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This is a good place to start because it allows all partitions to be able to utilize the CPUs in the shared processor pool. Configuring the virtual processor count to be the entire shared processor pool reduces the risk of an LPAR using these resources and being unable to use idle resources. Later, if you find an LPAR that should not have access to the shared processor pool, you can change the LPAR profile to have a smaller number of virtual processors. The other reason for choosing a smaller number of virtual processors is for software that is licensed by processor (core).
The HMC maintains a unified event log for all its managed systems that can be used for diagnostic and alerting purposes. 1, “Using the HMC for System p virtualization” on page 57. Integrated Virtualization Manager The Integrated Virtualization Manager (IVM) is a hardware management solution that inherits the most basic features of the HMC and removes the requirement of an external HMC. The IVM is limited to managing a single System p server. 2, “Using the IVM for System p virtualization” on page 58.
8 Considerations at the operating system and application level Due to the characteristics of the virtualization features in the System p POWER5 servers, the operating system and the application do not realize that they are running in either a micro-partitioned or a virtualized I/O environment. This capability allows all applications to run unmodified in a partition that takes advantage of both features. Additionally, because the VIOS partition handles the translation of the virtual adapters I/O operation to the physical adapter, you must ensure that this partition 24 Virtualizing an Infrastructure with System p and Linux is sized properly to handle the I/O requirements in all partitions based on I/O requirements.
Virtualizing an Infrastructure With System P and Linux by IBM Redbooks