Using Load Balancing with the Connect String
You can use Siebel native load balancing across Siebel Servers with the following Siebel object interface: Siebel Java Data Bean
To use load balancing with the connect string
- Modify the predefined connect string so that it directs requests to an appropriate virtual host. - This host includes specific Siebel Servers. Each Siebel Server includes the required object manager. 
- Specify the path to the file that defines the virtual host. 
Connect String That Uses Load Balancing with Siebel Java Data Bean
A connect string that uses native Siebel load balancing with Siebel Java Data Bean uses the following format:
host="siebel://VirtualHost/EnterpriseServer/AppObjMgr_lang"
If you use Java code to connect to the Siebel Server, then Siebel CRM reads virtual host definitions from the following property in the siebel.properties file:
siebel.conmgr.virtualhosts
The siebel.properties file must reside in the classpath of the Java Virtual Machine.
For information about using virtual hosts in the siebel.properties file, see Transports and Interfaces: Siebel Enterprise Application Integration.