Hi Daniel,
libvirt never directly stores its XML files when talking to Xen - it always uses one of the two Xen formats as the master database instead. ...snipp... On Xen> 3.0.3 libvirt uses the native Xen APIs, which result in the files being stored in /var/lib/xend/domains instead.
So if I change the files in /var/lib/xend/domains manually, the changes should stick, right? I tried that and occasionally the files revert to the previous version. Could it be that the respective VM (or virt-manager?) must not be running while changing the domain configuration files? Does libvirt or xen store the domain configuration in memory while the machine/gui is running and write it back to the configuration file when the machine/gui shuts down? Thank, Arik