Enable the connection failover using the unixODBC command line tool.
If you are linking to the unixODBC Driver Manager, edit the Adaptive Server ODBC datasource template, odbc.ini, and reinstall the datasource using the unixODBC command line tool:
# odbcinst -i -s -f dsn_template_file
where dsn_template_file is the complete path to the Adaptive Server ODBC datasource template file.