An affinity logical partition is a special type of logical partition. Affinity logical partitions are system-defined resource divisions. The memory and processors of each affinity logical partition have a close physical proximity to each other. This helps maximize each partition's performance. Only some managed systems are equipped to use affinity logical partitions.
When affinity logical partitions are created, the system defines the amount of memory and the number of processors to assign to each affinity logical partition. The user still determines the I/O requirements for each of these partitions, however.