Slow network speed

[Berkyjay]

Hi I wanted to piggy back off of this post because I'm having the same issue. My file transfer speed is topping out at 11MB/s.

My iPerf test is:

The NIC card on my motherboard is:
RJ45 GLAN by Intel® i210+Intel® i219.

The disks I'm using are:
Western Digital 6TB Red WD60EFAX

I've tried all the suggestions in this thread but I am still getting the slow speeds. This issue only started about a month ago. Previously I was regularly getting 50-70MB/s file transfer speeds.

 

[SweetAndLow]

Hi I wanted to piggy back off of this post because I'm having the same issue. My file transfer speed is topping out at 11MB/s.

My iPerf test is:
View attachment 38606

The NIC card on my motherboard is:
RJ45 GLAN by Intel® i210+Intel® i219.

The disks I'm using are:
Western Digital 6TB Red WD60EFAX

I've tried all the suggestions in this thread but I am still getting the slow speeds. This issue only started about a month ago. Previously I was regularly getting 50-70MB/s file transfer speeds.

You have a 100mbps link some place. Check all your switched and Ethernet cables.

 

[Berkyjay]

You have a 100mbps link some place. Check all your switched and Ethernet cables.

When you say 100mps link, are you saying that I have a bad wire or switch some place? Both my cables connecting the PC, NAS, & router are 50ft Cat6 cables. The PC is connected to a Gigabit switch. Right now I'll have to buy another 50ft cable to do some testing by connecting them directly to the router. Is there any other test I can run before I buy another set of cables?

 

[SweetAndLow]

When you say 100mps link, are you saying that I have a bad wire or switch some place? Both my cables connecting the PC, NAS, & router are 50ft Cat6 cables. The PC is connected to a Gigabit switch. Right now I'll have to buy another 50ft cable to do some testing by connecting them directly to the router. Is there any other test I can run before I buy another set of cables?

You look at the color lights on the switch. Green usually means 100mbps and orange is 1000mbps. When you get exactly 11MB/s it's almost always something not being gigabit.

 

[Berkyjay]

You look at the color lights on the switch. Green usually means 100mbps and orange is 1000mbps. When you get exactly 11MB/s it's almost always something not being gigabit.

OK so the lights are definitely green. But strangely I'm not getting around 30-50MB/s on my file transfers. So then I ran another iperf test and I got some intermittent results.

Code:

[ ID] Interval       Transfer     Bandwidth
[332]  0.0- 1.0 sec   111 MBytes   934 Mbits/sec
[332]  1.0- 2.0 sec   112 MBytes   943 Mbits/sec
[332]  2.0- 3.0 sec   111 MBytes   934 Mbits/sec
[332]  3.0- 4.0 sec   111 MBytes   934 Mbits/sec
[332]  4.0- 5.0 sec   110 MBytes   925 Mbits/sec
[332]  5.0- 6.0 sec  5.70 MBytes  47.8 Mbits/sec
[332]  6.0- 7.0 sec  13.9 MBytes   116 Mbits/sec
[332]  7.0- 8.0 sec  14.7 MBytes   124 Mbits/sec
[332]  8.0- 9.0 sec  0.00 MBytes  0.00 Mbits/sec
[332]  9.0-10.0 sec  0.00 MBytes  0.00 Mbits/sec
[332] 10.0-11.0 sec  0.00 MBytes  0.00 Mbits/sec
[332] 11.0-12.0 sec  0.16 MBytes  1.38 Mbits/sec
[332] 12.0-13.0 sec  87.8 MBytes   736 Mbits/sec
[332]  0.0-32.8 sec   726 MBytes   185 Mbits/sec
write failed: Connection reset by peer
read on server close failed: Connection reset by peer
Done.

This is after I cycled the switch on & off.

And now it's back to the slower speed:

Code:

[ ID] Interval       Transfer     Bandwidth
[212]  0.0- 1.0 sec  11.4 MBytes  95.8 Mbits/sec
[212]  1.0- 2.0 sec  11.2 MBytes  93.7 Mbits/sec
[212]  2.0- 3.0 sec  11.2 MBytes  93.7 Mbits/sec
[212]  3.0- 4.0 sec  11.2 MBytes  93.7 Mbits/sec
[212]  4.0- 5.0 sec  11.2 MBytes  93.7 Mbits/sec

I'm wondering if the switch is failing.

 

[Berkyjay]

You look at the color lights on the switch. Green usually means 100mbps and orange is 1000mbps. When you get exactly 11MB/s it's almost always something not being gigabit.

Hey so before I was able to get my replacement network hardware, my network speeds to my NAS improved back to their original numbers and it's stayed that way for the last few days. The only thing I can think of that was causing the issue is that I was doing a lot of migrating data around on my NAS. So is it possible that the process of resilvering tens of TBs of data in my pools was slowing down the read/write speeds thus slowing down the network transfer speeds?