TS/MP System Management Manual (G06.24+, H06.03+)

Introduction to NonStop TS/MP System
Management
NonStop TS/MP System Management Manual—541819-001
1-13
Unsupported or Special-Function I/O Devices
The application interface to SNAX/HLS requires little detailed knowledge of SNAX or
SNA. For more information about the SNAX/HLS product, see the SNAX/HLS
Configuration and Control Manual .
Unsupported or Special-Function I/O Devices
Requests from unsupported or special-function I/O devices can be handled by the HP
Extended General Device Support (GDSX) product. GDSX is designed to help you
develop a front-end process that translates requests into a format supported by a
LINKMON process or (under Pathway/iTS) a TCP.
GDSX is a complex product. Before choosing to use GDSX, determine whether the
LINKMON process can manage the requests alone. If your environment includes
Pathway/iTS, investigate whether the PATHMON process and TCP can handle your
application requirements. If the specified data communications protocols are not
supported by existing Pathsend requesters or (under Pathway/iTS) a TCP, you might
decide to use a GDSX process as a front end to the application.
Using the GDSX product, you can implement message switching, develop and modify
data communications protocols, and perform data-stream conversions, all of which
facilitate access to server processes. For more information about the GDSX product,
see the Extended General Device Support (GDSX) Manual .
Pathsend Processes
Pathsend processes (also called Pathsend requesters) are user applications that
access server classes using Pathsend procedure calls. These procedure calls are part
of the Guardian procedure library. RSC and POET workstation clients are examples
of applications that communicate with server processes indirectly by means of
Pathsend requesters created by RSC on behalf of the clients. LINKMON processes
manage communicatons between Pathsend processes and server classes. System
management issues related to Pathsend are described in Section 6, Managing the
Pathsend Environment of this manual. (For information about how to write Pathsend
programs, see the TS/MP Pathsend and Server Programming Manual ).
Figure 1-6 on page 1-14 shows a PATHMON environment with Pathsend requesters.
Link management functions for Pathsend requesters are provided by the LINKMON
processes $ZL01 and $ZL02. A LINKMON process services requests only from
Pathsend processes executing in its processor.