Samba is a service that allows Unix operating systems, such as AIX, to communicate with Windows-based networks. If the Samba service has locked up or is unresponsive, you can force it to restart by invoking the system's init script. This script is responsible for starting, stopping and managing system daemon services.
Log into your AIX system as the root user.
Click the "Terminal" option from the Common Desktop Environment if present; otherwise you will have logged directly into a console screen.
Type "/etc/rc.d/init.d/samba restart" without quotation marks, then press "Enter." The Samba service will now restart.