I have an NFS-mounted directory on a Linux machine that has hung. I’ve tried to force an unmount, but it doesn’t seem to work:
$ umount -f /mnt/data $ umount2: Device or resource busy $ umount: /mnt/data: device is busy
If I type ‘mount‘, it appears that the directory is no longer mounted, but it hangs if I do ‘ls /mnt/data‘, and if I try to remove the mountpoint, I get:
$ rmdir /mnt/data rmdir: /mnt/data: Device or resource busy
Is there anything I can do other than reboot the machine?
You might try a lazy unmount: