Slow transfer speeds over 10 gig network

[ryouksan]

Good morning, I'm having issues with transfer speeds from windows pc to unraid share. I've been reading the forum for the past week and haven't been able to solve my problem, tried direct IO on, jumbo packets, turbo write enabled and don't know what else.

when I copy a large document from windows to unraid it peaks at about 1100 MB/s and then drops to under 100 MB/s

iperf3 performs just fine:

 

C:\Tools>iperf3.exe -c 169.254.173.238
Connecting to host 169.254.173.238, port 5201
[  4] local 169.254.239.111 port 50008 connected to 169.254.173.238 port 5201
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-1.00   sec  1.09 GBytes  9.37 Gbits/sec
[  4]   1.00-2.00   sec  1.09 GBytes  9.36 Gbits/sec
[  4]   2.00-3.00   sec  1.09 GBytes  9.37 Gbits/sec
[  4]   3.00-4.00   sec  1.09 GBytes  9.34 Gbits/sec
[  4]   4.00-5.00   sec  1.09 GBytes  9.36 Gbits/sec
[  4]   5.00-6.00   sec  1.09 GBytes  9.39 Gbits/sec
[  4]   6.00-7.00   sec  1.09 GBytes  9.38 Gbits/sec
[  4]   7.00-8.00   sec  1.09 GBytes  9.35 Gbits/sec
[  4]   8.00-9.00   sec  1.09 GBytes  9.34 Gbits/sec
[  4]   9.00-10.00  sec  1.09 GBytes  9.32 Gbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-10.00  sec  10.9 GBytes  9.36 Gbits/sec                  sender
[  4]   0.00-10.00  sec  10.9 GBytes  9.36 Gbits/sec                  receiver

iperf Done.

serverdrone-diagnostics-20221207-1144.zip

[JorgeB]

39 minutes ago, ryouksan said:

when I copy a large document from windows to unraid it peaks at about 1100 MB/s and then drops to under 100 MB/s

This suggests a device problem, i.e., it doesn't keep up with the write speed needed, not all SSDs can sustain 500MB/s+ writes, in fact most can't.

[ryouksan]

1 hour ago, JorgeB said:

This suggests a device problem, i.e., it doesn't keep up with the write speed needed, not all SSDs can sustain 500MB/s+ writes, in fact most can't.

Thank you for the answer, I will try to test the ssd and eventually change it then.