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Cloned from launchpad blueprint https://blueprints.launchpad.net/nova/+spec/nova-image-zero-copy. Description: This blueprint aims to add zero-copy support for images. The idea is to take advantage of the following existing features: 1. Nova's image cache 2. Glance image's direct_url The idea is to use the direct_url value from images to delay the image download as much as possible and without passing through Glance's API service. Once the image has been downloaded, it'll be cached by the hypervisor's imagecache (if implemented). Specification URL (additional information): https://etherpad.openstack.org/p/nova-glance-zero-copy