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A processor pool is a set of physical processors that can be shared across different logical partitions. Shared Processor Pools have been available since the introduction of POWER5-based IBM Power Systems. POWER5-based servers support one shared processor pool which is identical with the physical shared processor pool.
POWER6-based and later servers support multiple shared-processor pools. The multiple shared-processor pools (MSPPs) is a capability that is supported on Power6 and later servers. This capability enables the creation of multiple processor pools to make allocation of the CPU resource more flexible. All Power Systems that support the multiple shared-processor pools capability have a minimum of one shared processor pool and up to a maximum of 64 shared processor pools. The default shared processor pool always has an ID of 0. The default behavior of the system, with only the default shared processor pool, is the current behavior of a POWER5 server with only a physical shared processor pool defined.
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