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Storage: Copy-on-write cloning for rbd-backed disks for OpenStack Compute (nova)
Currently rbd-backed ephemeral disks are created by downloading an image from glance to a local file, then uploading that file into rbd. Even if the file is cached. uploading may take a long time, since 'rbd import' is synchronous and slow. If the image is stored in rbd already by glance, there's no need for any loc...