HP-UX SNAplus2 R7 General Information

SNAplus2 Networking Solutions
Adding a Second Server
As shown in Figure 3–2, Branch Linked by a Single SNAplus2 Server, a single SNAplus2 server can support
communication between the LAN at the branch office and the host at headquarters.
Figure 3–2 Branch Linked by a Single SNAplus2 Server
SNA Server
LAN
SNA Nodes
Host
FEP
SNA Clients
Controller
In this configuration, the host continues to run the bank’s central mission-critical applications, while the bank ex-
pands its network by using a single SNAplus2 server to support a number of clients over a LAN.
The SNAplus2 server is a high-performance product that can be scaled to meet the needs of the network as the
processing requirements increase. SNAplus2 is limited only by the resources available to the system (and its
licensing limits), because it uses scalable algorithms throughout.
The SNAplus2 server supports multiple HP-UX users, as well as user applications that run on the HP-UX and
Windows clients distributed around the LAN.
The SNAplus2 HP-UX and Windows clients communicate with the servers over a LAN using TCP/IP. Clients are
not SNA nodes; but they can run SNA applications using the server’s SNA node capability. Providing SNA support
through the SNAplus2 server means that the amount of code and processing on the client machines can be reduced,
because they are making use of the SNA node capability provided by the server. Each HP-UX client also supports
multiple users.
3.3 Adding a Second Server
The load on the SNAplus2 server increases as more clients are added to the network in the local branch of the bank.
The bank invests in a second SNAplus2 server that runs in parallel to the first, as shown in Figure 3–3, LAN with
Two SNAplus2 Servers. Adding a second server enables local load-balancing across the two servers; the second
server also provides a hot-backup capability.
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