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I'm afraid this is going to be a very noob question, sorry.

I am looking at the RES2SV240 card from Intel. I have never used SAS or an expander, and I'm a bit confused about how it works.

First, the description on their website says the card has 8 SFF-8087 connectors. The picture next to it only shows 6 connectors. Is that a mistake in the description?

Second, and really my main question, how does one connect this up? From other discussions I've read, the PCIe connector is only for power. So if I connect the 6 connectors to 24 HDDs, how do I connect the RAID/JBOD controller? Or do I have to keep at least one SFF-8087 to connect to the controller and therefore be limited to 20 HDDs?

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marked as duplicate by ewwhite, Dave M, Chris S Feb 10 '14 at 5:20

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

I'm on an anti-Intel kick of late as their products have been causing another SF user headaches. Make sure you read Ed's answer in the Dupe question and get a feel for what the DIY community before jumping in. – Chris S Feb 10 '14 at 5:23
It certainly does seem to be a typo on their website. There is clearly only 6 ports, and 6x4 = 24 so that all adds up. – Mark Henderson Feb 10 '14 at 5:27

The product brief is explicit on the number of connectors:

Six SFF8087 SAS/SATA connectors for attaching up to 24 targets or initiators

And yes, you would need to "sacrifice" at least one port for controller connection.

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