TCP/IP (Parallel Library) Configuration and Management Manual

Introduction
HP NonStop TCP/IP (Parallel Library) Configuration and Management Manual—522271-006
2-2
Single IP Host
request latency. In addition, more requests per second can be serviced using the same
processor cost, resulting in higher throughput.
Single IP Host
In conventional TCP/IP, if you ran multiple process instances of a listening application
in multiple processors (to increase computing power), you needed a different TCP/IP
process (one per listening application process instance) in each processor. Each
TCP/IP processes required a unique physical port (PIF) and presented a unique IP
host to the outside world.
Parallel Library TCP/IP allows multiple application process instances running in
different processors to be presented to the outside world as a single IP host, because
by using Parallel Library TCP/IP, you can run multiple process instances of a listening
application in multiple processors, all sharing the same PIF. ServerNet™ allows all
processors in a clustered system to access the same PIF; Parallel Library TCP/IP
allows applications in different processors to access the same PIF and share a
common listening TCP port number.
Figure 2-1 shows the multiple IP hosts in the conventional TCP/IP environment
discussed above, and Figure 2-2 on page 2-3 shows the single IP host possible in
Parallel Library TCP/IP.
Figure 2-1. Multiple IP Appearance, Conventional TCP/IP
VST0201.vsd
Web 1
Web 2
TCP/IP 1
TCP/IP 2 TCP/IP 16
Web 16
Message System
Inter-Process
Transfer
Processor 0 Processor 1 Processor 15
Message System
Inter-Process
Transfer
LAN Adapters LAN AdaptersLAN Adapters