Specifications

134 IBM Power 770 and 780 Technical Overview and Introduction
Default Shared Processor Pool (SPP
0
)
On any Power Systems server supporting Multiple Shared Processor Pools, a default Shared
Processor Pool is always automatically defined. The default Shared Processor Pool has a
pool identifier of zero (SPP-ID = 0) and can also be referred to as SPP
0
. The default Shared
Processor Pool has the same attributes as a user-defined Shared Processor Pool except that
these attributes are not directly under the control of the system administrator. They have fixed
values (Table 3-4).
Table 3-4 Attribute values for the default Shared Processor Pool (SPP
0
)
Creating Multiple Shared Processor Pools
The default Shared Processor Pool (SPP
0
) is automatically activated by the system and is
always present.
All other Shared Processor Pools exist, but by default are inactive. By changing the maximum
pool capacity of a Shared Processor Pool to a value greater than zero, it becomes active and
can accept micro-partitions (either transferred from SPP
0
or newly created).
Levels of processor capacity resolution
The two levels of processor capacity resolution implemented by the POWER Hypervisor and
Multiple Shared Processor Pools are:
򐂰 Level
0
The first level, Level
0
, is the resolution of capacity within the same Shared Processor
Pool. Unused processor cycles from within a Shared Processor Pool are harvested and
then redistributed to any eligible micro-partition within the same Shared Processor Pool.
򐂰 Level
1
This is the second level of processor capacity resolution. When all Level
0
capacity has
been resolved within the Multiple Shared Processor Pools, the POWER Hypervisor
harvests unused processor cycles and redistributes them to eligible micro-partitions
regardless of the Multiple Shared Processor Pools structure.
SPP
0
attribute Value
Shared Processor Pool ID 0.
Maximum pool capacity The value is equal to the capacity in the physical Shared
Processor Pool.
Reserved pool capacity 0.
Entitled pool capacity Sum (total) of the entitled capacities of the micro-partitions in the
default Shared Processor Pool.