Instances can now be cold migrated or live migrated from hosts marked for maintenance. A new action button in the System > Hypervisors > Compute Host tab in the dashboard allows administrative users to set options for instance migration. Cold migration moves an instance from one host to another, reboots across the move, and its destination is chosen by the scheduler. This type of migration should be used when the administrative user did not select the 'live_migrate' option in the dashboard or the migrated instance is not running. Live migration moves an instance (with “Power state” = “active”) from one host to another, the instance doesn't appear to reboot, and its destination is optional (it can be defined by the administrative user or chosen by the scheduler). This type of migration should be used when the administrative user selected the 'live_migrate' option in the dashboard and the migrated instance is still running.