Can’t unmount error: Device or resource is busy in Linux/CentOS

Sometimes when you try to unmount a mounted filesystem in Linux, it gives an error that can not unmount device, device or resource busy. Now to deal with such situation do the following:

Suppose a partition /dev/sdb1 is mounted to directory /storage and you are trying to unmount it.

[root@localhost ~]# umount /storage

umount: /storage: device is busy
umount: /storage: device is busySolution : Use the lsof command to find the pid and the open files used by /storage
[root@localhost ~]# lsof | grep /storage
esd       23711   root  cwd       DIR       8,17      4096    1228794 /storage720p BRRip x264 – HDMiCRO by Mr. KickASS
esd       23711   root    3r      REG       8,17 942758269    1229005 /storage/ – HDMiCRO by Mr. KickASS/ Mr. KickASS.mp4

Once you get the pid just kill it.
[root@localhost ~]# kill -9 23711
[root@sandbox1 ~]# umount /storage

About Manish Jha

Hi All I am Manish Kumar Jha aka Alex Hunt. I am currently working in Iono,Inc as Cloud Solutions Architect. I have around 8 Years of IT experience and have exposure on VMware vSphere, vCloud Director, RHEL and modern data center technologies like Cisco UCS and Cisco Nexus 1000v and NSX. If you find any post informational to you please press like and share it across social media and leave your comments if you want to discuss further on any post. Disclaimer: All the information on this website is published in good faith and for general information purpose only. I don’t make any warranties about the completeness, reliability and accuracy of this information. Any action you take upon the information you find on this blog is strictly at your own risk. The Views and opinions published on this blog are my own and not the opinions of my employer or any of the vendors of the product discussed.
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