Initial Program Load

An Initial Program Load (IPL) resets a logical partition to prepare it for loading an operating system, and then loads the operating system using the specified IPL address and IPL parameter. The IPL address and IPL parameter are normally entered manually in the image activation profile or the load profile. However, a partition with I/O Configuration authority has the capability of dynamically changing an IPL address and IPL parameter. This could potentially cause an unintended operating system to be loaded into the partition. To prevent this, the 'Use dynamically changed address' and 'Use dynamically changed parameter' check boxes must not be selected in the Image or Load profile of an Isolated logical partition.