I looked a bit more into this and more and more get the impression that
this particular setup has not and is not supported.

Ben, did snapshots with type volume storage definitions ever work for
you? And the other question would be whether it is possible to convert
the currents guests and the process of creating new guests to use the
type=file format of storage definitions.

A bit more background: snapshots are only supported on file-backed
disks. When defining a disk as type=volume, the internal structure that
holds the disk stores both the volume name (type=volume) and the path
(type=file) in the same source element. But all the code for snapshots
assumes a local path in there. For type=volume this would require
additional checking (since there are pools that do not contains file
backed volumes) and re-direction (to resolve the volume name into a
path). None of this is present even in the recent releases of libvirt.
So it might be a restriction that has not been documented well.

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https://bugs.launchpad.net/bugs/1417288

Title:
  unable to create snapshot

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