On Tue, Mar 28, 2017 at 8:13 AM, Robert Nichols <rnicholsNOSPAM@xxxxxxxxxxx> 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.
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Ahh interesting. Thanks for this info Patrick.
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