I'm starting a xen domU using xm create config.cfg. Within the config file are a number of physical block devices (LVs) which are added to the guest and can be accessed fine when it boots. However, at a point in the future I need to be able to hot unplug one of these disks using the xm block-detach command. This command, however, requires the vbd id of the device to be detached and I can't find a way to find the device id for a particular disk 'plugged in' at start up. Any help is much appreciated!