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Home/ Questions/Q 8891
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Alek Richter
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Alek RichterEnlightened
Asked: January 11, 20222022-01-11T10:21:51+00:00 2022-01-11T10:21:51+00:00

How to unmount a busy device

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I’ve got some samba drives that are being accessed by multiple users daily. I already have code to recognize shared drives (from a SQL table) and mount them in a special directory where all users can access them.

I want to know, if I remove a drive from my SQL table (effectively taking it offline) how, or even is, there a way to unmount a busy device? So far I’ve found that any form of umount does not work.

Ignoring the possibility of destroying data – is it possible to unmount a device that is currently being read?

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  1. Alek Richter Enlightened
    2022-01-11T10:22:10+00:00Added an answer on January 11, 2022 at 10:22 am

    YES!! There is a way to detach a busy device immediately – even if it is busy and cannot be unmounted forcefully. You may cleanup all later:

    umount -l /PATH/OF/BUSY-DEVICE
    umount -f /PATH/OF/BUSY-NFS (NETWORK-FILE-SYSTEM)

    NOTE/CAUTION

    These commands can disrupt a running process, cause data loss OR corrupt open files. Programs accessing target DEVICE/NFS files may throw errors OR could not work properly after force unmount.
    Do not execute above umount commands when inside mounted path (Folder/Drive/Device) itself. First, you may use pwd command to validate your current directory path (which should not be the mounted path), then use cd command to get out of the mounted path – to unmount it later using above commands.

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