There have been many posts involving SAS to SATA breakout cables of the Forward vs Reverse types.  Which type to use where is generally the question.   To make it simple, if the host-controller side is a SAS connector (SFF-8470) and the target side is SATA drives then you must always use a SAS to SATA Forward Breakout Cable.  If The Motherboard/host-Controller side are SATA connectors and the backplane is a SAS connector then you must always use a SAS to SATA Reverse Breakout Cable.  For SATA