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I have an RPC-4224 case that has 24 bays with 6 Mini SAS ports. I needed a cable to break out one of them into 4 SATA ports, so I went down to my local Fry's Electronics and bought one. The cable came with a "sideband" cable that says optional on it.

I installed it in the box and my hard drives aren't showing up in the EFI/BIOS setup. I see other cables online, specifically one from Norco (the case manufacturer) that doesn't have that "sideband" cable.

My question is, are there different types of Mini SAS to 4x SATA cables? And if so, how do I tell the difference?

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2 Answers

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There are multiple types of SAS connectors. Generally mini-SAS will be SFF-8086 or SFF-8087; according the the product page your case uses 8087.

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There is an excellent answer to this question in a post by barrygordon over on the unRAID Server Community:

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 to SATA you just use a "SATA" cable as there is only one type, although they do come in different lengths. For SAS to SAS connections there is also just a single cable type.

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