Max Max - 5 months ago 24
Linux Question

Umount a busy device

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 the 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 umount 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 umount a device that is currently being read?

Answer

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: 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.

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