When you perform a manual IPL on your system, the IPL or Install
the System menu provides an option to install the operating system.
The dedicated service tools (DST) function provides the ability to require
anyone using this menu option to enter the DST security password. You can
use this to prevent someone from restoring an unauthorized copy of the operating
system. To secure the installation of your operating system, do the following:
- Perform a manual IPL.
- From the IPL or Install the System menu, select DST.
- From the Use DST menu, select the option to work with the DST environment.
- Select the option to change DST passwords.
- Select the option to change the operating system install security.
- Specify 1 (secure).
- Press F3 (exit) until you return to the IPL or Install the System menu.
- Complete the manual IPL and return the keylock to its normal position.
Note: - If you no longer want to secure the installation of the operating system,
follow the same steps and specify 2 (not secure).
- You can also prevent installation of the operating system by keeping your
keylock switch in the normal position and removing the key.
Refer to Manage security
information for more information.