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When you install VCS using the installvcs program, to install and configure the entire cluster at one time, make sure that communication between systems exists. By default the installer uses ssh. You must grant permissions for the system where you run installvcs program to issue ssh or remsh commands as root on all systems in the cluster. If ssh is used to communicate between systems, it must be configured in a way such that it operates without requests for passwords or passphrases. Similarly, remsh must be configured in such a way to not prompt for passwords.
If system communication is not possible between systems using ssh or remsh, you have recourse.
See Performing VCS installation in a secure environment.
See Manually installing and configuring VCS.