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Druva Documentation

Kernel panic error on the backup proxy

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Problem description

Backup proxy shows the following message:
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

Cause

This error might occur due to the following reasons:

  • Insufficient disk space when the root partition is mounted
  • Corruption in Grub wherein the INITRD does not get mounted to load the kernel

Resolution

  1. Reboot the backup proxy in the Advanced mode.
  2. Select the older version of the kernel. For example, kernel-3.10.0-352.1.2.el7.x86_64.rpm.
  3. Run the yum reinstall kernel to install the latest version of the kernel. For example,  yum reinstall kernel-3.10.0-1062.1.2.el7.x86_64.rpm.
  4. Reboot the machine and the error should no longer appear.
  5. Verify the connection to phoenix.druva.com and vCenter on the port 443.
  6. Ensure that the status of the backup proxy appears as ‘connected’ on the Phoenix Management Console.