iSeries architecture: Fundamental strength of the IBM ^ i5 and iSeries 29
Draft Document for Review October 18, 2004 5486AdvTech.fm
uses POWER Hypervisor, as described in “POWER Hypervisor” on page 13, to
deliver this virtualization support.
LPAR as implemented on iSeries extends the original architectural design
concept of application execution by allowing OS/400, Linux or AIX to run in a
given partition. Extensive dynamic and granular resource sharing is allowed
across processors (SMP configurations), memory, disk, tape, and other devices,
including Virtual Ethernets, which are covered in the next section. Multiple
partitions are supported for selected iSeries uni-processor models. Resource
sharing across partitions is illustrated in the following graphic.
With i5/OS partitions can be defined as capped or uncapped. Capped partitions
cannot exceed their assigned processor resouces. Uncapped partitions can
utilize automatically extra unused processing power in a shared pool. For a
detailed description refer to , “Capped and uncapped partitions” on page 52
You can find more details about LPAR in “Logical partitions” on page 541.
Virtual Ethernet
Virtual Ethernet (also referred to as Virtual LAN (VLAN)) provides the ability to
provide multiple communication paths between applications that are executed in
each logical partition. More importantly, Virtual Ethernet allows high-speed
bus-to bus communication between
selected OS/400 partitions and Linux
partitions. It is possible to tie in each of the multiple communication paths
between partitions to a specific application. OS/400 V5R2 introduced the
capability to connect Integrated xSeries Servers and Integrated xSeries Adapters
via Virtual Ethernet.
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