Thanks for the feedback! I need to look closer to Cinder Agent specs.
Walter, Hope, I could help you and Duncan with making this. Regards, Ivan Kolodyazhny On Wed, Sep 17, 2014 at 2:32 AM, Mathieu Gagné <mga...@iweb.com> wrote: > On 2014-09-16 7:03 PM, Walter A. Boring IV wrote: > > The upside to brick not making it in Nova is that it has given us some >> time to rethink things a bit. What I would actually >> like to see happen now is to create a new cinder/storage agent instead >> of just a brick library. The agent would run on every cinder node, >> nova node and potentially ironic nodes to do LUN discovery. Duncan and I >> are looking into this for the Kilo release. >> >> > Thanks for reviving this idea [1] [2] [3]. I wish to say that I like it > because months ago, we found use cases for it and wished cinder-agent was a > thing. > > One use case we have is the need to rescan an iSCSI target used by a Nova > instance after an in-use volume has been extended in order to reflect its > new size at the hypervisor level. > > During the implementation, we quickly saw the code duplication hell that > exists between both Nova and Cinder, all implementing iSCSI management. Due > to the amount of work required to introduce a cinder-agent and due to my > inexperience with OpenStack back then, we went down an other path instead. > > We addressed our needs by introducing a Cinder->Nova interaction through > custom code in Cinder and an API extension in Nova: Cinder triggers the > rescan through the Nova API (instead of cinder-agent). > > With cinder-agent, Cinder would be able to remotely trigger a rescan of > the iSCSI target without relying on a custom API extension in Nova. I feel > this implementation would be much more resilient and reduce code > duplication in the long term. > > I'm sure there is more use cases. This is mine. > > [1] https://blueprints.launchpad.net/cinder/+spec/cinder-agent > [2] https://lists.launchpad.net/openstack/msg19825.html > [3] https://etherpad.openstack.org/p/cinder-agent > > -- > Mathieu > > > _______________________________________________ > OpenStack-dev mailing list > OpenStack-dev@lists.openstack.org > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev >
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