RSC/MP Installation and Configuration Guide

Best Practices Guide Scenario 1
Disadvantages
This configuration does nothing to provide fault tolerance. If the host TDP or
PIPEMAN process should crash, no workstation will be usable. Loss of the
host NIF process can be tolerated, since PIPEMAN will restart the NIF
automatically; but if the CPU on which the NIF is running goes down, if the
network adapter fails, or if the network segment goes down, the system cannot
be used.
The host PIPEMAN and TDP processes will become bottlenecks and limit
system throughput when many workstations attempt to use RSC/MP
concurrently.
Possible improvements to this configuration
To improve availability, consider using the active backup capability of the host
TDP and PIPEMAN processes. Active backup allows persistent operation in
the face of a CPU outage or an RSC/MP crash on the host. For example, if the
CPU on which the PIPEMAN process is running should go down, the
PIPEMAN backup process would take over on a different CPU and restart the
NIF process. The TDP would then establish contact with PIPEMAN and
become ready to handle new connection requests (each workstation must
reconnect).
To improve throughput, consider runni ng additional instances of the entire
RSC/MP host process set (TDP plus PIPEMAN plus NIF). When doing so, use
PARAM PIPEINI to direct each TDP to its intended instance of PIPEMAN.
The host NIFs can be configured to run on the same network adapter or on
different network adapters. In either case, each workstation must be configured
to reach the specific, intended NIF processes:
Multiple NIFs on the same network adapter (see Figure E-2). The host
NIFs must listen on different service ports. In this case yo u need not give
each host PIPEMAN a unique SystemName, as long as yo u configure
each workstation to use only the one desired service port when connecting
to the host. The example shown in the diagram includes two groups of
workstations, ―A‖ and ―B‖, which both connect to HOST1 using different
service ports. Within the workstation Piccolo configuration, port 5001 or
port 5002 would be configured in the [NIF-name] section or within the
[RESOLVER] section.
HP NonStop Remote Server Call (RSC/MP) Installation and Configuration G uide — 52235 8- 013
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