changed from /opt/hadoop-1.1.0 to /opt/hadoop-1.2.1
1) Using  hadoop-1.2.1 
2) hadoop-1.2.1.tar.gz is to be placed in /hadoop/files/ for then script to work
Using 3 slaves
Using  hadoop-1.2.1 instead of  hadoop-1.1.1
Hadoop installable to be stored in module instead for downloading from net
Using 2 slaves and 1 master