Envoy Application Programming Manual

Application Programming With Envoy
Envoy Application Programming Manual—427159-001
1-5
Control and Inquiry Interface
SCF is a DSM tool in the operations environment. It is a unified command interface that
simplifies the tasks of configuring, controlling, and collecting information about
Compaq subsystems.
When you use SCF, you can choose either to let a person perform an action (through a
terminal) or to automate that action through a command (OBEY) file. SCF returns
display and error-message output to a terminal or to a log file. Figure 1-3
shows these
communications.
The management services depend on the Subsystem Programmatic Interface (SPI) for
communication between the operations and subsystem environments. SPI is a standard
set of procedures and associated definition files that define common, message-based,
programmatic interfaces for communication between requesters and servers—for
instance, in a management application. SPI includes procedures to build and decode
specially formatted messages.
Control and Inquiry Interface
For management of the Envoy subsystem, the Subsystem Control Point (SCP) process is
required. This process provides control-and-inquiry management interfaces to a number
of Compaq data communications subsystems. Commands are sent to SCP, which
forwards them to the appropriate subsystems, or, in the case of a small number of
commands, handles them itself. SCP is used by the SCF interactive interface, as well as
by management applications you write.
Figure 1-4
illustrates the management interface to Envoy for commands and responses.
Figure 1-4. Management Interfaces to Envoy: Control and Inquiry
005CDT .CDD
Management
Application
Programmatic
Commands and Responses
SCF
TSM
SCP
Envoy
Envoy
Envoy
Interactive Commands and
Displayed Responses