1)用fuser杀掉占用那个目录的进程
linux:~ # fuser -k /home/msgplus/msgplus/remote_dir
2）强制umount
linux:~ # umount -f /home/msgplus/msgplus/remote_dir
3）重新挂载
linux:~ # mount -t nfs 193.168.168.85:/home/msgplusdata /home/msgplus/msgplus/remote_dir -o nolock
