Both yes and no, certainly depends on what your setup, I had only volumes created (not Raid) On the DS original system disk, copy the data I first.
Then install a new sytemdisken with xpenology (same 4.3 as the DS) with all the apps I had in the original DS.
Then I moved just over the second disk 'Volume2' (physically), the system said although it was wrong on Volume2 (though the data was ok) but I let the system repair and then everything was left on the volume No.2.
But I had backed up everything just in case (you never know what can go wrong)
sorry for mine bad english hope you understand what I meant ..