[libvirt] libvirt external snapshot error

Peter Krempa pkrempa at redhat.com
Mon Nov 23 12:10:48 UTC 2015

On Mon, Nov 23, 2015 at 15:04:55 +0300, Vasiliy Tolstov wrote:
> 2015-11-23 14:43 GMT+03:00 Peter Krempa <pkrempa at redhat.com>:
> > If you insist on using --live you also have to specify --memspec to
> > point to a location where the memory snapshot is saved. Btw, --live and
> > --disk-only are basically mutually exclusive since --disk-only implies
> > that the memory state should not be saved, whereas --live is used when
> > the memory state is saved.
> >
> > Additionally a disk-only snapshot is always considered "live" since it
> > usually doesn't require pausing of the VM.
> So, i'm try to modify command to virsh snapshot-create-as 40219
> --no-metadata --disk-only     --diskspec sda,file=/test.raw
> but also have error:
> error: unsupported configuration: external snapshot file for disk sda
> already exists and is not a block device: /test.raw

The file should not exist prior to the snapshot. If you want to
pre-create it (with correct size and format), you need to specify
--reuse-external in that case. Virsh manual already documents that:

   If --reuse-external is specified, and the snapshot XML requests an
   external snapshot with a destination of an existing file, then the
   destination must exist and be pre-created with correct format and
   metadata. The file is then reused; otherwise, a snapshot is refused
   to avoid losing contents of the existing files.
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