VMware GSX Server 3 Administration Manual page 174

VMware GSX Server Administration Guide
4. The first time you power on the virtual machine, you are asked to keep the
existing UUID or create a new one.
If you are using the UUID for management purposes, you should select Keep,
then click OK to continue powering on the virtual machine. For more
information about the UUID, see Identifying a Virtual Machine by Its UUID on
page 123.
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