CentOS7卸载硬盘报错：umount: /data: target is busy.

问题描述

umount: /data: target is busy.

问题分析

硬盘正在被使用，不能被卸载。

解决方案

1. 查看哪些程序在使用硬盘

[root@localhost ~]# lsof /data/
COMMAND     PID    USER   FD   TYPE DEVICE  SIZE/OFF       NODE NAME
mysqld    15655 polkitd  cwd    DIR    8,1      4096 1612787333 /var/lib/mysql
mysqld    15655 polkitd    3uW  REG    8,1  50331648 1612787342 /var/lib/mysql/ib_logfile0
mysqld    15655 polkitd    8uW  REG    8,1  50331648 1612787341 /var/lib/mysql/ib_logfile1
mysqld    15655 polkitd    9uW  REG    8,1  79691776 1612787340 /var/lib/mysql/ibdata1
mysqld    15655 polkitd   10uW  REG    8,1  12582912 1610613099 /var/lib/mysql/ibtmp1

2. 关闭相关进程

[root@localhost ~]# kill -9 15655

3. 卸载硬盘

[root@localhost ~]# umount /data