Why does system not booting after upgrading from 5.4 to 5.11 and not finding the root volume?

Solution Verified - Updated -

Issue

  • Updated Red Hat Enterprise Linux 5.4 to 5.11
  • Rebooted but kernel panic appeared with both old kernel entry and new one too, mentioning that root and all other filesystem volumes not found.

Environment

  • Red Hat Enterprise Linux 5.x

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