umount 报错

 在umount时报错:

[root@node1 ~]# umount /usb
umount: /usb: target is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))

原因:其他进程在使用

解决: 查找进程,杀掉，umount

[root@node1 ~]# fuser -m /usb
/usb: 25795c 25858c

[root@node1 ~]# kill -9 25795

[root@node1 ~]# umount /usb