What is system UUID and how to change it?

Solution Verified - Updated -

Issue

What is the meaning of:

  • system.hardware.uuid in the lshal output (RHEL6);
  • /sys/devices/virtual/dmi/id/product_uuid file value (RHEL6 and RHEL7);
  • UUID field value in the dmidecode output,

and can it be changed if necessary?

Environment

  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

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