Hello, I tried browsing the forums and reddit for solutions but can't seem to find anything to fix a sudden slow down of write speeds to Unraid. The issue started yesterday and transfer speeds between my Windows PC and Unraid server have dropped dramatically. I am only slightly tech savvy and networking is something that goes right over my head, so sorry if I am missing something very obvious.

 

I attached two diagnostics here because I saw in another thread someone suggested including the diagnostics while a file transfer is active, so the one ending in 1507 is just a regular diagnostic, and the one ending in 1509 was compiled during a file transfer.

 

Also, included a screenshot of the transfer speed. As you can see, the speed is pretty painfully slow around 31 MB/s. I don't recall exactly what my write speeds were before this issue popped up, but I am pretty sure it was closer to 90 MB/s.

 

At first I thought it might be because it stopped writing to my NVME cache drive for reason, but from what I can tell in my settings it still should be write to Cache then transfer to Array. So I don't think that is the issue.

 

Also tried changing Tunable (md_write_method) to "reconstruct write" since I saw someone suggest that in another post as well, but did nothing so I changed it back to the normal "read/modify/write" setting.

 

Tried switching ethernet cables and unplugging my router's power for 10 minutes, but neither did anything.

 

Tried using the Fix Common Problems utility, but it does not show anything as being an issue.

 

I also saw folks say to run iperf3, so I did that and got below results. Seem pretty slow which checks out with my slow write speeds, but like I said I am not network savvy at all so not sure what to make it this:

 

[ ID] Interval           Transfer     Bitrate
[  5]   0.00-1.01   sec  3.38 MBytes  28.0 Mbits/sec
[  5]   1.01-2.01   sec  1.25 MBytes  10.5 Mbits/sec
[  5]   2.01-3.01   sec  8.12 MBytes  67.7 Mbits/sec
[  5]   3.01-4.00   sec  38.0 MBytes   322 Mbits/sec
[  5]   4.00-5.02   sec  43.5 MBytes   361 Mbits/sec
[  5]   5.02-6.01   sec  45.8 MBytes   387 Mbits/sec
[  5]   6.01-7.00   sec  43.4 MBytes   366 Mbits/sec
[  5]   7.00-8.01   sec  45.6 MBytes   380 Mbits/sec
[  5]   8.01-9.00   sec  46.2 MBytes   390 Mbits/sec
[  5]   9.00-10.01  sec  43.0 MBytes   358 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-10.01  sec   318 MBytes   267 Mbits/sec                  sender
[  5]   0.00-10.01  sec   317 MBytes   266 Mbits/sec                  receiver

 

Thank you!

server-diagnostics-20240831-1507.zip server-diagnostics-20240831-1509.zip

iperf only tests the LAN subsystem, so the problem is likely something with that, NICs, cables, switch, client PC, etc.

On 8/31/2024 at 6:45 PM, JorgeB said:

iperf only tests the LAN subsystem, so the problem is likely something with that, NICs, cables, switch, client PC, etc.

What would be the best way to figure out where bottleneck is happening?

 

I haven't changed anything before this issue cropped up. I already tried changing ethernet cables which did nothing so it seems that would not be the issue. My client PC isn't having any other sort of connectivity issues and upload speeds seem fine other than when writing to my Unraid server. I am not using a network switch--my server is wired directly into my router, and my client PC is wired into my mesh wifi node which is wired into my router. Not familiar with NIC and how to test if that is the issue?

2 hours ago, larkhillv said:

my client PC is wired into my mesh wifi node

This could be the problem, WiFi always bad for performance.

7 hours ago, larkhillv said:

my mesh wifi node

Yep, definitely the main suspect.