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How To Unmount A Busy Mount Point (Device Busy) (Doc ID 1277636.1)

Last updated on AUGUST 04, 2018

Applies to:

Linux OS - Version Oracle Linux 4.4 and later
Linux x86
Linux x86-64
Linux Itanium

Goal

Most storage administration activities require that a file system be unmounted; all open files on the file system must be closed first or umount(8) will fail.  Resources such as lsof(8) may reveal the offending process, but if not alternatives to a system reboot may be preferred.

Solution

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In this Document
Goal
Solution
 Use Lazy umount(8)
 Use Forced Unmount
 Use /proc/<pid>/fd
 Examine The Kernel Data Structures
 Check For Loop-Mounted Devices
 As A Last Resort -- Reboot

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