# 全量迁移失败报错，关键词"The background process is unavailable. Maybe it has been killed manually or by the operating system. Please restart the task if possible or wait for restarting by itself within 5 minutes."
#### 场景描述
MongoDB-\>DDS实时迁移场景，全量迁移报错，日志提示信息：service DATAMOVE failed, cause by: The background process is unavailable. Maybe it has been killed manually or by the operating system. Please restart the task if possible or wait for restarting by itself within 5 minutes。
#### 可能原因
- 同步进程异常。
 
#### 处理方法
用户无需关注，DRS守护进程会自动恢复任务，迁移和同步业务不受影响，数据会断点续传。如果任务已异常，请在任务列表中，单击任务对应操作列的"续传"，重新提交任务。