HP UX SNAplus2 manual 356

Using SNAplus2 in a High Availability Environment

What is High Availability?

Figure D-1	SNAplus2 client/server network
	Client	Client	Client

Client

LAN

Client/server network link

S800	SNAplus2 Link software
Server

Disk Drives

SNA network link

3xxx

Communications

Controller

IBM

Host

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

356 Appendix D