In 11g R2 RAC, when a node is deleted, only the OCR and the inventory of the remaining nodes is updated. Grid  software from the deleted node is not removed and inventory of the deleted node is not updated
Hence, to add back a deleted node we need not copy the Grid software on the node which was deleted earlier. Only the following steps need to be executed:
Current scenario:
I have two nodes in the cluster presently.
Host names :
- host01.example.com 
- host02.example.com
Node which was deleted earlier and has to be added back:
-  host03.example.com
– Run addNode.sh from a currently existing  node (say host01) with no copy option
- login as grid
[grid@host01]$ cd /u01/app/oracle/11.2.0/grid/oui/bin
[grid@host01]$./addNode.sh -silent -noCopy ORACLE_HOME=/u01/app/11.2.0/grid “CLUSTER_NEW_NODES={host03}” “CLUSTER_NEW_VIRTUAL_HOSTNAMES={host03-vip}”
This step updates the inventories on the nodes and instatiates scripts on local node.
– Run root.sh on the newly added node
– If root.sh is not on the newly added node, copy it from any  of the existing nodes
– Chck that the node has been added
                         crsctl stat res -t

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