How to find name of your cluster in RAC environment

To find out the value of your CLUSTER_NAME from CRS (OCR), do the following from the CRS_HOME:

$CRS_HOME/bin/cemutlo -n

==>> OR

cd $CRS_HOME/bin
./ocrdump

=> this will create a text file called OCRDUMPFILE
open that file and look for this entry
[SYSTEM.css.clustername]
ORATEXT : crs_cluster

In this case, "crs_cluster" is the cluster name.