AS/400 System Architecture: Underlying Strength of the AS/400e
22 AS/400e System Handbook
Logical partitions (LPAR) enable multiple independent OS/400 instances or partitions in an
n-way symmetric multiprocessing AS/400e 8xx, 7xx, 6xx, and Sxx. Each partition requires its
own processors, memory, disks, system console, and access to a CD-ROM or tape drive that
can be allocated to each partition. With LPAR, you can address multiple system requirements
in a single machine to achieve server consolidation, business unit consolidation, mixed
production, and test environments, integrated clusters, and more.
All V4R5 systems have a primary partition, with all resources initially allocated to it. Creating
and managing secondary partitions is performed from the primary partition. Movement of
processors, memory, and interactive performance between partitions is achieved with only an
IPL of the affected partitions. Movement of IOP resources is achieved without an IPL.
It is important to understand that a failure in the primary partition affects all of the logical
partitions that are created. For example, if the primary partition is powered down, all of the
secondary partitions are also powered down.
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 in V4R5.
OS/400 V4R5 must be installed on each partition for 8xx servers. Previous releases are not
supported on any logical partition on 8xx servers. Any combination of V4R5 and V4R4 is
supported on partitions for the 7xx, 6xx, and Sxx AS/400e systems and servers.
The following Web site is available for installation support and technical guidance. When
planning logical partitions for an AS/400e system, rely on this Web site for information,
direction, and management tips:
http://www.as400.ibm.com/lpar/
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