TCP/IP (Parallel Library) Configuration and Management Manual

Introduction
HP NonStop TCP/IP (Parallel Library) Configuration and Management Manual—522271-006
2-3
Single IP Host
Figure 2-1 on page 2-2 shows multiple instances of a Web application scaled to handle
heavy traffic by running in all 16 processors. This configuration requires a different IP
host for each of those Web applications.
Figure 2-2 also shows multiple instances of a Web application scaled to handle heavy
traffic by running in all 16 processors. However, in the Parallel Library TCP/IP
environment shown in Figure 2-2, only one IP host is required for all those application
instances.
Figure 2-1
on page 2-2 also shows the message system inter-process transfer that
occurs for data transfer in conventional TCP/IP. Figure 2-2
shows that the data transfer
in the Parallel Library TCP/IP environment happens within the library, a much faster
way to transfer data. The differences between the data flows in the two environments is
explained in more detail in Architectural Overview on page 2-9.
Remote clients trying to connect to the Parallel Library TCP/IP network only need to
know a single IP address to receive the processing power of up to 16 processors within
the system.
For multiple processors to share a physical port, a new, Parallel Library TCP/IP feature
called round-robin filtering must be enabled. Round-robin filtering allows an adapter to
distribute incoming requests among different listening processes. (See Round-Robin
Filtering on page 2-4.) For example, a Web server residing in each processor could be
configured to receive inbound requests in a round-robin manner. To use the round-
Figure 2-2. Single IP Appearance, Parallel Library TCP/IP
VST0202.vsd
ServerNet
LAN
Adapter
1.2.3.4
Processor 15
TCP/IP
Library
LAN Driver DIH
Web 16MON16
Processor 1
TCP/IP
Library
LAN Driver DIH
Web 2
MON 2
Processor 0
LAN Driver DIH
Web 1MON 1
TCP/IP
Library
TCP/IP library is loaded
into the application
process space so no
outbound message-
system inter-process
hop is needed for data
transfer.