HP UX SNAplus2 manual Appendix D 361

Using SNAplus2 in a High Availability Environment

SNAplus2 High Availability Features

Figure D-3 Applications using multiple servers

Client

LAN

S800 Server

S800 Server

3xxx

Communications

Controller

IBM

Host

The second way an application can use multiple servers is to have one SNAplus2 configuration that is used by multiple HP 9000 systems. For example, suppose two server systems are connected to an SNA network through Token Ring ports . The SNAplus2 configuration contains information about the definition of SNAplus2 nodes, ports , and LSs . Since it is a client/server configuration, it does not contain information about which server will activate those components. Let’s suppose one system is designated a primary server and another is designated a backup server. Most often the primary server is used in production to provide SNA connectivity for mission critical SNA applications that run on client systems. The backup server provides non- critical connectivity to the SNA network for development purposes. When the primary system is not available, the same node, ports , and LSs are activated on the backup system without any SNAplus2 configuration changes.

For example, suppose the following names are used for the SNAplus2 configuration:

Appendix D 361