Ssh connectivity(password less) for oracle unix account in 11gR2 RAC

DB : 11.2.0.2
OS : Unix
While installiation of RAC, password less connectivity setup is required between two nodes to copying files and to run commands. This is mandatory before installation.
But after installation, is it require to have password less connectivity ( SSH) between two nodes ? By locking "oracle" unix account breaks ssh connectivity between two nodes. Even though it's not breaking cluster, but do we really need ssh connectivity once RAC db is up and running ?

it is also used when you apply patches but not for everyday 'normal' operation
http://download.oracle.com/docs/cd/B19306_01/install.102/b14203/prelinux.htm#BABJBAEB
Oracle Universal Installer uses the ssh and scp commands during installation to run remote commands on and copy files to the other cluster nodes. You must configure SSH so that these commands do not prompt for a password.
Source:-SSH for 10g RAC

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Ssh connectivity(password less) for oracle unix account in 11gR2 RAC

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