This issue occurs if there are two or more virtual machines in the datastore with the same BIOS UUID and occurs when VixDiskLib_Open(Ex) fetches the virtual disk's block map.
During a backup/restore of a virtual machine, VDDK 6.0.0 tries to find requested virtual machine by looking up its BIOS UUID, unlike the earlier VDDK releases that locate a virtual machine using the MoRef. Because a BIOS UUID is not guaranteed to be unique, unlike a MoRef, this new behavior may cause problems after operations such as cloning or out of place virtual machine restore.
This is a known issue affecting VDDK 6.0.
Currently, there is no resolution or workaround.
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