As root I create DBA Group and Oracle User on both nodes, using the following commands:
useradd -g oinstall -G dba oracle
I got the latest rpm available for Linux platform on 64bit from EMC website for PowerPath solution and installed on both nodes as root.
I've setup WWN for this new Rac installation and created a logical storage group from EMC Navisphere software solution.
I've licensed properly this new hosts
Ok. Our nodes can connect and use the logical storage group.
Now it's time to format them (just from one node) as the following screenshot