IBM Power 720 Overview page 146

Figure 3-9 shows the levels of unused capacity redistribution implemented by the POWER
Hypervisor.
Level
resolution
Level
0
capacity
SPP
resolution
resolution
Level capacity resolution
0
Resolution of the Entitled Pool Capacity
within the same Shared-Processor Pool
Figure 3-9 The levels of unused capacity redistribution
Capacity allocation above the entitled pool capacity (Level
The POWER Hypervisor initially manages the entitled pool capacity at the shared processor
pool level. This is where unused processor capacity within a shared processor pool is
harvested and then redistributed to uncapped micropartitions within the same shared
processor pool. This level of processor capacity management is sometimes referred to as
Level
capacity resolution.
0
At a higher level, the POWER Hypervisor harvests unused processor capacity from the
multiple shared processor pools that do not consume all of their entitled pool capacity. If a
particular shared processor pool is heavily loaded and several of the uncapped
micropartitions within it require additional processor capacity (above the entitled pool
capacity), then the POWER Hypervisor redistributes some of the extra capacity to the
uncapped micropartitions. This level of processor capacity management is sometimes
referred to as Level
132
IBM Power 720 and 740 Technical Overview and Introduction
capacity
1
SPP SPP
0
capacity SPP
0 1
resolution
p0 p1
Physical Shared Processor Pool
capacity resolution.
1
SPP
1
capacity SPP capacity
2
resolution
POWER Hypervisor
p2 p3
SPP
2 n
SPP capacity
n
resolution
p4 p5
Level capacity resolution
1
POWER Hypervisor harvests unused
processor capacity from Shared-Processor
Pools and redistributes it across all
uncapped micro-partitions regardless of the
Shared-Processor Pool structure
)
1