Question: I'm using OpenVZ to create containers and it creates a folder for each container to store its files. I stopped the creation of a container before it gets completed, so it created a folder for that container, but when I try to remove that folder using `rm -rf`, I get the `'Device or resource busy'` error, but when I do `'lsof <container folder>'` or `'fuser <container folder>'`, it returns nothing, even when I do `umount <container folder>` nothing happens. So I'm not sure which process or device is using it. How can I remove this folder?

Answer: 
I did several umount commands and it worked well for me. For some reason, the folder has been mounted several times by openvz, so I had to umount it several times to be able to remove it.
```
$ umount /directory/

=> umount(/directory/): Resource busy -- try 'diskutil unmount'

```

So I tried with 

```
diskutil unmount /directory/

```

and it works for me.