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Chapter 1. Introduction to LPAR on IBM System i5 13

When a partition with dedicated processors is powered down, their processors will be

available to the shared processors pool. This capability is enabled from the partition profile

setting. Check the Allow idle processors to be shared option to enable this feature as

shown in Figure 1-8. If this feature is not selected, the dedicated processors from inactive

logical partitions will not be available in the shared processors pool. Idle processors from

active partitions with dedicated processors can be used by any uncapped partition that

requires additional processing units to complete its jobs.

Figure 1-8 Allow idle processors to be shared option in partition profile

If logical partition configuration allows the dedicated processors to be shared in the shared

processors pool, these dedicated processors are still committed to the logical partition that

these processors belong to. When the inactive logical partition is activated, it will regain its

dedicated processors from the shared processors pool.

You can add more processors for a logical partition using Dynamic Logical Partition functions.

However, this is limited by the maximum number of processors for this logical partition.

Changing the maximum processors for the current logical partition requires a logical partition

restart.

Dynamically moving processors in and out of a logical partition with dedicated processors

could result in processors in a partition being spread across nodes. There is no guarantee

that the best configuration can be maintained. The optimum allocation of processors and

memory is performed by the Power Hypervisor during the initial startup to standby or

operational mode when you start or power on the managed system. Any changes to the

configuration of partitions after this through Dynamic Logical Partitioning (DLPAR) could

disrupt the optimum allocation.

A full system restart is required to return the system to the optimal configuration. Set the

system configuration to the desired configuration before restarting.

1.3.4 Shared processor

The shared logical partition can use unassigned processors and processors that are

assigned to other logical partitions but are currently unused by that partition. The amount of

processing power that the logical partition can use is limited only by the virtual processor

settings of the logical partition and the amount of unused processing units available in the

shared processors pool.

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YOGGIE YOGGIE MANAGEMENT SERVER Informations techniques Page 31