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Appendix D 373
Using SNAplus2 in a High Availability Environment
Using SNAplus2 with MC/ServiceGuard
To protect against a failure of a server’s LAN adapter, you can configure
a standby LAN adapter for the server. You can configure ServiceGuard to
assign the primary LAN adapter’s IP address to the standby LAN
adapter in the event of a failure. This way, TCP/IP connections from the
client system to the server system would be maintained during the
switch.
SNA LAN Connections
Another way SNAplus2 uses LANs is when the SNAplus2 server is
connected to the remote SNA system via a LAN.
Figure D-8 SNAplus2 Server connected to remote system via LAN
For this type of communication, SNAplus2 communicates with the LAN
driver using a Streams DLPI interface. Since ServiceGuard only
supports local LAN failover for IP network traffic, SNAplus2 will not be
able to take advantage of local LAN failover or floating IP addresses in
this case. If an SNA LAN adapter fails, SNA sessions will be
disconnected and the normal package failure recovery will take place.
3xxx
Communications
Controller
IBM
Host
HP 9000
Server
Token
Ring LAN