Upgrade 10.2 to 11.2 manualy using cold backup copy on new server.

Hi,
I am going to manually upgrade my databases to 11.2 from 10.2. I will use cold backup of 10.2 and copy in to the new server Red Hat Linux 5.
I got a Note (742108.1) done for upto 10.2.0.5 and it tells to set
orapwd file=$oracle_HOME/dbs/orapw<SID>
But my upgrade path is 10.2 to 11.2 and i would like to verify whether i need to do the same before startup in upgrade mode?? Nothing mention regarding this in Upgrade Guideline. Just telling only to copy password file to $oracle_HOME/dbs/
if so how i set it ? i mean in $ prompt or SQL Prompt?

I have 10 databases in one server and 2 seperate servers. I will do 3 changes mainly 32 bit to 64 bit, Suse Linux 9 to red Hat Linux 5 and 10.2.0.4 to 11.2.0.1
So best path to do all at once is cold backup and i verified it from oracle Support as well. because 32 bit o 64 bit conversion will automatically happend when upgrade.
My databses are nearly 300GB each and not much big . use for datawarehouse.

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