Operating System/400 (5722-SS1)
474 iSeries Handbook
Logical partitions are ideal for companies that want to run mixed interactive and server
workloads in a single iSeries. Logical partitions allow the interactive performance of an
iSeries to be flexibly allocated between partitions. OS/400 is licensed once for the entire
system by its normal processor group, regardless of the number of partitions. License
management across partitions is supported.
Set each partition's system values independently. Partitions have different system names and
may have a different primary/secondary national language, or be operated using different
time zones. This flexibility is ideal for banks and other multinational companies to centralize
operations in a single location yet retain the national characteristics of each system.
LPAR allows for the simultaneous running of multiple independent servers — each with its
own or shared (V5R1) processors, memory, and disk — within a single iSeries. Some
functions of LPAR are:
• Updates to Software Licensed Management (SLM) APIs allows customers and
business partners to monitor usage counts across the system rather than each
partition.
• An maximum number of partitions of 24 with V4R5 on the 8xx server models.
• Improvements in power management to minimize abnormal IPLs of secondary
partitions when the primary partition initiates a system power down.
LPAR – New with V5R1
LPAR in V5R1is significantly enhanced to allow dynamic movement of processor, memory,
and interactive performance between partitions. Up to four OS/400 V5R1 partitions per
processor with a maximum of 32 partitions is supported.
New capabilities applying to Models 8xx, 7xx, 6xx, and Sx0 include:
• Dynamic movement of processor, memory, and interactive performance between
partitions running OS/400 V5R1
Interconnected for application enhancement
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