Hi. I'm try to boot from http cdrom and can't do that in case of scsi: <disk type='network' device='cdrom'> <driver name='qemu' type='raw' cache='unsafe'/> <source protocol='http' name='/vps/rescue-4.5.2'> <host name='xx.xx' port='80'/> </source> <backingStore/> <target dev='sdb' bus='scsi'/> <readonly/> <alias name='scsi0-0-0-1'/> <address type='drive' controller='0' bus='0' target='0' unit='1'/> </disk> but in case of ide: <disk type='network' device='cdrom'> <driver name='qemu' type='raw' cache='unsafe'/> <source protocol='http' name='/vps/rescue-4.5.2'> <host name='xx.xx' port='80'/> </source> <backingStore/> <target dev='hda' bus='ide'/> <readonly/> <alias name='ide0-0-0'/> <address type='drive' controller='0' bus='0' target='0' unit='0'/> </disk> all works fine. libvirt - 1.2.10 qemu - 2.0.0 seabios - 1.7.5