To create a redundant high availability, warm standby environment, you must configure two OpenSwitch servers. One OpenSwitch server is the primary, which typically connects application end users to the active Adaptive Server. The second OpenSwitch server is the secondary, which typically connects DSS users to the standby Adaptive Server to load-balance the servers. In this case, the secondary OpenSwitch is never used by application end users unless the primary OpenSwitch fails.
See “DSS users” for more information about a typical load-balancing environment.
To operate two OpenSwitch servers in your environment, you must also configure two RCM instances: The first RCM instance is the primary RCM, coordinating the connections for application end users; the second RCM instance is redundant, and is never used for failover processing unless the primary RCM fails.
In case of mutually-aware OpenSwitch setup, RCM's failover
processing depends on the OpenSwitch that detects and handles the
Adaptive Server failure. For example, if primary OpenSwitch
handles the Adaptive Server failure, then the primary RCM starts
the failover processing. If secondary OpenSwitch
handles the Adaptive Server failure, then the secondary RCM starts
the failover processing.
