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The UUID Location and Format
The UUID is stored in the SMBIOS system information descriptor. It can be accessed by standard SMBIOS scanning software for example SiSoftware Sandra or the IBM utility smbios2 and used for system management in the same way you use the UUID of a physical computer.
The UUID is a 128-bit integer. The 16 bytes of this value are separated by spaces, except for a dash between the eighth and ninth hexadecimal pairs. An example UUID looks like this:
00 11 22 33 44 55 66 77-88 99 aa bb cc dd ee ff
The UUID is based on the physical computer's identifier and the path to the virtual machine's configuration file. This UUID is generated when you power on or reset the virtual machine. As long as you do not move or copy the virtual machine to another location, the UUID remains constant.