HP-UX SNAplus2 R7 General Information

SNAplus2 Networking Solutions
Adding APPN Capability
Figure 33 LAN with Two SNAplus2 Servers
Server
supports
multiple
users
SNA Server 2
UNIX client
supports
multiple users
LAN
Regional branch
SNA Server 1
Other branch
configurations
Host
FEP
UNIX and
Windows
Clients
on LAN
Controller
As the local network expands, the two servers enable the network to support increased trafc without duplicating
all the resources in the network. Also, the number of additional links required to the host is reduced, because all
of the clients share the links between the server and the host.
The local branch achieves scalable load balancing by dening LUs on both servers and assigning all of those LUs
to one LU pool. The applications on the clients are congured to use an LU from that pool. If no LUs are available
on one server, the client automatically uses an LU that is available on the second server.
As more clients are added to the ever-expanding network and the network trafc continues to increase, the bank
can add more SNAplus2 servers, all with LUs that are assigned to the existing LU pool. This conguration enables
client applications to start using these new LUs without any additional conguration. In this way, the processing
power within the network can be expanded as required, without the need for network downtime or the need to
recongure clients.
This conguration also provides hot backup capability in the network, by using multiple servers in the client/server
conguration. If a communication link fails between one of the servers and the host, the restarted application can
automatically use an LU from the pool; the LU can reside on any of the remaining connected servers.
3.4 Adding APPN Capability
As the local branch diversies into the nancial services sector, the bank wishes to integrate new peer-based
applications into its existing network while maintaining its existing investment in corporate host-based applications.
The nancial services division has its own APPN network that supports local applications, while also providing
connectivity to the host at headquarters, as shown in Figure 34, SNA Network Including APPN.
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