Restoring the operating system

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 actions:

  1. Perform a manual IPL.
  2. From the IPL or Install the System menu, select DST.
  3. From the Use DST menu, select the option to work with the DST environment.
  4. Select the option to change DST passwords.
  5. Select the option to change the operating system install security.
  6. Specify 1 (secure).
  7. Press F3 (exit) until you return to the IPL or Install the System menu.
  8. Complete the manual IPL.
Notes:
  1. If you no longer want to secure the installation of the operating system, follow the same steps and specify 2 (not secure).