arping can be a very handy tool when your main task is to migrate IP addresses across servers. When we migrate IP addresses, the switch or the networking device will cache the information and switch the packets to the old server, and thereby keeping the IP in the new server down.
Screen is a full-screen window manager that multiplexes a physical terminal between several processes (typically interactive shells). There is a scrollback history buffer for each virtual terminal and a copy-and-paste mechanism that allows moving text regions between windows.
It is very common in cPanel servers that they run out of disk space. It can be mainly because of the website users eats up the entire disk or the log files fills up or the backup fills up the entire folders.