You can complete the preinstallation configuration tasks manually.

Oracle recommends that you use Oracle Universal Installer and Cluster Verification Utility fixup scripts to complete minimal configuration settings. If you cannot use fixup scripts, then complete minimum system settings manually.

• Configuring SSH Manually on All Cluster Nodes
  Passwordless SSH configuration is a mandatory installation requirement. SSH is used during installation to configure cluster member nodes, and SSH is used after installation by configuration assistants, Oracle Enterprise Manager, Opatch, and other features.
• Configuring Kernel Parameters on Oracle Solaris
  These topics explain how to configure kernel parameters manually for Oracle Solaris if you cannot complete them using the fixup scripts.
• Configuring Shell Limits for Oracle Solaris
  For each installation software owner user account, check the shell limits for installation.