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I am currently trying to transfer over 300GB from my Mac Pro server to my Synology NAS. I only have my Windows PC I can work from, but I can SSH into both devices. They are both connected to gigabit ethernet, which I have tested and which works very good.

I have tried a few things already, such as SCP, FTP, SMB, and AFP, but they are generally limited to about 30 MB/s. 30 MB/s would mean, theoretically about 480 Mbps on my wired network. I should be able to do ~60 MB/s, as I need to both "upload" and "download" at the same time.

10GB takes about 5 minutes to transfer, meaning I probably need a good 2.5-3 hours before all my files are done transfering.

Is there a faster way than simply using this AFP, as I am doing right now? Maybe I hit a bottleneck somewhere, but I can't really see where that would be.

closed as off-topic by Gerald Schneider, kasperd, Jenny D, mdpc, Dave M Sep 9 '17 at 21:09

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  • Where are you using those SCP / FTP / SMB / AFP? I would start by using SCP from the Mac Pro shell to the NAS. – Tero Kilkanen Sep 6 '17 at 14:36
  • @TeroKilkanen Yes, I am connecting to the NAS from my Mac Pro. I SSH into my Mac Pro and run the commands there. – MortenMoulder Sep 6 '17 at 14:38
  • Test your network connection by iperf. – Mikhail Khirgiy Sep 6 '17 at 17:32
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Are you sure the limit isn't from the HDDs?

SSH with a faster cipher can help:

ssh -c arcfour
scp -c arcfour

Or you could run rsync without sshd, with rsyncd.

Another option is to pipe tar over netcat:

On the receiving end do:
# netcat -l -p 7000 | tar x

And on the sending end do:
# tar cf - * | netcat otherhost 7000

(taken from http://toast.djw.org.uk/tarpipe.html )

  • I'm getting an "no matching ciper found" when trying to use the -c arcfour with SCP. I'll try rsync right after I've installed ipkg, so I can install netcat haha. – MortenMoulder Sep 6 '17 at 14:51
  • man ssh: The list of available ciphers may also be obtained using "ssh -Q cipher". – ptman Sep 6 '17 at 14:52
  • And arcfour is listed there – MortenMoulder Sep 6 '17 at 15:07
  • What about the server you're connecting to? – ptman Sep 6 '17 at 15:07
  • 2
    Okay, doing scp -o Cipher=arcfour made it work. Now I'm doing about 10 MB/s, so that's definitely an improvement in SCP. No where near the speed of SMB, though. – MortenMoulder Sep 6 '17 at 15:08

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