[openstack-dev] [Openstack-operators] [nova][cinder] Is there interest in an admin-api to refresh volume connection info?

Matt Riedemann mriedemos at gmail.com
Thu Sep 14 18:46:24 UTC 2017

On 9/13/2017 9:52 AM, Arne Wiebalck wrote:
>> On 13 Sep 2017, at 16:52, Matt Riedemann <mriedemos at gmail.com> wrote:
>> On 9/13/2017 3:24 AM, Arne Wiebalck wrote:
>>> I’m reviving this thread to check if the suggestion to address potentially stale connection
>>> data by an admin command (or a scheduled task) made it to the planning for one of the
>>> upcoming releases?
>> It hasn't, but we're at the PTG this week so I can throw it on the list of topics.
> That’d be great, thanks!
> --
> Arne Wiebalck

We talked about this at the PTG today, notes are in the Cinder etherpad 
[1], search for "API to refresh volume connection info".

We agreed that we don't need a new admin level API. We are already 
processing block device info in several operations that involve 
rebuilding the VM, such as cold migrate/resize, stop/start, 
suspend/resume, and rebuild. There is a little flag in those code paths 
which already exists to refresh the connection information for each 
block device mapping. We agreed to just change those code paths to set 
that flag to True to refresh the connection information per BDM. We also 
said we wouldn't fail the operation if the refresh fails for whatever 
reason, like if Cinder fails. This would not be a backportable change 
and will have a release note, but it's much more automatic than needing 
to add an entirely new API. If you want/need to refresh volume 
connection information without disruption, you'd have to live migrate 
the server instance.

[1] https://etherpad.openstack.org/p/cinder-ptg-queens




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