On Thu, Aug 25, 2016 at 7:06 PM, Ben Swartzlander <b...@swartzlander.org> wrote:
> Originally the NFS driver did support snapshots, but it was implemented by > just 'cp'ing the file containing the raw bits. This works fine (if > inefficiently) for unattached volumes, but if you do this on an attached > volume the snapshot won't be crash consistent at all. > > It was decided that we could do better for attached volumes by switching > to qcow2 and relying on nova to perform the snapshots. Based on this, the > bad snapshot implementation was removed. > > However, for a variety of reasons the nova-assisted snapshot > implementation has remained unmerged for 2+ years and the NFS driver has > been an exception to the rules for that whole time. > I am not sure to understand what you mean by "the nova-assisted snapshot implementation has remained unmerged for 2+ years". It looks merged to me [1] and several Cinder drivers dependent on it as far as I know. [1]: http://developer.openstack.org/api-ref-compute-v2.1.html#os-assisted-volume-snapshots-v2.1 -- <http://bit.ly/2aKbaTu>
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