This topic discusses the purpose of a load source for i5/OS® logical partitions and the placement rules that you must follow when installing the load source.
Each i5/OS logical partition must have one disk unit designated as the load source. The server uses the load source to start the logical partition. The server always identifies this disk unit as unit number 1.
You must follow placement rules when placing a load source disk unit in your managed system. Before adding a load source to your managed system or moving a load source within your managed system, validate the revised system hardware configuration with the LPAR Validation Tool (LVT), back up the data on the disks attached to the IOA, and move the hardware according to the LVT output.
For more information about the placement rules for load sources, see Load source placement rules for i5/OS logical partitions. For more information about the LVT, see LPAR Validation Tool (LVT).