[libvirt] How to start a snapshot of Sheepdog volume in Libvirt

Hi all, I wanna test start a snapshot of Sheepdog volume in Libvirt. However, i cannot find a test description from https://github.com/collie/sheepdog/wiki/Libvirt. in Libvirt, which may be different from Sheepdog volume snapshot, right? Now, i have some questions like following. 1, What are the differences between Libvirt snapshot operations and Sheepdog Volume snapshot operations? The object of Libvirt snapshot is a file and Sheepdog volume is a block device, right? 2, Can we use Libvirt XML layout from http://libvirt.org/formatsnapshot.html to create a Sheepdog volume snapshot and start from it? If not, which Libvirt XML form should we use to create&start from this snapshot? 3, Is following XML layout right? <domain type='qemu'> <name>testvm</name> <memory>1048576</memory> <os> <type arch='x86_64'>hvm</type> </os> <devices> <disk type='network'> <source protocol="sheepdog" name="Alice:1"/> <target dev='hda' bus='ide'/> </disk> <graphics type='vnc' port='-1' autoport='yes'/> </devices> </domain> NOTE: Alice:1 is a snapshot of Alice. $ collie vdi list name id size used shared creation time object id -------------------------------------------------------------------- Bob 0 2.0 GB 1.6 GB 0.0 MB 2010-03-23 16:16 80000 Alice 0 256 GB 0.0 MB 0.0 MB 2010-03-23 16:21 c0000 s Alice 1 256 GB 0.0 MB 0.0 MB 2010-03-23 16:16 40000 Could anyone please give me some suggestions? Thanks in advance ;-) -- Thanks Harry Wei