RSC/MP 7.2 Programming Manual

Introduction to Remote Server Call (RSC/MP)
HP NonStop Remote Server Call (RSC/MP) Programming Manual—522360-004
1-5
Host Components
Host Components
The host components are:
•
Transaction Delivery Process (TDP) — A persistent, NonStop process pair running
on the NonStop host (see Figure 1-1). The TDP is capable of handling
simultaneous access from multiple workstations. The TDP can send messages
directly to a Guardian named process, or it can send messages to a Pathsend
LINKMON process.
•
RSC/MP command interface (RSCCOM) — A command line interface to configure
and control the TDP.
•
RSC/MP Transport Pipe Manager (Pipeman) — Maintains the transport
connections. Pipeman can be run as a persistent NonStop process pair on the host
(see Figure 1-1). Pipeman can run on the same or a different CPU as the TDP.
One Pipeman process can communicate with one or more TDP processes.
Pipeman maintains the transport connections, freeing the RSC/MP layers for other
functions.
•
Network interfaces (NIF) — Manages the protocol-specific interface to the
communications facility. Each Pipeman process can have one or more NIF
processes.
•
Piccolo control program (PIPECP) — A command line interface used to control
Pipeman.
•
Access control server (ACS) — An optional user-written security control process
that, when called by the TDP, can accept or deny sessions and I/O requests from
workstations to application servers on the NonStop system.
The following subsections describe the software components of RSC/MP on the
NonStop host.
Transaction Delivery Process (TDP)
The TDP is a persistent process that resides on the NonStop system and does the
following:
•
Handles message routing for interprocess sessions.
•
Provides access to Pathway servers (via the LINKMON process or a user-written
IDS requester) and to Guardian processes.
•
Communicates with the RSCPIPE process on the workstation.
•
Handles many connections and workstations at one time and can also handle
multiple sessions from each workstation.
•
Controls and provides information about workstation connections.
Multiple TDPs increase performance, isolate workstation groups, or increase
persistence. Each TDP is independently started, configured, and managed.