Chapter 3. Virtualization 103Figure 3-6 Overview of the architecture of Multiple Shared-Processor PoolsMicro-partitions are created and then identified as members of either the defaultShared-Processor Pool 0 or a user-defined Shared-Processor Pool n . The virtual processorsthat exist within the set of micro-partitions are monitored by the POWER Hypervisor andprocessor capacity is managed according to user-defined attributes.If the Power Systems server is under heavy load, each micro-partition within aShared-Processor Pool is guaranteed its processor entitlement plus any capacity that it canbe allocated from the Reserved Pool Capacity if the micro-partition is uncapped.If certain micro-partitions in a Shared-Processor Pool do not use their capacity entitlement,the unused capacity is ceded and other uncapped micro-partitions within the sameShared-Processor Pool are allocated the additional capacity according to their uncappedweighting. In this way, the Entitled Pool Capacity of a Shared-Processor Pool is distributed tothe set of micro-partitions within that Shared-Processor Pool.All Power Systems servers that support the Multiple Shared-Processor Pools capability willhave a minimum of one (the default) Shared-Processor Pool and up to a maximum of 64Shared-Processor Pools.Default Shared-Processor Pool (SPP0)On any Power Systems server supporting Multiple Shared-Processor Pools, a defaultShared-Processor Pool is always automatically defined. The default Shared-Processor Poolhas a pool identifier of zero (SPP-ID = 0) and can also be referred to as SPP 0 . The defaultShared-Processor Pool has the same attributes as a user-defined Shared-Processor Poolexcept that these attributes are not directly under the control of the system administrator; theyhave fixed values (Table 3-5).POWER Hypervisorp1p0Physical Shared-Processor Poolp2 p3 p4 p5 p6 p7Shared Processor Pool0Set of micro-partitionsAIX V5.3EC 1.6AIX V6.1EC 0.8LinuxEC 0.5vp0vp1vp2 vp3vp4AIX V6.1EC 1.6AIX V6.1EC 0.8LinuxEC 0.5vp5vp6vp7vp8 vp9vp10Shared Processor Pool1Set of micro-partitionsUnused capacity in SPP0 isredistributed to uncappedmicro-partitions within SPP 0Unused capacity in SPP1 isredistributed to uncappedmicro-partitions within SPP 1KEY:EC Entitled Capacityp Physical processorvp Virtual processorSPPn Shared-Processor Pooln
