps for each hypervisor layer provided by OpenStack.
To get resize to work with XenServer (and XCP), please refer to the Dom0 Modifications for Resize/Migration Support section.