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network devices for other domains.
I/O domains
have direct access to physical
I/O devices and are typically used as service domains to provide access to these
devices. The control domain also is an I/O domain and can be used as a service
domain. Applications generally run in
guest domains,
which are non-I/O domains
using virtual devices provided by service domains. The domain structure and the
assignment of CPUs are shown in Figure 3.1.
Figure 3.1
Control and Guest Domains
The definition of a domain includes its name, amount of RAM and number
of CPUs, its I/O devices, and any optional hardware cryptographic accelerators.
Domain definitions are made by using the command-line interface in the control
domain, using the Oracle Enterprise Manager Ops Center product, or for the ini-
tial configuration, using the Logical Domains Configuration Assistant.
3.2.1.1 Domain Relationships
Each server has exactly one control domain, found on the instance of Solaris that
was first installed on the system. It runs Logical Domain Manager services, which
are accessed by a command-line interface provided by the
ldm
command. These
Logical Domain Manager services include a “constraint manager” that decides
how to assign physical resources to satisfy the specified requirements (the “con-
straints”) of each domain.
There can be as many I/O domains as there are physical PCI buses on the sys-
tem. An I/O domain is often used as a service domain to run virtual disk services
and virtual network switch services that provide guest domain virtual I/O devices.
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