shimi269

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    Hight IO wait times and usage *fixed*

    in General Support

    Posted · Edited by shimi269
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    I been experiencing freezes and slowdowns when downloading via LFTP (using NerdPacks) on Unraid, I have managed to narrow it down to some IO issues, as put in the screenshots. But I'm at a loss as to what is causing the issues. I have tried running the download with Docker turned 'on' and 'off' and also by setting the paths to 'mnt/user' and 'mnt/cache', but BTRFS still spikes to 99% usage, and if downloading to 'user' SHFS to 99%. If I download to 'cache' BTRFS still spikes to 99% usage but also LFTP to 99% (as seen in the screenshot below).

     

    iotop.thumb.PNG.58f6693aff3ccd03a9a9b0c12ca69b02.PNG

     

    The dips/freezes in the network, are matching to the spikes in the storage writes, as well as the 99% spikes (screenshot above). I download to the cache only, which then invokes mover every night. My Docker containers are stored on a sperate SSD, and I've eliminated them being the issue, by disabling Docker and running LFTP and still getting the issue.

     

    413950086_Unraidstats.thumb.PNG.a7155ecbb8117cac59057cfdeebb7a4a.PNG

     

    Server Spec:

    i7 2600k

    32GB RAM

    x2 250GB Crucial SSDs

    x4 8TB WD Drives 

    tower-diagnostics-20201125-0958.zip

    LFTP/SFTP 1GB Download spikes and freezes

    in General Support

    Posted

    I've got an issue that I just can't seem to find the root cause of. I have recently upgraded to 1GB fibre, and everything can download at the full advertised speed. Apart from LFTP, it can reach the full bandwidth (using FTP in that case, just to show the issue in the pictures), but LFTP will freeze randomly, the speed will drop, and then spike. I have attached pictures of 3 different runs so showcase this. 

     

    I don't know how LFTP works, but I'm guessing that it downloads to RAM(?), and then get pushed to the SSD cache?? I'm thinking this because the SSD writes are correlating with the Network and CPU dips. But if this is the case, how I can I fix this issue to get my full bandwidth?

     

    I have also attached the test script I am using for now, but I have tried many variations which still give me the same issue.

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    [SOLVED] Slow local wired transfer speeds

    in General Support

    Posted

    14 hours ago, Energen said:

    Instead of using max protocol, I'm using

    server min protocol = SMB3_11
    client min protocol = SMB3_11

     

    I don't know if it actually causes me any problems or not ...  guess I never really bothered to look / investigate...  maybe I should try to get the best settings possible but boy that's a headache to speed test everything reliably...

    Just pull down a file from your SMB share and if you are saturating your network speed, then it's all good. I believe this isn't an issue on all machines running Windows 10, just happened to be the issue with mine.

    [SOLVED] Slow local wired transfer speeds

    in General Support

    Posted

    My Unraid server is connected via ethernet (1000 mbps) and so is my PC. When I transfer a file from Unraid to my PC (via SMB shares) I get 2MB down, and when I transfer a file from my PC to Unraid I get 40MB up.

     

    Now when I use the wireless connection on my PC instead of Ethernet (5Ghz channel) and I transfer a file from Unraid to my PC (via SMB shares) I get 50MB down, and when I transfer a file from my PC to Unraid I get 70MB up.

     

    I have no idea why having a wired connection is giving me a much slower speed!