[sheepdog-users] Problem with qcow2

[Hitoshi Mitake]

On Wed, Sep 28, 2016 at 12:41 AM, Cristian Del Carlo <
cristian.delcarlo at targetsolutions.it> wrote:

> Hi list,
>
> sorry if i have another question.
>
> I use sheepdog v0.9.3 and libvirt 1.2.17.
> I have problems with qcow2.
>
> I create the image with the command:
> qemu-img create -f qcow2 -o preallocation=metadata sheepdog:test2.qcow2 20G
>
> After the command i can check the image:
>
> # qemu-img info sheepdog:///test2.qcow2
> image: sheepdog:///test2.qcow2
> file format: qcow2
> virtual size: 20G (21474836480 bytes)
> disk size: unavailable
> cluster_size: 65536
> Format specific information:
>     compat: 1.1
>     lazy refcounts: false
>
> But when i start to install a linux vm ( with virtmanager 1.3.2 ) if i
> repeat the command i have the following :
>
> # qemu-img info sheepdog:///test2.qcow2
> image: sheepdog:///test2.qcow2
> file format: raw
> virtual size: 20G (21478375424 bytes)
> disk size: unavailable
>
> Even with "qemu-img convert" i have problem and i can work only with raw
> file.
>
> Where is the problem?
>

What is the motivation of using qcow2 format on sheepdog virtual block
device? It is a very rare use case so the functionality would have bugs. If
it is critical for you, could you open an issue on github?

Thanks,
Hitoshi


>
> I would like to use qcow2 to have the possibility to use the command
> "virsh snapshot-create --live vm".
>
> Thanks.
>
> Best regards,
>
>
> *Cristian Del Carlo*
>
>
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