This image show the overview of the process for a clustered server installation. The process is as follows:
Start the database, check for the PATH environment variable, and complete the M6.3.x cluster worksheet
Run the WLS Domain configuration wizard.
Start the WLS admin server.
Run the WLS domain configuration wizard on each clustered server machine.
Run the MSS Installer on each clustered server machine
Restart the WLS admin server
Start all clustered servers using a custom script
Deploy MS6.3.x to cluster
Configure the load balancer or proxy war file
Tune your servers (optional but recommended)