Red Hat NETSCAPE MANAGEMENT SYSTEM 4.5 Manual do Utilizador descarregar pdf (Página 187)

Configuring and Running Virtual Machines

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Modifying the SMBIOS UUID

Each ESX Server virtual machine is automatically assigned a universally unique

identifier (UUID), which 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 systems management in the same ways

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. So a sample UUID

might look like this:

00 11 22 33 44 55 66 77-88 99 aa bb cc dd ee ff

Generating the UUID Automatically

The automatically generated 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. The UUID that is generated remains the same

so long as the virtual machine is not moved or copied.

The automatically generated UUID is also written to the virtual machine’s

configuration file as the value of uuid.location.

If you move or copy the virtual machine, a new UUID is generated when the virtual

machine is powered on — based on the physical computer’s identifier and path to

the virtual machine’s configuration file in its new location.

If you suspend and resume a virtual machine, this does not trigger the process that

generates a UUID. Thus, the UUID in use at the time the virtual machine was

suspended remains in use when the virtual machine is resumed, even if it has been

copied or moved. However, the next time the virtual machine is rebooted, the UUID is

generated again. If the virtual machine has been copied or moved, the UUID is

changed.

In some circumstances — for example, if you are moving the virtual machine but

want to keep the same UUID — you may want to assign a specific UUID to the virtual

machine. In that case, you need to override the automatically generated UUID value.

To do so, edit the virtual machine’s configuration file as described in this section to set

the value of the parameter uuid.bios.

Comparing the Generated UUID to Configuration File Parameters

When a virtual machine is powered on, ESX Server generates a UUID as described

above and compares it to the values for uuid.location and (if it exists)

uuid.bios in the configuration file.

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Red Hat NETSCAPE MANAGEMENT SYSTEM 4.5 Manual do Utilizador Página 187