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SAS vs SAS2 / SATA ii vs SATA iii Backplane

Last response: in Business Computing
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July 19, 2013 9:07:59 AM

I am building out a new server and I am using a Supermicro SC745 TQ-R920B chassis. My mobo and raid controllers are both SAS2/SATA iii. The backplane on the chassis is a SAS743TQ, which is listed as a SAS and not a SAS 2 backplane. Now it seems to me the besides basic diagnostics a backplane is just a physical connection and so it would not matter. So my question is, will that backplane work with SATA iii/SAS2? Thanks!

More about : sas sas2 sata sata iii backplane

July 19, 2013 2:41:06 PM

You most likely are correct, but I suggest you contact Supermicro to make sure. It doesn't matter unless you use SSDs because even a 15K SAS drive won't saturate a SAS link.
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July 19, 2013 2:44:08 PM

GhislainG said:
You most likely are correct, but I suggest you contact Supermicro to make sure. It doesn't matter unless you use SSDs because even a 15K SAS drive won't saturate a SAS link.


I am using 4 500GB Samsung 840 pro SSDs. They responded after I posted and seemed to agree that it was controller and drive dependent only.
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Best solution

July 19, 2013 2:47:37 PM

While technically they are going to be compatible, that doesn't mean they are going to be fully SAS/SATA 6Gbps supported. Sometimes backplanes, along with other connectors for SATA/SAS are known for not fully supporting the throughput of the newest standards and while the drives will connect, they will operate at the lower supported speed. This means that while you may have the drives recognized in BIOS or by the RAID controller, they may only be operating at SATA 3 Gbps connection. You can test with some benchmarking utilities, but I would suggest contacting to Supermicro directly for confirmation about this, as yes it could be an issue when it comes to providing ideal throughput.
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