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356 Appendix D
Using SNAplus2 in a High Availability Environment
What is High Availability?
Figure D-1 SNAplus2 client/server network
In this environment, applications run on client systems (HP9000s or
PCs) and access the IBM mainframe through an HP9000 S800 server.
The application might be SNAplus2 3270 or a custom application like an
APPC transaction program. Many software and hardware components
deliver SNA network connectivity to the end user in this picture. Since
the HP 9000 server plays such a critical role in maintaining the network
connectivity for multiple end users, it is important to minimize the
impact of component failures in and around the server.
For example , consider the following component failures:
• The LAN between the client and the server systems
• The LAN adapter card on the server system
Client Client Client
3xxx
Communications
Controller
S800
Server
IBM
Host
LAN
Client/server network link
SNAplus2 Link software
SNA network link
Disk Drives
Client