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RT-AC68U & Merlin very slow data transfer to NAS

Discussion in 'Asuswrt-Merlin' started by anotherengineer, Jun 1, 2020.

  1. anotherengineer

    anotherengineer Regular Contributor

    Joined:
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    Northern Ontario Canada
    Hi everyone,

    I am copying some files from my win10 pc to my synology NAS, file speeds are about a dismal 2MB/s, they used to be about 80MB/s.

    Is there any router firmware (Merlin) settings I should check to rule out the router as a possible bottleneck??

    PC - is connected to router cat 6a and NAS is connected to router cat 6a.

    Thanks
     
  2. ColinTaylor

    ColinTaylor Part of the Furniture

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    If both devices are plugged directly into the router's LAN ports then there's nothing that can be configured on the router that would have any effect. The data is going directly between the switch ports (just like a dumb switch), it's not going "through" the router.
     
    anotherengineer likes this.
  3. anotherengineer

    anotherengineer Regular Contributor

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    Thanks

    So issue more than likely is the NAS or NAS settings.
     
  4. L&LD

    L&LD Part of the Furniture

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    Or cables used. :)
     
  5. anotherengineer

    anotherengineer Regular Contributor

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    lol ya, would hope not, but never know. maybe the connectors in the wall plates.
     
    L&LD likes this.
  6. hshah

    hshah Occasional Visitor

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    anotherengineer likes this.
  7. anotherengineer

    anotherengineer Regular Contributor

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    Thanks I will take a look. It's a DS712+ w/4GB ram 2 drives raid 0 - 0.56TB o f 2TB used
     
  8. hshah

    hshah Occasional Visitor

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    I think my NAS slows down when the free space drops below 50GB because of the SHR2 (RAID 6) setup. You wouldn't have that issue.

    How are you accessing the share? Have you tried using the IP address instead of the hostname (or vice versa)? I had been using the hostname for a while, but then a couple of months ago my main PC (Windows 10 - running Insider builds) would randomly stop resolving the hostname until I rebooted it. I could access every other device on my network with their respective hostnames (including the second NAS) and other computers could access the primary NAS. I ended up using the IP address instead and everything has been fine since.

    I can't remember exactly what I did to sort out the slow transfer speeds... it was a few years ago and knowing me, I probably made multiple changes all at the same time so wouldn't be able to say exactly what resolved it.

    I do remember it occurring multiple times though, and determined that it was caused by either a DSM or Windows update. There are loads of threads about this issue on the Synology forums, going back quite a few years. To help you out, I've quickly gone through some of the threads and listed below the things I know I've done:
    • disabled IPv6 on the Synology
    • disabled IPv6 on the Windows machine
    • enable NetBIOS over TCP/IPv4 (Adaptor settings > Advanced > WINS)
     
    anotherengineer likes this.
  9. anotherengineer

    anotherengineer Regular Contributor

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    Location:
    Northern Ontario Canada
    Thanks

    I did the first two bullets on your list and transferred an win iso through windows file explorer to the NAS
    PC to NAS - 113MB/s
    Nas to PC - 108MB/s down to 77MB/s then back to 100-ish again, up and down (probably a buffer or cpu limitation in the NAS?)

    So all good now at least for single large files. I will try a 4GB folder of pictures later and see how that works, I know multiple smaller files are slower, but it was less then a MB/s before, a crappy usb 2 key was way faster, so we'll see.

    Thanks for the help/pointers.
     
    hshah likes this.
  10. L&LD

    L&LD Part of the Furniture

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    USB 2.0 is faster than over a 1Gbps connection for small files (depending on the quality of the USB drive and how small the files are). :)