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DMTF Tutorial
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Schema > Common Models > Systems Model
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CIM Schema - Systems Model
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Overview | CIM Specification | CIM Schema | Extension Schema
Core Model
| Common Models
The CIM System Common Models defines computer-system related abstractions.
Many of the concepts related to computer system derive from the
CIM_System abstraction in the Core Model. CIM_System describes the
aggregation of 'parts' (or components) into a single manageable
'whole' (the system).
Important concepts related to a CIM_System are:
- Systems act as aggregation entities.
- Systems are not modeled as a collection. A system is more than
the sum of its parts. Systems have status and they host services
and access points.
- Systems are top-level objects that are frequently used to scope
their aggregated entities.
Besides the concept of the computer system itself, the System Model
also addresses compute components and functionality, associated
with most computer systems. These include concepts such as file
systems and files, operating systems, jobs, processes and threads,
and diagnostics. In addition, both general purpose and 'dedicated'
systems can be described. There are no specific subclasses to describe
system functionality (i.e. routing, storage, storage array, and
etc). The functionality of these systems is described by the services
that are hosted or are capable of being hosted. Otherwise, you end
up with individual subclasses routing, storage, etc. It is conceivable
that a single system could provide all of these. Therefore, the
dedicated property should be used to describe the primary functionalities
that the system supports.
Server Example:
When examining a typical server, we are likely to find the following
logical elements:
- Several installed operating systems, one running operating system
which has jobs and processes
- Local and remote file System that are composed of directories
and files.
- Logical devices such as a Monitor, Keyboard, Mouse, Hard Disk,
Processor, Power Supply, Fan, and etc.
- Services that are hosted on the server itself, such as spell
checker or a diagnostic service.
- Services that are available to the server via service access
points, such as a print service.
In addition, the server has physical aspects such as:
- The server is contained in chassis or multiple chassis which
may be mounted in a rack
- The server consists of cards and components (chips)
- The server occupies space at a known location
In the CIM environment the server is modularized into its elements.
These elements are then associated to the computer system.
- The elements denoted in blue are defined in the System Common Models.
- The high level concepts of the elements denoted in white are
defined in the Core Model.
- The specific subclasses of PhyscialElements (denoted in green)
are defined in the Physical Common Models.
- The specific subclasses of Logical Device (not shown) are defined
in the Device Common Models.
- The asset aspects of Software are defined as SoftwareIdentity
in the Core Model. While the deployment aspects of applications
are defined in the Application Common Models.
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