[libvirt] [PATCH] rbd: Use rbd_create3 to create RBD format 2 images by default

Wido den Hollander wido at widodh.nl
Thu Sep 12 16:28:08 UTC 2013



On 09/12/2013 04:12 PM, Daniel P. Berrange wrote:
> On Thu, Sep 12, 2013 at 11:27:10AM +0200, Wido den Hollander wrote:
>> This new RBD format supports snapshotting and cloning. By having
>> libvirt create images in format 2 end-users of the created images
>> can benefit of the new RBD format.
>
> What's the compatibility like here. If one node creates a v2 image,
> can a host which only knows v1 still use that v2 image for booting
> guests ?
>

Only very old clients won't be able to open v2 images when they only 
support v1.

Ceph is however a fast moving project where almost all users are on the 
most recent versions of Ceph due to new features and bug fixes.

Wido

> Daniel
>




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