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Appendix D 359
Using SNAplus2 in a High Availability Environment
SNAplus2 High Availability Features
Figure D-2 LU Pools
The LU pool gives you the ability to add a logical layer on top of the two
servers. Clients access the SNA network by referring to the LU pool
name, not to a specific LU in the pool. Within the SNAplus2
configuration above, the LU pool contains LUs associated with two LSs
— one for each S800 server. SNAplus2 automatically allocates an
available LU from the pool when you request it. In this way, high
availability is built into the network with redundant port s. If one port
fails, or if one of the servers fail, SNAplus2 will continue to function
through the other server.
Client/Server Configuration
SNAplus2 can be configured in either a standalone or client/server
configuration. The standalone configuration requires SNAplus2
applications to run on the same system that has the SNAplus2 Link
installed. The client/ server configuration provides an important benefit
Client Client Client Client
3xxx
Communications
Controller
S800
Server
IBM
Host
LAN
S800
Server
LU Pool A