Does anyone has experience that one apache process cannot kill ('netstat -lnp|grep :80') and the error message tells the Address is already in use. Normally, simply kill the process ('kill -9 <pid>') to kill the process. However, it doesn't work on my case.
I found out it may due to my damn cluster external storage (DELL POWEREDGE 220).
I finally FIXED the problem after I start both servers. However, this problem cannot be solve if I only restart the problem server. Does anyone has experience, let's share