Re: [libvirt-users] Creating a snapshot from a KVM VM fails
Hi,
Thanks a lot for the answer.
An internal snapshot of a VM requires that the VM has at least one
disk
using a QCOW2 volume or similar. The memory state is saved in that
image. Your VM has only a RAW disk image and thus it can't be used for
internal snapshot.
Ok, that makes sense...
You can either use an external snapshot (the memory image is stored
separately), but the support for external snapshots isn't finished yet
(they can't be reverted automatically).
How can I create an external snapshot?
The second option is to convert your VM to a qcow2 image file..
...
> <disk type='network' device='disk'>
> <driver name='qemu' type='raw' cache='none'/>
> <source protocol='rbd' name='one/one-5-5-0'/>
> <target dev='hda' bus='ide'/>
> <alias name='ide0-0-0'/>
> <address type='drive' controller='0' bus='0'
target='0'
> unit='0'/>
> </disk>
As you can see, I'm using RBD as storage backend. So converting to a
qcow2 is not an option. Any idea how to achieve internal snapshots using
RBD as storage backend? F.e. attach an additional qcow2 disk just for
the snapshot?
Cheers,
Tobias