Micro-partitioning
Micro-partitioning is the ability to allocate fractions of a CPU to an LPAR. Each LPAR must have a minimum of 0.1 CPUs. CPU resource can be allocated in intervals of 0.01 CPUs.
Partitions using micro-partitioning technology are referred to as shared processor partitions (SPLPARs). An LPAR must be created as either a dedicated or shared processor partition, and you cannot mix shared and dedicated processors in one partition. However, you can create a shared processor partition with, for example, an entitlement of 2.25 CPUs. All micro-partitions use CPUs from a single, shared pool.