What Happens when root.sh run in RAC installation?

Node 1
 Initial Setup 
 Setup OLR for storing Oracle local registry data
 Setup GPnP wallet and profile
 Setup and copy files for OHASD daemon (startup scripts rc.d etc)
 Start OHASD Daemon
 Copy required CRS resources for OHASD to start
 Start in Exclusive Mode and Configure Diskgroup
 Push GPnP Profile to Remote Node(s)
 Start Full Clusterware Stack
 Adding Clusterware Resources

Other Nodes
 Initial Setup  
 Get GPnP Profile
 Setup OLR for storing Oracle local registry data
 Setup and copy files for OHASD daemon (startup scripts rc.d etc)
 Start OHASD Daemon 
 Copy required CRS resources for OHASD to start
 Start Full Clusterware Stack
 Adding Clusterware Resources

Again from Suresh Gandhi..Thank you