Database cold backup in oracle 10g

Hi,
oracle-10.2g
solaris-10
The oracle database i connected with the sun cluster 3.2(two node cluster), for taking the cold backup one of the resource(instance). When I shutdown the resource(instance) for taking the cold backup. The resource(instance) starts automatically again on the same node.
Kindly provide me the solution for taking the cold backup by shutting down the instance.
Regards
Dravidan

Here is the procedure for taking coldbackup:
First shutdown the database then copy all the datafiles, tempfiles, control files and logfiles to a safe place using the select command. Then run the script as described here: http://tinyurl.com/bp85dmj

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