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Thread: ZFS raidz low read speed

  1. #11
    Junior Member
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    Jun 2011
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    It has 4 internal and 2 eSATA so I will test what I can. I still can return the card if it is the problem, any recommendations for a replacement.

  2. #12
    Senior Member
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    May 2011
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    i can recommend this one with high marks

    LSI Internal SATA/SAS SAS3081E-R 3Gb/s

    you can get it from newegg for $200 not including cables.
    http://www.newegg.com/Product/Produc...82E16816118100

    you'll need 2 SFF-8087 MiniSAS to 4 SATA Breakout Cable

    here are 3 options, different lengths and connector angles ($20 - $30 each):
    http://www.newegg.com/Product/Produc...-080-_-Product
    http://www.newegg.com/Product/Produc...-082-_-Product
    http://www.newegg.com/Product/Produc...-081-_-Product

  3. #13
    Matt it may not necessarely be the card itself, but rather the PCI bus on your motherboard that's rather slow. So even if you do replace the card you may still have the same results.

  4. #14
    Junior Member
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    Jun 2011
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    I a pci express 4x on quality motherboard I doubt that is the problem. Also it was the only card in the system. Even if so why would the write be 4 times faster than the read on a 500GB file, to effectively remove caching from the equation.

  5. #15
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    An update. I have now LSI Internal SATA/SAS SAS3081E-R 3Gb/s and
    http://www.newegg.com/Product/Produc...-080-_-Product cables but now the card will not detect any of my drives. Is my build just cursed?

  6. #16
    Senior Member
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    May 2011
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    when your system is booting, does the card list the drives?

    while your system is booting there should be some key combo to enter the bios for the card. take a look in there.

    next time i reboot, I'll take a look and see if i remember tweaking something.

  7. #17
    Junior Member
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    Jun 2011
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    No it only detects one drive and it is listed as disk 7 in the card config.

  8. #18
    Senior Member
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    May 2011
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    Quote Originally Posted by Matt View Post
    No it only detects one drive and it is listed as disk 7 in the card config.
    finally got around to rebooting. i took screen shoots of all the pages of my controller.2011-07-18.21.00.05.jpg2011-07-18.21.00.45.jpg2011-07-18.21.01.10.jpg2011-07-18.21.03.40.jpg2011-07-18.21.04.17.jpg

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