On 4/3/2017 5:30 PM, Matt Riedemann wrote:
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.
One thing we'd have to consider with this is if nova is new enough to
handle the external event. I think we'd bump the microversion in the
compute API and then on the cinder side, it asks the compute API for
available versions and if the version available is new enough to handle
the event, then you move forward, else you fail on the cinder API side
since you know nova can't handle the external event.
--
Thanks,
Matt
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