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apx

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  1. apx's post in SMB transfers directly do HDD disks have half speed. was marked as the answer   
    Hello to this community, would like to ask for some advice/suggestion/idea.

    Setup.
    Plain simple, array is is few 20TB drives, no RAIDs, no parity, no cache...
    1Gbit NIC.

    Copying from Windows machine (1Gbit NIC too) directly to \disk share speeds start at gigabit, but slowly drops to half.

    That's 10GB single file.

    I know that those are turtle speeds, but shouldn't drive sustain speeds at least around ~100MB/s?
    And what could cause those slowdowns?

    iperf tests shows that both machines can exchange at 950Mbits/sec. (should be at least around 100MB/s)
    same drives installed locally maintains speeds around 150MB/s, when same file is copied to it.
    SMB Multi Channel setting didn't changed much.


    Will add cache eventually, but yet not sure if same wont happen with even simplest SATA SSD.


    Solved.
    Settings > Power Mode > Best Performance or Balanced.

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