On rare occasions, after initial power up, the system fails to boot and displays a message:
All of the disks from your previous configuration are gone. If this is an unexpected message, then please power off your system and check your cables to ensure all disks are present. Press any key to continue, or "C" to load the configuration utility.
Workaround
Power cycle the system.
The system should boot normally.
If the system still does not boot, and the same message appears, contact Oracle customer service.