HP -UX SNAplus2 Administration Manual page 364

Figure D-5
Using SNAplus2 in a High Availability Environment
SNAplus2 High Availability Features
At this point, the backup server has completely taken over the primary
server and is providing the HALU01...HALU09 LUs for the production
applications. The less important development LUs are no longer
available. The key point is that the production applications do not need
to change when this switch takes place. The location of where the
software components are started changes, not the underlying SNAplus2
configuration. SNAplus2 will automatically route data to and from the
production applications through the backup server.
SNAplus2 on Primary and Backup Servers
Client
Primary HP-UX Server hp_pri
Temporarily Out of Service
This feature makes it easy to provide backup capability when the
primary server needs to be taken offline. Later sections describe how the
MC/ ServiceGuard product can automate the switch from a primary to a
backup server even when unexpected failures occur.
364
Client Client
Backup HP-UX Server hp_back
Development Configuration
Node................DEVNODE
LS....................DEVLS
Port..................DEVPORT
LUs..................DEVUO1...DEVLU09
Token Ring
3xxx
Communications
Controller
IBM
Host
Client
LAN
Appendix D