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 Storage Device Path Persistence Using Oracle ASMLIB
  To use Oracle ASMLIB to configure Oracle ASM devices, complete the following tasks.
• Configuring Storage Device Path Persistence Manually
  You can maintain storage file path persistence by creating a rules file.
• Configuring Kernel Parameters for Linux
  These topics explain how to configure kernel parameters manually for Linux if you cannot complete them using the fixup scripts.