The attended IPL requires the presence of a system operator. To start an attended IPL, make sure the CPU's key lock is in the MANUAL position when you turn on the CPU. After some time, the system console shows a panel with options. The first option is for performing an IPL. Type ‘1’ and press Enter. The system displays the IPL Options panel, where you can set certain important values such as the system date and time. When you are done with the IPL Options panel, press Enter to proceed.
IPL continues and shows a series of informational messages until it presents the sign-on display at the system console. IPL is then complete.
Attended IPLs are not recommended because they are much more complicated than unattended IPLs, and they require the system operator to be present. However, sometimes attended IPLs are required (as when you upgrade to a new release of the operating system). As mentioned previously in this chapter, you should keep your CPU's key lock in either NORMAL or SECURE for unattended IPLs.
Not all systems have physical key locks. Many systems use a setting within the control panel to control MANUAL versus NORMAL mode.