Hi, I don't know of any way to resize an instance without downtime. The docs  confirm this, they state: > You can change the size of an instance by changing its flavor. This > rebuilds the instance and therefore results in a restart.  https://docs.openstack.org/nova/xena/user/resize.html Zitat von Parsa Aminian <p.aminian.server at gmail.com>: > hello > on openstack with ceph backend is it possible to live resize instances ? I > want to change flavor without any down time .