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Appendix D 361
Using SNAplus2 in a High Availability Environment
SNAplus2 High Availability Features
Figure D-3 Applications using multiple servers
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:
Client
3xxx
Communications
Controller
S800
Server
IBM
Host
LAN
S800
Server