I try to copy a file to another system using NFS,
but it is very slow, i want to kill this process.
I tried a kill -9 on this cp process but still can't terminate,
without any error message.
Are there any method can terminate it, except reboot 
THANKS
There may be a more elegant way around this...
Stop NFS on the target server (will cause a stale mount on the server issueing the command)
kill the cp
unmount
restart NFS on remote server
remount