On 19/11/14 15:21 +0800, henry hly wrote:
In the Previous BP [1], support for iscsi backend is introduced into glance. However, it was abandoned because of Cinder backend replacement.The reason is that all storage backend details should be hidden by cinder, not exposed to other projects. However, with more and more interest in "Converged Storage" like Ceph, it's necessary to expose storage backend to glance as well as cinder. An example is that when transferring bits between volume and image, we can utilize advanced storage offload capability like linked clone to do very fast instant copy. Maybe we need a more general glance backend location support not only with iscsi. [1] https://blueprints.launchpad.net/glance/+spec/iscsi-backend-store
Hey Henry, This blueprint has been superseeded by one proposing a Cinder store for Glance. The Cinder store is, unfortunately, in a sorry state. Short story, it's not fully implemented. I truly think Glance is not the place where you'd have an iscsi store, that's Cinder's field and the best way to achieve what you want is by having a fully implemented Cinder store that doesn't rely on Cinder's API but has access to the volumes. Unfortunately, this is not possible now and I don't think it'll be possible until L (or even M?). FWIW, I think the use case you've mentioned is useful and it's something we have in our TODO list. Cheers, Flavio -- @flaper87 Flavio Percoco
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