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The article describes a data model that is used by the Configuration Development Facility (CDF). The CDF data model defines a data structure for, in this case, the definition of hardware device information.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
54% of the total text.
Page 1 of 1
Configuration Management Using an Entity-Relationship Data Model
The article describes a data model that is used by the Configuration
Development Facility (CDF). The CDF data model defines a data structure for, in
this case, the definition of hardware device information.
In CDF, data is structured on the basis of the well-known
entity-relationship (E/R) concept. The concept utilizes named
entities. Entities can be physical and real or conceptual and
abstract. Entities are classified according to type and described by
means of attributes and attribute values. In this case, the entity
types represent various classes of hardware devices, e.g., terminals,
card readers, printers and processors. Entities can be related to
one another and the relationship itself can be described by
attributes. In this case, a relationship is established between
hardware devices, i.e., device connectivity. The device-to-device
relationship permits the specification of the following:
1. the two hardware devices involved in the
2. the two physical interfaces involved in the
3. the cables involved in the connection, and
4. the flow of control between the devices.
As a result of this E/R data structure, no multiple connection records for the
purpose of defining multiple logical paths to a hardware device are required.
Another relationship is established between device address information (not
device numbers) and specific (device) interfaces. In this case, only the part of the
address that the in...