umount无法解除挂载

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问题：

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[root@zabbix /]# umount /dev/sdc1
umount: /data1: target is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1

解决：

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[root@zabbix /]# fuser -m /dev/sdc1
/dev/sdc1:           10246c
[root@zabbix /]# kill -9 10246

# 再umount就成功了
[root@zabbix /]# umount /dev/sdc1