Hi List At the moment, we replace a filer and we have to move the VM's to another filer. We have a lot of problems with it. Sometime we have to restart the engine, sometime we have to move the image arround and sometimes we don't have a chance to remove the snapshots. When the VM is running, most of the time the snapshot remove never starts. Now, i found these errors every second in the engine.log since today: 2016-05-11 23:25:29,102 ERROR [org.ovirt.engine.core.bll.CommandsFactory] (DefaultQuartzScheduler_Worker-90) [] Error in invocating CTOR of command 'RemoveDiskSnapshots': null 2016-05-11 23:25:29,102 ERROR [org.ovirt.engine.core.utils.timer.SchedulerUtilQuartzImpl] (DefaultQuartzScheduler_Worker-90) [] Failed to invoke scheduled method invokeCallbackMethods: null 2016-05-11 23:25:30,104 ERROR [org.ovirt.engine.core.bll.CommandsFactory] (DefaultQuartzScheduler_Worker-66) [] Error in invocating CTOR of command 'RemoveDiskSnapshots': null 2016-05-11 23:25:30,104 ERROR [org.ovirt.engine.core.utils.timer.SchedulerUtilQuartzImpl] (DefaultQuartzScheduler_Worker-66) [] Failed to invoke scheduled method invokeCallbackMethods: null 2016-05-11 23:25:31,105 ERROR [org.ovirt.engine.core.bll.CommandsFactory] (DefaultQuartzScheduler_Worker-76) [] Error in invocating CTOR of command 'RemoveDiskSnapshots': null 2016-05-11 23:25:31,105 ERROR [org.ovirt.engine.core.utils.timer.SchedulerUtilQuartzImpl] (DefaultQuartzScheduler_Worker-76) [] Failed to invoke scheduled method invokeCallbackMethods: null I try everything, but i can't find the problem. Anyone who have an idea, where i have to search? Thank's for help. Ivo