IBM 520Q ユーザーズマニュアル

IBM System p5 520 and 520Q Technical Overview and Introduction

Dynamic logical partitions (LPARs) and virtualization increase utilization of system resources 
and add a new level of configuration possibilities. This section provides details and 
configuration specifications about this topic. The virtualization discussion includes 
virtualization enabling technologies that are standard on the system, such as the POWER 
Hypervisor™, and optional ones, such as the Advanced POWER Virtualization feature.

Logical partitioning (LPAR) was introduced with the POWER4 processor-based product line 
and the AIX 5L Version 5.1 operating system. This technology offered the capability to divide 
a pSeries system into separate logical systems, allowing each LPAR to run an operating 
environment on dedicated attached devices, such as processors, memory, and I/O 
components. 

Later, dynamic LPAR increased the flexibility, allowing selected system resources, such as 
processors, memory, and I/O components, to be added and deleted from dedicated partitions 
while they are executing. AIX 5L Version 5.2, with all the necessary enhancements to enable 
dynamic LPAR, was introduced in 2002. The ability to reconfigure dynamic LPARs 
encourages system administrators to dynamically redefine all available system resources to 
reach the optimum capacity for each defined dynamic LPAR.

Table 2-12 lists AIX 5L and Linux support for dynamic LPAR capabilities.

With the introduction of the POWER5 processor, partitioning technology moved from a 
dedicated resource allocation model to a virtualized shared resource model. This section 
briefly discusses the key components of virtualization on IBM System p servers. 

For more information about virtualization, see the following Web site:

You can also consult the following IBM Redbooks: 

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Advanced POWER Virtualization on IBM System p5, SG24-7940

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Sserver

Performance Considerations, SG24-5768

Processor

Y

Y

Y

N

Y

Memory

Y

Y

N

N

N

I/O slot

Y

Y

Y

N

Y