问题描述:

/dev/vdb1  挂载  /data/   容量不足，决定进行手动扩容。

先取消挂载，发生如下报错：

[root@VM_0_12_centos ujd]# umount /dev/vdb1 /data/

umount: /data: target is busy.

        (In some cases useful info about processes that use

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

umount: /data: target is busy.

        (In some cases useful info about processes that use

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

[root@VM_0_12_centos ujd]# umount /dev/vdb1 /data

umount: /data: target is busy.

        (In some cases useful info about processes that use

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

umount: /data: target is busy.

        (In some cases useful info about processes that use

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

解决方案：

关闭占用的进程，但是在使用fuser命令的时候显示没有这个命令

[root@VM_0_12_centos ujd]#  fuser -m  /dev/vdb1 

-bash: fuser: command not found   #如果提示这个，需要安装

# yum install -y psmisc

[root@VM_0_12_centos ujd]#  fuser -m  /dev/vdb1    

/dev/vdb1:           17448c

[root@VM_0_12_centos ujd]# ps aux | grep 17448

root       904  0.0  0.0 112812   972 pts/0    S+   00:10   0:00 grep --color=auto 1744

root     17448  0.0  0.0 116740  3424 pts/0    Ss   Aug24   0:00 -bash

[root@VM_0_12_centos ujd]# kill -9 17448

执行，kill -9 17448 ，会退出终端，重新登录。再执行，umount /dev/vdb1   /data/ 

最后可以使用df -h查看挂载情况，会发现已经取消挂载成功！