80 IBM Eserver p5 590 and 595 System Handbooksingle server while reducing the number of physical adapters and devicesrequired in the system configuration.Figure 3-11 depicts the relationship between the physical adapters in the VIOSand the virtual I/O adapters in the client partitions. The figure shows the full suiteof POWER5 virtualization technologies, with additional detail regarding theVirtual I/O Server. In this drawing, the VIOS owns three physical I/O adapters;three client partitions own corresponding virtual I/O adapters. The thick solidlines running through the POWER Hypervisor represent the securecommunication channels between the virtual I/O device in the client partition andthe physical I/O device in the VIOS.Figure 3-11 IBM p5-590 and p5-595 Virtualization TechnologiesVirtual I/O Servers are the only partitions that can have virtual SCSI serveradapters assigned to them. Any partition can have virtual Ethernet adapters, anda VIOS is not necessarily required in order to use virtual Ethernet. However, theVIOS does provide a Shared Ethernet Adapter (SEA) service, which can bridgethe internal virtual network traffic though a physical Ethernet adapter and outonto an external physical network. Virtual SCSI and virtual Ethernet are brieflyexplained in 3.6, “Virtual SCSI” on page 81 and 3.3, “Virtual Ethernet” onpage 65. Shared Ethernet functionality is described in 3.4, “Shared EthernetAdapter” on page 73.POWER HypervisorProcessorResourcesMemoryResourcesI/OResourcesPlatform HardwareActivePoolCPUCPUCPUCPUCPUCPUCPUCPUCUoDCPU CPUCUoDMEMMEMMEMMEMServiceProcessorActiveIOA IOAIOA IOAIOA IOAIOA IOAVirtual I/O Server(VIOS) PartitionActivePoolVirtual Ethernet Virtual StorageVirtualTTYCPU CPUMEMMEMMEMMEMMEMMEMMEMMEMLinuxPartitionsi5/OSPartitionsAIX 5LPartitionsVirtualI/OAdapterVirtualI/OAdapterPhysicalI/OAdapterPhysicalI/OAdapterPhysicalI/OAdapterVirtualI/OAdapter
