If the primary RAPCache (Adaptive Server Enterprise) fails, the application using it may not automatically failover to the secondary RAPCache. Other, manual means may be needed to redirect the failover.
The failure may not be with Adaptive Server itself; upstream components may have failed.
For this reason, do not rely on the normal Open Client (and ODBC or JDBC™) connection failover mechanisms that are available to Sybase client applications, unless the primary Adaptive Server shuts down. When a failure in the primary Adaptive Server is detected, redirect software that uses the primary Adaptive Server to fail over by manual means.