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On 07/28/2015 09:00 AM, Kekane, Abhishek wrote:
> Hi Devs,
> 
>  
> 
> There is an NFS backend driver for cinder, which supports only limited
> volume handling features. Specifically, "snapshot" and "cloning"
> features are missing.
> 
>  
> 
> Eric Harney has proposed a feature of "NFS driver snapshot" [1][2][3],
> which was approved on Dec 2014 but not implemented yet.
> 
>  
> 
> [1] blueprint https://blueprints.launchpad.net/cinder/+spec/nfs-snapshots
> 
> [2] cinder-specs https://review.openstack.org/#/c/133074/  - merged for
> Kilo but moved to Liberty
> 
> [3] implementation https://review.openstack.org/#/c/147186/  - WIP
> 
>  
> 
> As of now [4] nova patch is a blocker for this feature.
> 
> I have tested this feature by applying [4] nova patch and it is working
> as per expectation.
> 
>  
> 
> [4] https://review.openstack.org/#/c/149037/
> 

so [4] is actually related to the following bug (it is linked on the
review):

https://bugs.launchpad.net/nova/+bug/1416132

The proposed patch is, as was discussed in some details on the patch -
not the right approach for several reasons.

I have added a comment on the bug [1] outlining what I think is the
right solution here, however - it is far from a trivial change.

Let me know if the comment on the bug makes sense and if I need to add
more information.

I will try to devote some time to fixing this, as I believe this is
causing us a lot more problems in the gate on an ongoing basis (see [2]
for example), but the discussion in the bug should be enough to get
anyone else who may want to pick it up on the right path to making progress!

Best,
N.

[1] https://bugs.launchpad.net/nova/+bug/1416132/comments/8
[2] https://bugs.launchpad.net/nova/+bug/1445021