How to fix the "Timed out waiting for device /dev/mapper/cs-home" error

Our Neighbors CentOS
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Fixing LVM Issues on CentOS After BIOS Updates

Problem Overview

After installing BIOS updates, CentOS failed to boot. The system was stuck at the booting stage, and older kernel versions also encountered the same issue. Even the rescue kernel image failed to boot.

Issue Diagnosis

  1. Enter GRUB Edit Mode

    • Press e during boot to access GRUB edit mode.

  2. Update GRUB Parameters

    • Modify the kernel parameters by removing rhgb quiet from the line that starts with linux (this enables printing detailed boot logs).
    • Save the changes and reboot using CTRL + x.

  3. Observe Boot Logs

    • Look for messages similar to the following:
      [TIME] Timed out waiting for device /dev/mapper/cs-home.
[DEPEND] Dependency failed for /home.
[DEPEND] Dependency failed for Local File System.

  4. Create a CentOS Image

    • Boot from a CentOS installation image on a USB drive and access the troubleshooting menu.

  5. Enable and Unlock the Root User

    • Run the following commands:
      sudo passwd root
sudo passwd -u root
    • Reboot into the failing kernels; this should now allow access to maintenance mode.

  6. Check Journal Logs

    • Use journalctl -xb and look for errors similar to:
      lvm[813]: /dev/nvme0n1p6 excluded: device is not in devices file.

  7. Verify the /home Mount Point

    • Confirm that an entry for /home exists in /etc/fstab.
    • Check mounted filesystems with:
      df -lHT
    • Ensure that /home is not currently mounted.

  8. Check Volume Groups

    • Run sudo vgs and verify that there are no entries for the cs volume group.
    • Check that there are no entries for /dev/nvme0n1p6 by running sudo lvmdevices.

Solution Steps

  1. Add Device to the LVM Devices List

    • Add /dev/nvme0n1p6 to the devices list:
      sudo lvmdevices --adddev /dev/nvme0n1p6

  2. Scan Volume Groups

    • Run sudo vgscan and verify that the cs volume group is now detected.

  3. Activate the Volume Group

    • Activate the cs volume group with:
      sudo vgchange -ay cs

  4. Mount All File Systems

    • Mount all mount points, including /dev/mapper/cs-home to /home using:
      sudo mount -a

After completing the above steps, you should be able to complete the boot process normally.

Conclusion

The LVM issue can be resolved by ensuring the volume group is recognized and activated, allowing the /home mount point to function correctly again.

Dev-mapper-fedora\x2dhome.device/start hangs
Boot hangs waiting for LVM partition to be mounted