[openstack-dev] [Glance] Recall for previous iscsi backend BP

Flavio Percoco flavio at redhat.com
Wed Nov 19 08:00:56 UTC 2014

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
>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.


Flavio Percoco
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