[libvirt] Ejecting ISO from cdrom

Hello, how can I remove ISO image from cdrom in running domain, please? I tried procedure which is described on your wiki ( http://wiki.libvirt.org/page/QEMUSwitchToLibvirt#eject_DEV) but it doesn't work for me: divinus:/kvm/iso # virsh attach-disk --type cdrom --mode readonly leon.i-tux.cz "" hdc error: command 'attach-disk' requires <target> option divinus:/kvm/iso # virsh attach-disk --type cdrom --mode readonly leon.i-tux.cz "" --target hdc error: command 'attach-disk' requires <source> option divinus:/kvm/iso # virsh attach-disk --type cdrom --mode readonly leon.i-tux.cz --source "" --target hdc error: expected syntax: --source <string> Thank you, Jaromír Červenka