[libvirt-users] snapshots and qcow2

[Laszlo Hornyak]

Hi,

I ran into a strange behavior with libvirt snapshots. I have some vms
running with thin-provisioned qcow2 disk images (libvirt 1.1.3 with fedora
20).
* When I create a snapshot on the VM, the qcow file suddenly grows big,
somewhat bigger than the maximum size of the disk.
* When I delete the snapshot, the allocated disk space is not freed up, the
qcow image remains the same size. However, if I create a new snapshot
again, it will take the previous snapshot's space. This does not seem to be
very well documented in qemu and the man page, manual, online
documentation, wiki etc does not mention it.

Is there a way to free up the space allocated for snapshots?

Thank you,
Laszlo

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