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If you configured ssh (SSH client) for the cluster nodes, the installation program can install SF Oracle RAC as long as ssh commands between nodes can execute without password prompting and confirmation.
If you did not configure ssh, enable each node to have remote rsh access to the other nodes during installation and disk verification.
On each node, placing a "+" character in the first line of the /.rhosts file gives remote access to the system running the install program. You can limit the remote access to specific nodes. Refer to the manual page for the /.rhosts file for more information.
Remove the remote rsh access permissions after the installation and disk verification process.