Cannot umount a busy driver.

If you haven't tried to force umount by -f try it:

umount -f /mnt/your-mounted-drive

Now in case using -f it still gives error. Try this:

apt-get install psmisc

Now user fuser command like below:

fuser -c /mnt/your-mounted-drive
 /mnt/your-mounted-drive/: 2510c 11086

It outputs the pid of the processes using this volume. The extra character at the end of pid will give some extra info. ( c in 2510c)

c - the process is using the file as its current working directory

m - the file is mapped with mmap

o - the process is using it as an open file

r - the file is the root directory of the process

t - the process is accessing the file as a text file

y - this file is the controlling terminal for the process

Kill these processes:

kill -9 2510 11086

Now umount it:

umount /mnt/your-mounted-drive

#umount #NFS #fuser #psmisc

You can use the below command to do it all:

fuser -ickv /mnt/your-mounted-drive

Where:
- parameter k kills the offending process,

- while v shows in advance the process and its user

- i asks you for confirmation.

NOTE: if some process resists, then try again with fuser -ickv -9

#linux #fuser #umount