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When you install SF Oracle RAC using the installsfrac program, to install and configure the entire cluster at one time, make sure that communication between systems exists. By default, the installer uses ssh for inter-system communication. You must grant permissions for the system where you run installsfrac program to issue ssh or remsh commands as root on all systems in the cluster.
If ssh is used for communication, you must configure it in a way such that it operates without requests for passwords or passphrases.
If remsh is used for communication, on each node, place a "+ +" character in the first line of the /.rhosts file to give 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 remsh access permissions after the installation and disk verification process.
Refer to the Veritas Storage Foundation and High Availability Solutions Getting Started Guide for more information on setting up ssh or remsh communication.