umount时提示device is busy,如下:
# umount /data/disk1
umount: /data/disk1: device is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))
这时,可以使用fuser命令来查看:
# fuser -vm /data/disk1
USER PID ACCESS COMMAND
/data/disk1: root 17330 F...m dataserver
即可知道是pid=17330的dataserver占用了该目录
停止对应服务,即可umount成功.