集群全部是HDD硬盘。集群不断地发起STORAGE_MEDIUM_MIGRATE任务，但是都失败了。
be的磁盘IO每10分钟就上升到100%。重启be之后，一直处在100%。
问题
- 磁盘全部是HDD，也没有做冷热的配置，为什么会发起STORAGE_MEDIUM_MIGRATE任务。
- 怎么解决这个问题，be恢复正常状态
I0613 19:22:25.563711 33845 task_worker_pool.cpp:263] successfully submit task|type=STORAGE_MEDIUM_MIGRATE|signature=2940876|queue_size=1
W0613 19:22:25.605175 33124 task_worker_pool.cpp:1925] failed to migrate storage medium|signature=2940876|tablet_id=2940876|error=[NOT_IMPLEMENTED_ERROR]cannot copy remote files, rowset_id=0200000000062bbfda43fc1e15e17910451213c24a4535a6
I0613 19:22:26.704102 33845 task_worker_pool.cpp:263] successfully submit task|type=STORAGE_MEDIUM_MIGRATE|signature=2711369|queue_size=1
W0613 19:22:26.704710 33124 task_worker_pool.cpp:1925] failed to migrate storage medium|signature=2711369|tablet_id=2711369|error=[NOT_IMPLEMENTED_ERROR]cannot copy remote files, rowset_id=020000000155eee7a1406119ce435c5778e13f0b3a5625a6
I0613 19:22:27.847658 33845 task_worker_pool.cpp:263] successfully submit task|type=STORAGE_MEDIUM_MIGRATE|signature=2942155|queue_size=1
W0613 19:22:27.861388 33124 task_worker_pool.cpp:1925] failed to migrate storage medium|signature=2942155|tablet_id=2942155|error=[NOT_IMPLEMENTED_ERROR]cannot copy remote files, rowset_id=0200000000078860da43fc1e15e17910451213c24a4535a6
I0613 19:22:28.994135 33845 task_worker_pool.cpp:263] successfully submit task|type=CLONE|signature=2891741|queue_size=1
I0613 19:22:28.994212 33845 task_worker_pool.cpp:263] successfully submit task|type=CLONE|signature=2891745|queue_size=2
I0613 19:22:28.994397 33845 task_worker_pool.cpp:263] successfully submit task|type=CLONE|signature=2891753|queue_size=2
I0613 19:22:28.994412 33123 task_worker_pool.cpp:1860] get clone task. signature=2891741
I0613 19:22:28.994467 33122 task_worker_pool.cpp:1860] get clone task. signature=2891745
I0613 19:22:28.994580 33845 task_worker_pool.cpp:263] successfully submit task|type=CLONE|signature=2891749|queue_size=1
I0613 19:22:28.994614 33845 task_worker_pool.cpp:263] successfully submit task|type=STORAGE_MEDIUM_MIGRATE|signature=308677|queue_size=1
I0613 19:22:28.994626 33121 task_worker_pool.cpp:1860] get clone task. signature=2891753
I0613 19:22:28.994638 33122 task_worker_pool.cpp:1880] successfully clone tablet|signature=2891745|tablet_id=2891745
I0613 19:22:28.994794 33123 task_worker_pool.cpp:1880] successfully clone tablet|signature=2891741|tablet_id=2891741
W0613 19:22:29.008424 33124 task_worker_pool.cpp:1925] failed to migrate storage medium|signature=308677|tablet_id=308677|error=[NOT_IMPLEMENTED_ERROR]cannot copy remote files, rowset_id=020000000000201fa1406119ce435c5778e13f0b3a5625a6
I0613 19:22:29.018570 33122 task_worker_pool.cpp:1860] get clone task. signature=2891749
I0613 19:22:29.018644 33122 task_worker_pool.cpp:1880] successfully clone tablet|signature=2891749|tablet_id=2891749
I0613 19:22:30.126960 33108 task_worker_pool.cpp:1610] successfully publish version|signature=19417125|transaction_id=19417125|tablets_num=4|cost(s)=38
I0613 19:22:30.127159 33110 task_worker_pool.cpp:1610] successfully publish version|signature=19417133|transaction_id=19417133|tablets_num=4|cost(s)=17
I0613 19:22:30.138404 33845 task_worker_pool.cpp:263] successfully submit task|type=STORAGE_MEDIUM_MIGRATE|signature=2941463|queue_size=1
W0613 19:22:30.138948 33124 task_worker_pool.cpp:1925] failed to migrate storage medium|signature=2941463|tablet_id=2941463|error=[NOT_IMPLEMENTED_ERROR]cannot copy remote files, rowset_id=02000000000709fcda43fc1e15e17910451213c24a4535a6
I0613 19:22:30.369024 33121 task_worker_pool.cpp:1880] successfully clone tablet|signature=2891753|tablet_id=2891753
I0613 19:22:31.256538 33845 task_worker_pool.cpp:263] successfully submit task|type=STORAGE_MEDIUM_MIGRATE|signature=2942539|queue_size=1
W0613 19:22:31.257126 33124 task_worker_pool.cpp:1925] failed to migrate storage medium|signature=2942539|tablet_id=2942539|error=[NOT_IMPLEMENTED_ERROR]cannot copy remote files, rowset_id=020000000007a7b8da43fc1e15e17910451213c24a4535a6
