SFF-8087 Raid Ports

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I have an LSI raid card (listed below) which has two SFF-8087 ports. What I do not understand is that the card says "The AOC-USAS2LP-H8iR supports up to 240 HDD w/ RAID 0, 1, 5, 6, 10, 50 and 60."

I have 16 drives in a 1u case that I am trying to install raid 10 but as you can see the cable (below) only has 4 sata ports for a total of 8 drives only.

My question is, how can I connect the "240 HDD" (really I only need 16) that they claim?

Raid Card


SFF-8087 Cable


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This is due to the SAS protocol and how it was designed Vs. SATA.

In SAS, the addressing is not bound to a link per device like SATA is. In your case, those 8 ports can address up to 240 when connected into expanders (typically in storage backplanes), or daisy chaining storage arrays.

Keep in mind that your latency and bandwidth is capped to the physical port limits of the card. For you, a maximum of 48Gbps.

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The expanders are cards. The stand alone ones you normally put on a PCI slot for placement, while the backplane versions are smaller and are screwed onto the back of a backplane.

Be careful, some of these do not have a SFF-8087 to SFF-8087 cable for connecting the main card and expander together, or unless you already have one.




Edited by Maxtor storage

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