Configuring run levels on multiuser systems

You can change run levels on multiuser systems.

Check the /etc/inittab file to confirm that the run level to which you are changing supports the processes that you are running.
The getty process is particularly important, since it controls the terminal line access for the system console and other logins. Ensure that the getty process is enabled at all run levels.
Use the wall command to inform all users that you intend to change the run level and request that users log off.
For more information about the wall command, see wall.
Use the smit telinit fast path to access the Set System Run Level menu.
Type the new run level in the System RUN LEVEL field.
Press Enter to implement all of the settings in this procedure.
The system responds by telling you which processes are terminating or starting as a result of the change in run level and by displaying the message:
```
INIT: New run level: n
```
where n is the new run-level number.