HP Integrity NonStop H-Series - Manual (Page 65)

3 Object Specifications
098571 Tandem Computers Incorporated 3–1
What Is in This Section This section gives detailed information on supplying object specifications within
DSNM commands. Object specifications are used to identify the objects against which
a DSNM command is being issued.
Objects in DSNM
Commands
All DSNM commands, except the AGGREGATE command, require that you specify at
least one object on which the command is to act. (The AGGREGATE command
retrieves information about objects in the aggregate; therefore, it does not require an
object specification.)
An object is any distinct, independently referable entity that management software can
perceive and control. DSNM extends the concept of objects to terminal control
processes and communications lines within subsystems.
DSNM command syntax requires that objects be identified via an object specification.
In the object specification, you can identify objects by subsystem object name or by
names defined in the Distributed Name Service (DNS) database. DNS is the Tandem
subsystem that manages a distributed object name database. For detailed information
on DNS and the concepts of DNS names, see the Distributed Name Service (DNS)
Management Operations Manual.
DSNM proceeds through two main stages in determining the actual set of objects on
which the command acts:
1. Name Resolution
During name resolution, DSNM resolves the names identified in the object
specification to subsystem objects.
2. Command Execution
During command execution, DSNM applies the modifiers included in the DSNM
command to the appropriate objects (as determined during name resolution), and
executes the command against the resulting objects. See Section 4, “Modifiers,” for
information on how modifiers are interpreted during command execution.
Object Specification An object specification consists of a list of one or more names together with a set of
optional qualifiers and an optional hierarchy modifier. The names in an object
specification can be any of the following:
A subsystem object name—directly specifies an individual subsystem object.
A DNS alias for a subsystem object name—specifies the individual subsystem
object to which it refers.
A DNS group—specifies the subsystem objects included by the group. A group
can contain objects, composites, or even other groups, which can contain objects,
composites, or more deeply nested groups.
A DNS composite—specifies all the subsystem objects that are members of the
composite.