挂载的云硬盘/数据盘卸载或更换路径的时候，提示：

umount: /data: target is busy.

(In some cases useful info about processes that use

the device is found by lsof(8) or fuser(1))

卸载磁盘：

$ umount /data

报错如下：

umount: /data: target is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))

则说明磁盘有程序在占用，需要检查占用的程序并关闭，可以直接使用如下命令查看：

fuser -m /data 
/data: 9265m 9276m 22762 22763 22764 22765 22766 22767

下边的都是进程号，再加上 -k参数可以直接杀掉：

fuser -k -m /data
/data:                9265m  9276m 22762 22763 22764 22765 22766 22767