Virtual I/O Server - IBM Power 720 Overview

deactivate a shared processor pool. A shared processor pool cannot be deactivated unless all
micropartitions hosted by the shared processor pool have been removed.
Live Partition Mobility and multiple shared processor pools
A micropartition can leave a shared processor pool because of PowerVM Live Partition
Mobility. Similarly, a micropartition can join a shared processor pool in the same way. When
performing PowerVM Live Partition Mobility, you are given the opportunity to designate a
destination shared processor pool on the target server to receive and host the migrating
micropartition.
Because several simultaneous micropartition migrations are supported by PowerVM Live
Partition Mobility, it is conceivable to migrate the entire shared processor pool from one server
to another.

3.4.4 Virtual I/O Server

The Virtual I/O Server is part of all PowerVM editions. It is a special-purpose partition that
allows the sharing of physical resources between logical partitions to allow more efficient
utilization (for example, consolidation). In this case, the Virtual I/O Server owns the physical
resources (SCSI, Fibre Channel, network adapters, and optical devices) and allows client
partitions to share access to them, thus minimizing the number of physical adapters in the
system. The Virtual I/O Server eliminates the requirement that every partition owns a
dedicated network adapter, disk adapter, and disk drive. The Virtual I/O Server supports
OpenSSH for secure remote logins. It also provides a firewall for limiting access by ports,
network services, and IP addresses. Figure 3-10 shows an overview of a Virtual I/O
Server configuration.
External Network
Physical
Disk
Physical
Disk
Figure 3-10 Architectural view of the Virtual I/O Server
Because the Virtual I/O Server is an operating system-based appliance server, redundancy
for physical devices attached to the Virtual I/O Server can be provided by using capabilities
such as Multipath I/O and IEEE 802.3ad Link Aggregation.
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IBM Power 720 and 740 Technical Overview and Introduction
Virtual I/O Server
Shared Ethernet
Adapter
Physical Ethernet Virtual Ethernet
Adapter Adapter
Physical Disk Virtual SCSI
Adapter Adapter
Hypervisor Virtual I/O Client 1
Virtual Ethernet
Adapter
Virtual SCSI
Adapter
Virtual I/O Client 2
Virtual Ethernet
Adapter
Virtual SCSI
Adapter