SAP on sun cluster 3.2 to 4.0

Dear All,

We would like to do the sun cluster upgrade from 3.2 to 4.0 for SAP system, what is the process? I can see lot of changes in sun cluster 4.0 , does SAP requires reinstallation?

Any help would be appreciated.

Read Note: 1740958 and http://www.oracle.com/us/solutions/sap/infrastructure/sap-resources-352184.html

Reg, Venkat