IBM System p5 550 Technical Overview And Introduction page 73

Service Agent (see 3.2.3, "Service Agent" on page 85) for reporting HW errors to IBM is
not available on IVM.
IVM cannot be used by HACMP software to activate CoD resources on machines that
support CoD.
Despite those considerations, IVM provides advanced virtualization functionality without the
need for an extra-cost workstation. For more information about IVM functionality and best
practices, see Virtual I/O Server Integrated Virtualization Manager, REDP-4061, found at:
http://www.ibm.com/systems/p/hardware/meetp5/ivm.pdf
Figure 2-15 shows how a system with IVM is organized. There is a Virtual I/O server and IVM
installed in one partition owning all physical server resources and four client partitions. IVM
communicates to Hypervisor to
The dispatch of partitions on physical processors is done by the POWER Hypervisor, as in
HMC managed servers. The rules for mapping the physical processors, virtual processors
and logical processors apply, as discussed in 2.12.2, "Logical, virtual, and physical processor
mapping" on page 52, for shared partitions managed by the HMC.
Figure 2-15 IVM principles
Note: IVM and HMC are two separate management systems and cannot be used at the
same time. IVM targets ease of use, while HMC targets flexibility and scalability. The
internal design is so different that you should never connect an HMC to a working IVM
system. If you want to migrate an environment from IVM to HMC, you have to rebuild the
configuration setup manually.
create manage provide virtual I/O
, , and
Chapter 2. Architecture and technical overview
for client partitions.
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