Using Dell Perc H310 Sata 3.0 Gbps on Sata 6 Gbps drives

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I have always felt my access to my NAS wasn't snappy enough.  I'm talking about the access to shares.   When initially I did my build on unraid, I'm not well acquainted with SAS/ SATA, HBA controllers yet, and drive speeds.  


With a little free time right now, I tried to check the drives I'm using.  I know some of them are old, and maybe that's the reason.  But with my checking the modes now, I'm shocked that quite a bit of them are actually SATA 3.0, 6 Gbps capable.  And checking my Dell Perc H310, it is SATA 2.0, 3 Gbps only.  Sadly, my motherboard, Supermicro X11SSZ-F only has 4 SATA 3.0 ports, so it's not enough for all 9 drives.


I want to ask, do you think my access to files in array aren't as snappy  as other systems is due to the Perc controller?  Does changing this give significantly better user experience?


Any cheap HBA you can suggest that supports Sata 3.0?  For 8 drives.

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It is unlikely that use of SATA2 is what is limiting your throughput as HDD drives do not exceed SATA2 limits.    It is only when using SSD that SATA3 becomes important.   Having said that there may be some other factor (such as the overall throughput of the controller across all drives) that can be limiting throughput.


You have not mentioned what speeds you are seeing to get feedback on whether the speeds you are seeing are typical of unRAID.    UnRAID is optimised for things other than performance.

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How are your disks set up? Is every disk set to RAID 0 and added individually to the array, or is your H310 set to HBA mode in which it presents all the drives to unRAID?


The H310 is actually a rebranded LSI 9211-8i controller which is SAS/SATA 6Gb/s capable, however the H310 is set to IR mode which introduces RAID functionality. IT mode simply passes through all the drives to unRAID without any RAID function.

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Like mentioned the H310 is SATA3, but unless you're using SSDs there wouldn't be any bottleneck even if it was SATA2.

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Hi!  I've got my controller set to IT mode.  All drives are connected to the controller via fan out cable sff-8087.  I have my SSD Samsung Evo 850 connected to onboard Sata port.  The rest of the drives are all connected to HBA controller.  


My drives are 


1. https://www.storagereview.com/seagate_barracuda_green_2tb_review_st2000dl003   2 units, (Parity) & (Disk 1 of Media Share)

2. https://www.newegg.com/Product/Product.aspx?Item=N82E16822178264 (Disk 2 of Media Share)

3. https://www.newegg.com/Product/Product.aspx?Item=N82E16822236343 (Disk 3 of Media Share)

4. https://www.newegg.com/Product/Product.aspx?Item=N82E16822148413 (Disk 4 of Media Share) 

5. https://www.newegg.com/Product/Product.aspx?Item=N82E16822136798 (Disk 5 of Media Share)

6. https://www.amazon.com/WESTERN-DIGITAL-WD5003ABYZ-500GB-internal/dp/B00FMHE4HQ (single disk share on it's own)

7. & 8. https://www.ebay.com/itm/SUN-HITACHI-HDS7250SASUN500G-500GB-SATA-HARD-DRIVE-P-N-390-0247-05-F-W-REV-AJ0A-/332580218359 (2 of these on the same share, Useless share, I know this will be slow.  Seldom access this share)

9. Samsung Evo 850 connected to onboard SATA port of MB (cache)


How do I test throughput of drives?  Any unraid tools?

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Hi.  Is my Dell Perc H310 slowing down my shares on these drives?




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4 minutes ago, jang430 said:

Hi.  Is my Dell Perc H310 slowing down my shares on these drives?


31 minutes ago, johnnie.black said:

there wouldn't be any bottleneck even if it was SATA2.


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