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there would be lots of steps involved if you are trying to use rconfig. Specially when your source db is non-ASM. I would suggest you to build the 11g GRID and apply the neccessary patches to support the 10g RAC database on the 11g GRID cluster. ( one of them listed in MOS 1073926.1).
Also once the 10g Software is installed , you can use the RMAN to restore the database to ASM.
I hope that helps.
You must do the following:
First, restore the database into ASM. (see the previously mentioned link on how to do this)
Next UPGRADE the database to 11gR2
Then you use 11gR2 rconfig to RAC the database. You can only have one RAC version on the cluster. You can have multiple single-instance using other version (10g/11gR1) databases in an 11gR2 ASM environment.