HP-UX SNAplus2 R7 Administration Guide

Appendix DUsing SNAplus2 in a High Availability Environment
Figure D–13 Client/Server Configuration Using SDLC DLC
Client Client Client Client
3xxx
Communications
Controller
IBM
Host
LAN
Primary HP-UX Server hp_pri
PSI Adapter
Backup HP-UX Server hp_back
PSI Adapter
Card 0Card 0
Multi-drop
Modem
SNA connection over an IP-based network
SNAplus2 can be configured over an IP-based network using the Enterprise Extender feature. This can be further
configured for High Availability using ServiceGuard. The requirement for ServiceGuard is that you specify the
floating IP address associated with the SNAplus2 package and configure SNAplus2 to use the floating IP address
for connectivity.
The following failover scenarios are handled in the ServiceGuard setup:
LAN card failure
As shown in Figure D–14, ServiceGuard handling LAN card failure, ServiceGuard sets up the floating IP address
over Card 0 and starts the SNAplus2 package. In the event of Card 0 failure, ServiceGuard will migrate the floating
IP address to the standby Card 1, and the Host can remain connected to the SNA server using the floating IP address.
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