HP UX SNAplus2 Figure D-1, SNAplus2 client/server network

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