I got a client which is mounted on a NFS server. Now when the server restarts it gets a new ip addr. So in order to reconnect the client I first unmount (unmount -f/mnt/billing) the NFS and then I try to mount it again. But the client does not allow me to do so it says: device is busy.
I tried unmount -l, it works in the cosole, but not in the script.
Your advice would be helpful.