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Hi sir thank you so much, I follow your instruction and check scheduler log the error as bellow:

2016-11-26 14:46:17.142 7636 DEBUG oslo_service.periodic_task [req-8cb71bb4-f42d-470d-bdfa-93ca1d1197fe - - - - -] Running periodic task SchedulerManager._run_periodic_tasks run_periodic_tasks /usr/lib/python2.7/dist-packages/oslo_service/periodic_task.py:215 2016-11-26 14:47:12.890 7636 DEBUG oslo_service.periodic_task [req-8cb71bb4-f42d-470d-bdfa-93ca1d1197fe - - - - -] Running periodic task SchedulerManager._expire_reservations run_periodic_tasks /usr/lib/python2.7/dist-packages/oslo_service/periodic_task.py:215 2016-11-26 14:47:18.143 7636 DEBUG oslo_service.periodic_task [req-8cb71bb4-f42d-470d-bdfa-93ca1d1197fe - - - - -] Running periodic task SchedulerManager._run_periodic_tasks run_periodic_tasks /usr/lib/python2.7/dist-packages/oslo_service/periodic_task.py:215 2016-11-26 14:47:51.599 7636 DEBUG oslo_concurrency.lockutils [req-1b860b2e-dbb0-4ad9-9141-21c6a3625208 - - - - -] Lock "host_instance" acquired by "nova.scheduler.host_manager.sync_instance_info" :: waited 0.000s inner /usr/lib/python2.7/dist-packages/oslo_concurrency/lockutils.py:273 2016-11-26 14:47:51.600 7636 INFO nova.scheduler.host_manager [req-1b860b2e-dbb0-4ad9-9141-21c6a3625208 - - - - -] Successfully synced instances from host 'SERVER-A8-C-U31'. 2016-11-26 14:47:51.601 7636 DEBUG oslo_concurrency.lockutils [req-1b860b2e-dbb0-4ad9-9141-21c6a3625208 - - - - -] Lock "host_instance" released by "nova.scheduler.host_manager.sync_instance_info" :: held 0.002s inner /usr/lib/python2.7/dist-packages/oslo_concurrency/lockutils.py:285 2016-11-26 14:48:14.898 7636 DEBUG oslo_service.periodic_task [req-8cb71bb4-f42d-470d-bdfa-93ca1d1197fe - - - - -] Running periodic task SchedulerManager._expire_reservations run_periodic_tasks /usr/lib/python2.7/dist-packages/oslo_service/periodic_task.py:215 2016-11-26 14:48:18.141 7636 DEBUG oslo_service.periodic_task [req-8cb71bb4-f42d-470d-bdfa-93ca1d1197fe - - - - -] Running periodic task SchedulerManager._run_periodic_tasks run_periodic_tasks /usr/lib/python2.7/dist-packages/oslo_service/periodic_task.py:215 2016-11-26 14:49:14.896 7636 DEBUG oslo_service.periodic_task [req-8cb71bb4-f42d-470d-bdfa-93ca1d1197fe - - - - -] Running periodic task SchedulerManager._expire_reservations run_periodic_tasks /usr/lib/python2.7/dist-packages/oslo_service/periodic_task.py:215 2016-11-26 14:49:18.141 7636 DEBUG oslo_service.periodic_task [req-8cb71bb4-f42d-470d-bdfa-93ca1d1197fe - - - - -] Running periodic task SchedulerManager._run_periodic_tasks run_periodic_tasks /usr/lib/python2.7/dist-packages/oslo_service/periodic_task.py:215 so I really confused by this problem.no error report from compute nova.