RSC/MP Installation and Configuration Guide

Best Practices Guide Scenario 2
Figure E-5. Scenario 2 modified to run without round-robin DNS
workstation
(group “B”)
workstation
(group “A”)
NonStop host
HOST1
Application Application
S er v er s
Servers
S er v er s
RSCPIPE RSCPIPE
TDP TDP TDP
active backup
PIPEMAN PIPEMAN
PIPEMAN
NIF NIF NIF NIF NIF NIF
TCP/IP TCP/IP $ZTC0 $ZTC1 $ZTC2 $ZTC3
10.1.90.20 10.1.90.21 10.1.90.22 10.1.90.23
Network
Group B workstations have
[RESOLVER]
HOST1=ip:10.1.90.21,ip:10.1.90.22
Group A workstations have
[RESOLVER]
HOST1=ip:10.1.90.20,ip:10.1.90.21
CDT016
Advantages
This configuration provides better throug hput than does the configuration in
scenario 1: The DNS system distributes connections among the participating
NIFs, and the PIPEMAN process distributes the connections among the
participating TDPs in a round-robin fashion.
This configuration can tolerate the loss of a CPU or network adapter on the
host.
Disadvantages
This configuration is more complex tha n the configuration in scenario 1.
The PIPEMAN process can become a bottleneck when many workstations are
connected through it and are making many RSC/MP requests. The practical
saturation point of the PIPEMAN process can be as low as two or three TDPs
and two or three NIFs, depending on the load.
HP NonStop Remote Server Call (RSC/MP) Installation and Configuration G uide — 52235 8- 013
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