I'm having the same issue on precise 12.04 (upgraded from lucid):
# virsh snapshot-create-as lucid-server backup --disk-only
error: internal error unable to execute QEMU command 'blockdev-snapshot-sync':
An undefined error has ocurred
libvirt log shows the same:
2012-06-07 14:54:46.723+0000: 3435: error :
qemuMonitorJSONCheckError:318 : internal error unable to execute QEMU
command 'blockdev-snapshot-sync': An undefined error has ocurred
Running Precise: 3.2.0-24-generic #39-Ubuntu SMP Mon May 21 16:52:17 UTC 2012
x86_64 x86_64 x86_64 GNU/Linux
# virsh --version
0.9.8
Same as Uri the virt machine has a qcow2 disk that I can snapshot ok
manually using qemu-img.
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='none'/>
<source file='/var/lib/libvirt/images/machines/lucid-server.qcow2'/>
<target dev='vda' bus='virtio'/>
<alias name='virtio-disk0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04'
function='0x0'/>
</disk>
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https://bugs.launchpad.net/bugs/1004606
Title:
virsh create-snapshot fails to create external snapshot
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