Chapter 3. Virtualization
89
Figure 3-5 shows an overview of a VIOS configuration.
Figure 3-5 Architectural view of the VIOS
Because the VIOS is an operating system-based appliance server, redundancy for physical
devices attached to the VIOS can be provided by using capabilities such as Multipath I/O and
IEEE 802.3ad Link Aggregation.
Installation of the VIOS partition is performed from a special system backup DVD that is
provided to clients who order any PowerVM edition. This dedicated software is only for the
VIOS (and IVM in case it is used) and is only supported in special VIOS partitions. Three
major virtual devices are supported by the Virtual I/O Server:
Shared Ethernet Adapter
Virtual SCSI
Virtual Fibre Channel adapter
The Virtual Fibre Channel adapter is used with the NPIV feature, described in 3.3.7, “N_Port
ID Virtualization (NPIV)” on page 96.
Shared Ethernet Adapter
A Shared Ethernet Adapter (SEA) can be used to connect a physical Ethernet network to a
virtual Ethernet network. The SEA provides this access by connecting the internal Hypervisor
VLANs with the VLANs on the external switches. Because the SEA processes packets at
layer 2, the original MAC address and VLAN tags of the packet are visible to other systems on
the physical network. IEEE 802.1 VLAN tagging is supported.
The SEA also provides the ability for several client partitions to share a physical adapter.
Using an SEA, you can connect internal and external VLANs using a physical adapter. The
SEA service can only be hosted in the VIOS, not in a general purpose AIX or Linux partition,
and acts as a layer-2 network bridge to securely transport network traffic between virtual
Ethernet networks (internal) and one or more (EtherChannel) physical network adapters
(external). These virtual Ethernet network adapters are defined by the POWER Hypervisor on
the VIOS.
Shared Ethernet
Adapter
Virtual I/O Server
Virtual I/O Client 1
External
Network
Hypervisor
Virtual Ethernet
Adapter
Virtual SCSI
Adapter
Virtual SCSI
Adapter
Virtual Ethernet
Adapter
Physical
Disk
Physical
Disk
Physical
Ethernet Adapter
Physical Disk
Adapter
Virtual I/O Client 2
Virtual SCSI
Adapter
Virtual Ethernet
Adapter
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