• Slow scp transfers to /tmp [Version: 6.9.0-beta25]


    Falkinator
    • Minor

    I'm running Version: 6.9.0-beta25 while I wait for the final release.

     

    Server is a Dell T340 with 64GB of RAM.

     

    On a wired Gigabit connection when transferring data to /tmp I'm seeing an initial burst of data (99MB/s), and then it falls to under 10MB/s after 6 seconds and keeps declining.

     

    Transferring the same file to an nvme mounted drive is SOMETIMES FAST, it maintains the 100MB+ speed for the entire transfer.  Other times it will have varying rates of transfer.

     

    Transferring the same file to a Centos 7 VM running on the unraid server is ALWAYS FAST.

     

    It seems that /tmp is ALWAYS SLOW.

    Steps to replicate:

    #create 600MB file
    >dd if=/dev/urandom bs=1024 count=600000 of=/tmp/random.data
    >scp /tmp/random.data root@unraid-server:/tmp

     

    /tmp info:

    root@Rocinante:/tmp# df -h /tmp
    Filesystem      Size  Used Avail Use% Mounted on
    rootfs           32G  1.4G   30G   5% /

    Wireshark IO graph attached.

    Screen Shot 2021-01-20 at 12.02.30 PM.png




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  • Status Definitions

     

    Open = Under consideration.

     

    Solved = The issue has been resolved.

     

    Solved version = The issue has been resolved in the indicated release version.

     

    Closed = Feedback or opinion better posted on our forum for discussion. Also for reports we cannot reproduce or need more information. In this case just add a comment and we will review it again.

     

    Retest = Please retest in latest release.


    Priority Definitions

     

    Minor = Something not working correctly.

     

    Urgent = Server crash, data loss, or other showstopper.

     

    Annoyance = Doesn't affect functionality but should be fixed.

     

    Other = Announcement or other non-issue.