HP-UX SNAplus2 R7 Administration Guide

Appendix DUsing SNAplus2 in a High Availability Environment
Figure D–5 SNAplus2 on Primary and Backup Servers
Client Client Client Client
3xxx
Communications
Controller
IBM
Host
LAN
Primary HP-UX Server hp_pri
Temporarily Out of Service
Backup HP-UX Server hp_back
Development Configuration
Node................DEVNODE
LS....................DEVLS
Port..................DEVPORT
LUs..................DEVUO1...DEVLU09
Token Ring
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.
D.3 Using SNAplus2 with MC/ServiceGuard
MC/ServiceGuard (product number: B3935DA on 11i v1 and T1905BA on 11i v2) is a specialized facility for
protecting mission critical applications from hardware and software failures by allowing you to organize groups of
servers into clusters and applications (like SNAplus2) into packages. (See Managing MC/ServiceGuard, HP Part
No. B3936-90079). Using SNAplus2 in a ServiceGuard cluster protects against many of the unexpected failures
that can interrupt SNA network access to end users. The strategy employed by ServiceGuard is to prevent a single
failure from disrupting service by providing software and hardware redundancy. The typical SNAplus2 environment
might look like the following example when used with ServiceGuard.
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