Open Stack

He is mentioning about the Cinder side: https://review.openstack.org/#
/c/147186/

On Fri, Aug 26, 2016 at 7:01 AM, Jordan Pittier <jordan.pittier at scality.com>
wrote:

>
>
> On Thu, Aug 25, 2016 at 7:06 PM, Ben Swartzlander <ben at 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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