Depends on how "Enable auto start" is set in Settings -> Disk Settings, but it's not a problem if the array starts, lets to this step by step, start with connecting the old disk3 to the server, go to UD settings and change the XFS UUID for that disk, then you can have the array started and the old disk mounted at the same time, at that point compare the data from the emulated disk3 with old disk3 to see which one is in better shape, note that old disk3 has a SMART problem error that might indicate that data there cannot always be trusted, though in my experience most or even all should be OK, so it would be a good idea to play/check a few files to make sure it looks good.