Managing shared processor pools

A shared processor pool is a PowerVM® technology that you can use to control the amount of processor capacity that partitions can use from the available physical processors in the system.

Multiple shared processor pools is a capability that is supported on POWER6® technology, or later. This capability isolates work loads in a shared processor pool and prevents the work load from exceeding an upper limit. This capability is also useful for software license management, where subcapacity licensing is involved.

Up to 64 shared processor pools can be defined on IBM® Power Systems™ servers that support multiple shared processor pools. A default shared processor pool is automatically defined in the managed system.

Each shared processor pool has a maximum processing units value that is associated with it. The maximum processing units define the upper boundary of the processor capacity that can be used by the set of partitions in the shared processor pool.

The system administrator can optionally allocate a number of reserved processing units to a shared processor pool. The reserved processing units represent the available processor capacity with the processor capacity entitlements of the individual partitions in the shared processor pool. The default value for the reserved processing units is zero.

By using the Hardware Management Console (HMC), you can complete the following tasks:
  • Allocate a specific amount of the processing capacity from the shared processor pool to each partition that uses the shared processors.
  • Configure the shared processor pools with a maximum processing unit value and a reserved processing unit value.
  • View information about your shared processor pool and change the properties of that pool.
Note: The default shared processor pool is pre-configured. Hence, you cannot change the properties of the default shared processor pool. The maximum number of processors available to the default shared processor pool is the total number of active, licensed processors on the managed system minus the number of processors that are assigned to dedicated processor partitions that are set to not to share their dedicated processors.

Last updated: Tue, June 12, 2018