[libvirt-users] Create RBD Format 2 disk images with qemu-image

[Jon]

Hi Josh,

Thanks!  That is way too easy.

Best Regards,
Jon A

On Mon, Oct 21, 2013 at 10:34 AM, Josh Durgin <josh.durgin at inktank.com> wrote:
> On 10/17/2013 05:28 AM, Jon wrote:
>>
>> Hello,
>>
>> I would like to use RBD Format 2 images so I can take advantage of
>> layering.
>>
>> However, when I use "qemu-img create -f rbd rbd:data/foo 10G", I get
>> format 1 RBD images. (Actually, when I use the "-f rbd" flag, qemu-img
>> core dumps, but it looks like that feature may have been deprecated [1])
>>
>> Is there any way to have qemu-img create RBD Format 2 images or am I
>> better off using `rbd` to create the image then booting from the disk
>> and performing the install, etc.?
>
>
> If you're using recent cuttlefish or dumpling releases of ceph, you can
> add settings to ceph.conf to make qemu-img and anything else using
> librbd create format 2 images. In the [client] or [global] section of
> /etc/ceph/ceph.conf, add:
>
> rbd default format = 2
>
> Josh
>
>> Thanks for the assist.
>>
>> Best Regards,
>> Jon A
>>
>>
>> [1]
>> http://lists.ceph.com/pipermail/ceph-users-ceph.com/2013-June/002131.html
>>
>>
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>