RSC/MP 7.3 Installation and Configuration Guide

Configuring the RSC/MP Transport (Piccolo)

HP NonStop Remote Server Call (RSC/MP) Installation and Configuration Guide—522358-011

5-3

Overview of Piccolo

Piccolo consists of a single manager process (Pipeman) and one or more network

interface processes (NIFSOCK, NIFNB, NIFASY, and so on). These processes running

together provide the communications mechanism that connects the RSC/MP

application running on the workstation to the TDP running on the NonStop host,

through RSCPIPE (which also runs on the workstation). A single instance of Piccolo

can support multiple TDP processes on the NonStop host or multiple instances of

RSCPIPE and RSC/MP applications on a workstation as shown in Figure 5-1:

Configuration information for the Piccolo components (Pipeman and the NIF programs)

is read from a single Piccolo configuration file which is required to exist and to be

readable by the Piccolo components at all times while the system is running. Along

with other information, the configuration file contains the unique name of the machine

on which Piccolo is running. This means that every Piccolo configuration file on the

host and workstation must be different.

Figure 5-1. The Piccolo Components

Note. Do not alter the Piccolo configuration file while Piccolo is running. On Windows and

NonStop platforms, the PIPEMAN process locks its configuration file for read access, and

holds that lock for as long as Piccolo continues running. On UNIX platforms, the file is not

locked by Piccolo; changing the file while Piccolo is running will result in unpredictable

behavior.

TDP

PIPEMAN

RSCPIPE

NIF NIF

RSC/MP

application

RSC/MP

application

Workst at ionNonStop Host

CDT003