YOGGIE YOGGIE MANAGEMENT SERVER Informations techniques télécharger pdf (Page 33)

Chapter 1. Introduction to LPAR on IBM System i5 15

It is possible for uncapped partitions to have their processing capacity exceed the current

processing capacity or more than 100% CPU utilization when they use the unused

processing units from the shared processors pool. This usually happens when the uncapped

partitions demand more processing power to complete their tasks. It is different in the case of

a partition with a capped processor. A capped partition will never exceed the assigned

processing capacity.

Although an uncapped logical partition can use more processor power than its assigned

processing capacity, the uncapped logical partition can never use more processing units than

its assigned number of virtual processors.

1.3.6 Shared capped processor

It is possible to configure a logical partition so that other logical partitions can use its unused

processing units, but the logical partition cannot use more processing units than its assigned

amount. Such a logical partition is known as a capped logical partition. The sharing modes in

the logical partition profile, as shown in Figure 1-10, determine if the logical partition is using

shared capped processors.

Figure 1-10 Capped processing sharing mode

Capped partitions cannot use idle processors in the shared processors pool when it demands

more processing power to complete their jobs. Additional processors must be allocated

manually using Dynamic Logical Partitioning (DLPAR) to a capped partition up to its

maximum virtual processor setting.

1.3.7 Virtual processor

A virtual processor is a representation of a physical processor to the operating system or

logical partition that uses the shared processors pool. A virtual processor is a method for

presenting fractional processors assigned to logical partitions as a whole number of

processors, because the operating system cannot calculate a whole number of processors

from fractional processors that are assigned to this logical partition. The Server firmware is

responsible for representing the processing units available for logical partitions into a whole

number of virtual processors.

Attention: When you try to add more processing units for an uncapped logical partition,

the number of desired physical processing units as the result of the addition must be equal

to or less than the desired number of virtual processors.

Attention: When you try to add more processing units for a capped logical partition, the

number of desired physical processing units as the result of the addition must be equal to

or less than the desired number of virtual processors.

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YOGGIE YOGGIE MANAGEMENT SERVER Informations techniques Page 33