Umount:/var:device is busy

Remove mount display device is busy

This problem occurs when there is a process present on the current mount point

[Root@zabbix ~]# umount/dev/mapper/vg_zabbix-logvol02
umount:/var:device is busy.
        (In some cases useful info about processes, use the
         device are found by lsof (8) or fuser (1))

Solve:

Use the following name to view the processes running above the mount point and then stop, as follows:

[Root@zabbix ~]# fuser-m-v/dev/mapper/vg_zabbix-logvol02
                     USER        PID ACCESS COMMAND
/dev/mapper/vg_ ZABBIX-LOGVOL02:
                     root       1534 f ... auditd
                     root 1556 f .... rsyslogd
                     root       2024 f .... crond

Fuser-m–k/dev/mapper/vg_zabbix-logvol02

Note: Above is the process of killing the mount point directly above using kill, it is recommended to use daemon to stop the process.

[Root@zabbix ~]#/etc/init.d/rsyslog stop
shutting down system logger:                               [  OK  ]
[Root@zabbix ~]# Fuser-m-v/dev/mapper/vg_zabbix-logvol02
                     USER        PID ACCESS COMMAND
/dev/mapper/vg_zabbix-logvol02:
                     Root       1534 f ... auditd
                     root       2024 f ... crond
[Root@zabbix ~]#/etc/init.d/crond Stop
stopping Crond:                                            [  OK  ]
[Root@zabbix ~]#/etc/init.d/auditd stop
stopping auditd:                                           [  OK  ]
[Root@zabbix ~]# fuser-m-v/dev/mapper/vg_zabbix-logvol0
cannot stat/dev/mapper/vg_zabbix-logvol0:no such file o R directory
cannot stat/dev/mapper/vg_zabbix-logvol0:no such file or directory
cannot stat/dev/mapper/vg_ Zabbix-logvol0:no such file or directory

Re-Uninstall

[Root@zabbix ~]# Umount/dev/mapper/vg_zabbix-logvol02

Reference Link: http://www.cnblogs.com/dkblog/archive/2012/07/18/2597192.html