Folks, Just a quick heads-up that this review[1] if accepted will result in glance taking a soft dependency on pysendfile. The import is conditional, so where pysendfile is unavailable on a particular distro, the 'glance add' command will simply fallback to the pre-existing chunk-at-a-time logic. Russell Bryant is working on packaging pysendfile for Fedora[2], so that base will be covered. I also spoke to the maintainer of pysendfile and there are ogoing efforts in his community to update the python-sendfile packages for Debian/Ubuntu - the existing packages[3] were based on the now-obsolete 1.4.x version of pysendfile. Cheers, Eoghan [1] https://review.openstack.org/#change,3863 [2] http://www.spinics.net/linux/fedora/fedora-cloud/msg01224.html [3] http://packages.ubuntu.com/search?keywords=python-sendfile