Hi, all The qemu does not support monitor_command drive_add and drive_del in json mode. These two commands are important because attaching/detaching commands need them. AFAIK, if we use libvirt provided by RHEL6(not upstream), we connect to qemu in json mode. So, it is important to make qemu to support these monitor commands in json mode. Markus Armbruster(armbru@xxxxxxxxxx) said these commands are designed badly, and he has started to work on saner commands some time ago: http://lists.nongnu.org/archive/html/qemu-devel/2011-02/msg02042.html He suggested us to use human monitor passthrough in the meantime. Should we modify libvirt to use human monitor passthrough command to support attaching/detaching device before the saner commands are ready? -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list