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Appendix D 363
Using SNAplus2 in a High Availability Environment
SNAplus2 High Availability Features
Figure D-4 SNAplus2 on Primary and Backup Servers
Whenever the primary server is about to become unavailable (during
preventative maintenance periods, for example), the SNA connectivity is
switched to the backup server through the following steps:
Step 1. The SNAplus2 Port HAPORT is started on the backup server using the
command snapadmin start_port, port_name=HAPORT.
Step 2. The SNAplus2 LS HALS is started on the backup server, if it is configured
to be operator started, using the command snapadmin start_ls,
ls_name=HALS.
Client Client Client Client
3xxx
Communications
Controller
IBM
Host
LAN
Primary HP-UX Server hp_pri
Production Configuration
Node.................HANODE
LS.....................HALS
Port...................HAPORT
LUs...................HALUO1...HALU09
Backup HP-UX Server hp_back
Development Configuration
Node................DEVNODE
LS....................DEVLS
Port..................DEVPORT
LUs..................DEVUO1...DEVLU09
Token Ring