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September 16, 2019

Force Umount if Busy

If device is busy and you can’t umount it, try it with -l option (lazy unmount). Or you can force it.

# standard
umount /mnt/data
# lazy umount
umount -l /mnt/data
# force
umount -f /mnt/data

# standard umount /mnt/data # lazy umount umount -l /mnt/data # force umount -f /mnt/data

Lazy unmount is safer since it will detach immediately and clean up all references to the file system. Force is a bit more drastic.

Filed Under: Linux Tagged With: busy, device, force, lazy, umount, unable

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I'm Ulysses, a Cloud Engineer at Cardinal Health based in Columbus, Ohio. I’m a certified AWS Solutions Architect. This website is my way of documenting the things I have learned in the Cloud. When off the grid, I enjoy riding my electric skateboard. I have surfed, snowboarded and played the saxophone in the past. I hope you will find this site helpful. It's powered by WordPress and hosted in AWS LightSail.

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