[libvirt-users] Excluding RAW disk from snapshot

I have an oVirt engine node that currently runs the system on a qcow2 based virtual disk, and an NFS export volume on RAW. I'd like to take a snapshot before a somewhat risky upgrade of oVirt and can't with the raw image attached. Looking at the documentation for the snapshot XML, I created this XML file for the snapshot <domainsnapshot> <name>20120802</name> <description>oVirt 3.1 upgrade</description> <disks> <disk name='vda' snapshot='yes' /> <disk name='vdb' snapshot='no' /> </disks> </domainsnapshot> When I try the snapshot I get this error... # virsh snapshot-create dc-vmarchitect dc-vmarchitect_ss.xml error: argument unsupported: unable to handle disk requests in snapshot This occurred on both libvirt-0.9.4 and after an upgrade to libvirt-0.9.10 Current system is CentOS 6.2 with 6.3 versions of qemu/libvirt qemu-kvm-0.12.1.2-2.295.el6_3.1.x86_64 qemu-img-0.12.1.2-2.295.el6_3.1.x86_64 libvirt-client-0.9.10-21.el6_3.3.x86_64 libvirt-python-0.9.10-21.el6_3.3.x86_64 libvirt-0.9.10-21.el6_3.3.x86_64 According to the documentation, http://libvirt.org/formatsnapshot.html, the disk features should be available since 0.9.5. Is this still missing or have I created an invalid XML? Thanks - Trey