Specifications

5102ch03.fm Draft Document for Review May 12, 2014 12:46 pm
86 IBM Power System S822 Technical Overview and Introduction
3.4.1 PowerVM editions
The two editions of PowerVM are suited for various purposes:
򐂰 PowerVM Standard Edition
This edition provides advanced virtualization functions and is intended for production
deployments and server consolidation.
򐂰 PowerVM Enterprise Edition
This edition is suitable for large server deployments such as multi-server deployments and
cloud infrastructures. It includes unique features such as Active Memory Sharing and Live
Partition Mobility.
Table 3-3 lists the feature codes of the PowerVM Editions that are available on the
Power S822 server.
Table 3-3 Available PowerVM editions
3.4.2 Logical partitions
Logical partitions (LPARs) and virtualization increase use of system resources and add a new
level of configuration possibilities.
Logical partitioning
Logical partitioning was introduced with the POWER4 processor-based product line and the
AIX Version 5.1, Red Hat Enterprise Linux 3.0 and SUSE Linux Enterprise Server 9.0
operating systems. This technology offered the capability to divide a 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 logical partitioning increased the flexibility, allowing selected system
resources, such as processors, memory, and I/O components, to be added and deleted from
logical partitions while they are executing. AIX Version 5.2, with all the necessary
enhancements to enable dynamic LPAR, was introduced in 2002. At the same time, Red Hat
Enterprise Linux 5 and SUSE Linux Enterprise 9.0 were also able to support dynamic logical
partitioning. 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.
Micro-Partitioning
The IBM Micro-Partitioning technology allows you to allocate fractions of processors to a
logical partition. This technology was introduced with POWER5 processor-based systems. A
logical partition using fractions of processors is also known as a
shared processor partition or
micropartition. Micropartitions run over a set of processors called a
shared processor pool,
and virtual processors are used to let the operating system manage the fractions of
processing power assigned to the logical partition. From an operating system perspective, a
virtual processor cannot be distinguished from a physical processor, unless the operating
system has been enhanced to be made aware of the difference. Physical processor are
abstracted into virtual processors that are available to partitions. The meaning of the term
physical processor in this section is a processor core.
Server PowerVM Standard Edition PowerVM Enterprise Edition
IBM Power S822 #5227 #5228