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.
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