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Cinder backend change from lvm to ceph

In grizzly, I have configured cinder using the default lvm as backend for a while. Some volumes have been created on lvm. Now, for some reason, I want to migrate the backend from lvm to ceph.

I would like to know how to migrate the existing volumes in lvm to ceph, since I can not find any instruction that can "export" the volumes from cinder (so that I can import it again after I switched the backend)?

Cinder backend change volume migrate from lvm to ceph

In grizzly, I have configured cinder using the default lvm as backend for a while. Some volumes have been created on lvm. Now, for some reason, I want to migrate the backend from lvm to ceph.

I would like to know how to migrate the existing volumes in lvm to ceph, since I can not find any instruction that can "export" the volumes from cinder (so that I can import it again after I switched the backend)?