I'm still trying to get xen working before Centos 6 and KVM just for experience. I seem to be able to do most of what I what with VMs, but I've run into another problem with CD/DVDs. I can get a DVD mounted on the host domain just fine, but when I try and attach-block to a running guest VM, the entire server reboots. I've tried many different commands versions based on what Google finds, but I'm not getting anywhere. I end up using scp to copy the data from the host to the guest. The guest is basically defined as a full virtualized domain. I'm using /dev/scd0 as the device (it's listed on the mount command) as both frontend and backend devices. And I've tried a few other devices as well, but the same result. Anyone know of a reason or fix, please? steve campbell