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On 4/3/2017 2:21 PM, Mathieu Gagné wrote:
>
> I would like to share our private implementation (based on Mitaka):
> https://gist.github.com/mgagne/9402089c11f8c80f6d6cd49f3db76512
>
> The implementation makes it so Cinder leverages the existing Nova
> external-events endpoint to trigger the BDM update and iSCSI rescan on
> the host.

I like this a lot better than adding a new REST API to Nova to handle 
orchestrating this from the start.

>
> As always, the guest needs to update the partition table/filesystem if
> it wants to benefit from the new free space.
>
> Let me know if this is an implementation you want me to contribute upstream.
>

I didn't read the patch in detail, but if you're interested in 
contributing this upstream we could use a simple spec to start the 
process. Note that nova spec freeze for Pike is April 13.

-- 

Thanks,

Matt