Sata SSD on a SAS/SATA Connector

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goldorak

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Apr 8, 2010
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I have recently got a Lenovo Thinkstation S30 Workstation with 3 Disks, all of them with SATA interfaces. One is an SSD 256 GB SATA 6, One is a HDD 10000rpm 2.5 inch, and 1 is a 3TB 7200 rpm drive.

All of them are connected to what is named by lenovo as SATA/SAS connectors (they are 3), while the remaining connectors are labeled either SATA2 or SATA3. The SSD is either the samsung 840 or 830; cant get to know exactly which one because it is not put as such on the drive, what exists is MZMPC256HAFU-000L9.

The following lines were taken from the manufacturer specs webpage:
(2) x SATA Connectors, Gen. 2 (AHCI)(2) x SATA Connectors, Gen. 3 (AHCI)
(3) x SATA/SAS Connectors, Gen. 2 (SCU)
* SAS drives on SCU require SAS HDD enablement module to function

My question would be, are the drives (specifically the SSD) better put on the SATA 6 connectors, or are they fine on the SATA/SAS connectors? in other words, am I benefeting of using the SSD on the SATA/SAS connector since it is anyhow SATA?
 
Solution
Dereck47


Download and run ATTO benchmark software.
Test your SSD on the SATA/SAS connector, and again on the SATA 6Gb/s connector. See which port gives you the fastest Read/Write performance.

HDDs can be SATA 3 (6Gb/s) "compatible", not 6Gb/s "capable".
No HDD can spin fast enough to achieve 6Gb/s speeds.
So it doesn't matter where you connect your HDDs; you will get the same Read/Write speeds regardless.
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Dereck47

Dereck47

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Jan 20, 2011
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Download and run ATTO benchmark software.
Test your SSD on the SATA/SAS connector, and again on the SATA 6Gb/s connector. See which port gives you the fastest Read/Write performance.

HDDs can be SATA 3 (6Gb/s) "compatible", not 6Gb/s "capable".
No HDD can spin fast enough to achieve 6Gb/s speeds.
So it doesn't matter where you connect your HDDs; you will get the same Read/Write speeds regardless.
 
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Solution
popatim

popatim

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the sas ports on a c602 chip are 3gb/s. The SSD is better moved to the sata3 (6gb/s) ports unless it is in caching mode which is not available on the straight sata ports. otherwise HDD's can stay where they are as only a hybrid drive can saturate a sata2 port.
 
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goldorak

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Apr 8, 2010
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Hi Guys, I have today casually "tested" the speed of the SSD on the SAS ports and on the SATA 6GB ports, the speeds on the SAS ports could not go over 280 MB/sec while when I connected it to the SATA 6GB port, it reached 500 MB/sec, so i removed all disks from the SAS SCU since anyhow I am not doing any RAID or using any Native SAS disk. And i have put the SSD and the 10000 rpm drives on sata 6GB ports, and the 7200 rpm and DVD on the SATA 3GB ports, and disabled the SAS SCU module to save unecessary ressources.
I feel comfortable with this solution but I didnt feel super speeds in windows startup time.
 
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