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Appendix A. Troubleshooting

The following sections cover various troubleshooting information that might be helpful when diagnosing issues during different stages of the installation process.

A.1. Troubleshooting during the installation

The troubleshooting information in the following sections might be helpful when diagnosing issues during the installation process. The following sections are for all supported architectures. However, if an issue is for a particular architecture, it is specified at the start of the section.

A.1.1. Disks are not detected

If the installation program cannot find a writable storage device to install to, it returns the following error message in the Installation Destination window: No disks detected. Please shut down the computer, connect at least one disk, and restart to complete installation.

Check the following items:

  • Your system has at least one storage device attached.
  • If your system uses a hardware RAID controller; verify that the controller is properly configured and working as expected. See your controller’s documentation for instructions.
  • If you are installing into one or more iSCSI devices and there is no local storage present on the system, verify that all required LUNs are presented to the appropriate Host Bus Adapter (HBA).

If the error message is still displayed after rebooting the system and starting the installation process, the installation program failed to detect the storage. In many cases the error message is a result of attempting to install on an iSCSI device that is not recognized by the installation program.

In this scenario, you must perform a driver update before starting the installation. Check your hardware vendor’s website to determine if a driver update is available. For more general information on driver updates, see the Updating drivers during installation section of the Performing an advanced RHEL installation document.

You can also consult the Red Hat Hardware Compatibility List, available at

A.1.2. Reporting error messages to Red Hat Customer Support

If the graphical installation encounters an error, it displays the unknown error dialog box. You can send information about the error to Red Hat Customer Support. To send a report, you must enter your Customer Portal credentials. If you do not have a Customer Portal account, you can register at Automated error reporting requires a network connection.


The graphical installation program encountered an error and displayed the unknown error dialog box.


  1. From the unknown error dialog box, click Report Bug to report the problem, or Quit to exit the installation.

    1. Optionally, click More Info…​ to display a detailed output that might help determine the cause of the error. If you are familiar with debugging, click Debug. This displays the virtual terminal tty1, where you can request additional information. To return to the graphical interface from tty1, use the continue command.
  2. Click Report a bug to Red Hat Customer Support.
  3. The Red Hat Customer Support - Reporting Configuration dialog box is displayed. From the Basic tab, enter your Customer Portal user name and password. If your network settings require you to use an HTTP or HTTPS proxy, you can configure it by selecting the Advanced tab and entering the address of the proxy server.
  4. Complete all fields and click OK.
  5. A text box is displayed. Explain each step that was taken before the unknown error dialog box was displayed.
  6. Select an option from the How reproducible is this problem drop-down menu and provide additional information in the text box.
  7. Click Forward.
  8. Verify that all the information you provided is in the Comment tab. The other tabs include information such as your system’s host name and other details about your installation environment. You can remove any of the information that you do not want to send to Red Hat, but be aware that providing less detail might affect the investigation of the issue.
  9. Click Forward when you have finished reviewing all tabs.
  10. A dialog box displays all the files that will be sent to Red Hat. Clear the check boxes beside the files that you do not want to send to Red Hat. To add a file, click Attach a file.
  11. Select the check box I have reviewed the data and agree with submitting it.
  12. Click Forward to send the report and attachments to Red Hat.
  13. Click Show log to view the details of the reporting process or click Close to return to the unknown error dialog box.
  14. Click Quit to exit the installation.

A.1.3. Partitioning issues for IBM Power Systems


This issue is for IBM Power Systems.

If you manually created partitions, but cannot move forward in the installation process, you might not have created all the partitions that are necessary for the installation to proceed. At a minimum, you must have the following partitions:

  • / (root) partition
  • PReP boot partition
  • /boot partition (only if the root partition is an LVM logical volume)

See Section E.4, “Recommended partitioning scheme” for more information.