On 03/06/2013 04:12 PM, Mark Lehrer wrote: > >>> The change I made that helped the most was to disable NBD. You have >> >> Was that to disable injection at startup? > > No, NBD is just slow and unreliable for some reason. Disabling it made > my users happy. I haven't had time to find out why NBD is so horrible. > > Eventually I would like to see /var/lib/glance/images and > /var/lib/nova/instances/_base be on the same BTRFS file system and use > reflink copies.
Good call on that. `cp --reflink=auto` will do a reflink if possible or a normal copy otherwise. There are two related changes for grizzly. The first was with use_cow_images=True and force_raw_images=False, there is actually no transformation done to the image in _base and so one might be able to even `cp -l` in this case. That's a bit of a layering violation though, but it might be possible to handle within nova. The second is support for direct copy from glance to nova: https://github.com/openstack/nova/commit/20fca1a2 That isn't ideal at present as it uses shutil.copy() but it's probably easy to update to calling `cp --reflink=auto` thanks, Pádraig. _______________________________________________ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
