On Tue, Mar 28, 2017 at 8:13 AM, Robert Nichols <rnicholsnos...@comcast.net> wrote:
> On 03/27/2017 12:31 PM, Patrick O'Callaghan wrote: > >> I have a QEMU image snapshot: >> >> $ sudo qemu-img info /var/lib/libvirt/images/Windows10.qcow2 >> image: /var/lib/libvirt/images/Windows10.qcow2 >> file format: qcow2 >> virtual size: 20G (21474836480 bytes) >> disk size: 196K >> cluster_size: 65536 >> backing file: /home/poc/Win10/win10.qcow2 >> backing file format: qcow2 >> Format specific information: >> compat: 1.1 >> lazy refcounts: true >> refcount bits: 16 >> corrupt: false >> >> However when I try to restore the virtual disk I get: >> >> $ sudo qemu-img snapshot -a /var/lib/libvirt/images/Windows10.qcow2 >> /home/poc/Win10/win10.qcow2 >> qemu-img: Could not apply snapshot '/var/lib/libvirt/images/Windows10.qcow2': >> -2 (No such file or directory) >> >> I must be doing something obviously wrong, but can't see what it is. >> Hints would be appreciated. >> > > What you have is not a snapshot. A snapshot is created with "qemu-img > snapshot -c <snapshot-name> <imagename>", and that is _not_ a separate > file. That "<snapshot-name>" is not a file name but just a tag to identify > one of possibly several snapshots within that "<imagename>" file. > > What you made was a copy-on-write image using /home/poc/Win10/win10.qcow2 > as a backing file. You can make changes in > /var/lib/libvirt/images/Windows10.qcow2 > and not affect the backing file, but the backing file _must_not_be_changed_ > during the lifetime of that dependent image. That c-o-w image cannot be > restored to its original state. The way you do that is to throw it away > and create a new one with the same backing file. > > -- > Bob Nichols "NOSPAM" is really part of my email address. > Do NOT delete it. > > _______________________________________________ > users mailing list -- users@lists.fedoraproject.org > To unsubscribe send an email to users-le...@lists.fedoraproject.org > Ahh interesting. Thanks for this info Patrick.
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