Hi All, If you are using XCP/XenServer with DevStack, you might run into some kernel lockup issues, while you are dding to your cinder volumes, if you are using the file backed/loopbacked cinder backend. The bug is described here: https://bugs.launchpad.net/cinder/+bug/1023755 We worked around this by using a separate virtual drive to back cinder volumes. I pushed a patch recently, so that devstack supports this kind of configuration: https://review.openstack.org/31977 Cheers, Mate -- Mate Lakat