TCP/IP (Parallel Library) Configuration and Management Manual

Configuring Parallel Library TCP/IP for Complex and
Heavy-Use Environments
HP NonStop TCP/IP (Parallel Library) Configuration and Management Manual—522271-006
3-8
Distributor Listening Model
The distributor listener model can benefit from the Parallel Library TCP/IP architecture
in two ways:
•
You can now run multiple distributor processes in multiple processors bound to the
same port with round-robin filtering enabled. This arrangement allows you to
spread the distributor’s work-load over as many processors as required achieving
unlimited scalability while presenting a single IP host to the outside world.
•
You shorten the path-length for data flow by eliminating the hop between the
distributor and the TCP/IP process, thereby improving performance.
Figure 3-4 on page 3-9 shows the distributor listener model in Parallel Library
TCP/IP. The distributor can now be duplicated across processors and only one hop
is required for outbound traffic because each processor housing the distributors
has direct access to the adapter. Figure 3-4 also shows the round-robin distribution
Figure 3-3. Distributor Listening Model in Conventional TCP/IP
VST0303.vsd
Server
Classes
A, D, G
Server
Classes
A, D, G
Processor 0
Server Classes
A, D, G
Processor 0
Processor 1
Processor 2
Server
Classes
A, D, G
Server
Classes
A, D, G
Processor 0
Server Classes
A, D, G
Processor 0
Processor 1
Processor 2
Server
Classes
A, D, G
Server
Classes
A, D, G
Processor 0
Server Classes
A, D, G
Processor 0
Processor 1
Processor 2
Distributor
TCP/IP
Hop 2
TCP/IP
Distributor
Distributor
TCP/IP
LAN Adapter LAN Adapter
LAN Adapter
Server Class Send
or Other IPC, Hop 1
Processor 3
Processor 4 Processor 5
Sockets
Three IP hosts