Understanding the Software Configurations
For example, assume that you have 44 cores parked in the CPU repository and 704 GB of
memory parked in the memory repository. You could therefore create I/O Domains in any of the
following ways:
■
One or more large I/O Domains, with each large I/O Domain using one socket's worth of
resources (for example, 16 cores and 256 GB of memory)
■
One or more medium I/O Domains, with each medium I/O Domain using four cores and 64
GB of memory
■
One or more small I/O Domains, with each small I/O Domain using one core and 16 GB of
memory
When you go through the process of creating I/O Domains, at some point, the I/O Domain
Creation tool will inform you that you cannot create additional I/O Domains. This could be due
to several factors, such as reaching the limit of total CPU core and memory resources in the
CPU and memory repositories, reaching the limit of resources available specifically to you as a
user, or reaching the limit on the number of I/O Domains allowable for this system.
Note - The following examples describe how resources might be divided up between
domains using percentages to make the conceptual information easier to understand.
However, you actually divide CPU core and memory resources between domains at a socket
granularity or core granularity level. See “Configuring CPU and Memory Resources (osc-
setcoremem)” on page 170 for more information.
As an example configuration showing how you might assign CPU and memory resources to
each domain, assume that you have a domain configuration where one of the domains is a Root
Domain, and the other three domains are dedicated domains, as shown in the following figure.
Understanding the System 55
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