[libvirt] attach-disk (cdrom) requirements

Hello, if the guest is powered off and I run the following command to attach a CD-ROM virsh attach-disk QEmu-fedora-i686-3 myCDROM.iso hdc --driver file --type cdrom --mode readonly I got error: libvir: QEMU error : internal error cannot attach device on inactive domain Is it a requirement to have the guest running to attach a CDROM ? Is there a way to attache a CDROM to a guest powered off with VIRSH I have Compiled against library: libvir 0.6.0 Using library: libvir 0.6.0 Using API: QEMU 0.6.0 Running hypervisor: QEMU 0.10.0 Consider that the above command works if the guest is running. Thanks in advance, Francesco