Disabling an alternate installation device

If you need to disable an alternate installation device, follow these steps.

1. Use the system or logical partition control panel to set the mode to Manual. Then perform an attended initial program load (IPL) using the command: PWRDWNSYS OPTION(*IMMED) RESTART(*YES) IPLSRC(B).
   Note: Beginning in V6R1, the default value for the Power Down System (PWRDWNSYS) command is to display a confirmation. This can be changed by specifying *NO for the Confirm (CONFIRM) parameter: CONFIRM(*NO).
   Alternative: An alternative to this step is to select function 21 (Dedicated service tools). If you use this alternative, skip steps 2 and 9.
   Logical partition users: If you are using Hardware Management Console (HMC), see the Managing the Hardware Management Console (HMC) topic.
2. When the IPL or Install the System display appears, select option 3 (Use dedicated service tools (DST)) and press the Enter key.
3. The Dedicated Service Tools (DST) Sign On display appears. Sign on using the QSECOFR user profile.
4. The Use Dedicated Service Tools (DST) menu appears. From the Use Dedicated Service Tools (DST) menu, perform the following tasks:
   1. Select option 5 (Work with DST Environment).
   2. Select option 2 (System devices) on the Work with DST Environment display.
   3. Select option 5 (Alternate installation device) on the Work with System Devices display.
5. At the Select Alternate Installation Device display, press F2 (Deselect device).
6. You should see the following message at the bottom of the display:

   Alternate installation device deselected

7. Press F3 (Exit) to return to the Use Dedicated Service Tools (DST) display.
8. Press F3 (Exit) again. The Exit Dedicated Service Tools (DST) display appears. Type 1 (Exit DST) and press the Enter key.
9. The next display you see is the IPL or Install the System display. Type 1 (Perform an IPL) and press the Enter key to complete the procedure.