[libvirt-users] Snapshot without volumes temporarily

Hello, I want to do a snapshot which the VM has volumes. But I want to skip the volume check when I do the snapshot. (Which means I want to do a snapshot without detaching the volume) So I try to write a snapshot XML refer by http://libvirt.org/formatsnapshot.html as following: vda is my VM basic disk (qcow2) vdb is a volume (raw) ================ t1.xml =============== <domainsnapshot> <disks> <disk name='vda' snapshot='internal'> <source file='/var/lib/libvirt/VM1/disk' /> </disk> <disk name='vdb' snapshot='no' /> </disks> </domainsnapshot> ===================================== with this command: # virsh snapshot-create VM1 --xmlfile t1.xml and get the message: # error: argument unsupported: unable to handle disk requests in snapshot My environment is Libvirt 0.9.8, Qemu 1.0.0 on Ubuntu12.04.02 I try to do this action before at libvirt 0.9.2 QEMU 0.14.1 on Ubuntu 11.10 before with following commands, It's success. Step1. I copy the XML from /etc/libvirt/qemu/VM1.xml to VM1.xml.backup Step2. I edit the VM1.xml to remove the disk tag which is create by volume Step3. do virsh command: virsh snapshot-create VM1 Step4. Move VM1.xml.backup to VM1.xml It's success on libvirt 0.9.2. But on 0.9.8 It doesn't work. Because libvirt will check the setups from memory not the XML file in /etc/libvirt/qemu/ What could I do with libvirt 0.9.8? Thanks in advance.