Each logical partition must have one disk unit designated as the load source.
The load source contains the Licensed Internal Code and the configuration data for the logical partitions. The server uses the load source to start the logical partition. The server always identifies this disk unit as unit number 1.
The logical partition configuration data on the load source of the primary partition is the master copy. The server uses this copy to check the integrity of the configuration data that it maintains on the load source of each logical partition.
Any time the load source of a logical partition is erased, the logical partition configuration data must be recovered. On a secondary partition, the server automatically rewrites the data by using the master copy from the primary partition. On the primary partition, you must manually recover the configuration data.
When you move the load source for a logical partition to a different server or different logical partition as a nonconfigured disk unit, you need to clear its configuration data. This recovery action corrects configuration data problems.