On Tue, 2017-03-28 at 09:13 -0500, Robert Nichols 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.
I did create it with the above line. Clearly I didn't understand where it was, or perhaps I inadvertently deleted it. Currently 'qemu-img snapshot -l <filename>' gives no output, so it looks like it's gone assuming it was ever there. (BTW the "no such file or directory" message could not be less helpful). > 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. I'm going to try to attach it to another Windows instance to see if it can be repaired. Otherwise, it looks like I'm screwed. Thanks for the information. poc _______________________________________________ users mailing list -- users@lists.fedoraproject.org To unsubscribe send an email to users-le...@lists.fedoraproject.org
