May 4, 20251 yr Recenlty I started experiencing some pretty slow transfers. I ran a pv test on some failes around 15Gb and 60Gb sending them from one fast pool to another only getting about 500MB/s. Both pools are using a stripped Vdev config. After stopping and starting the array I ran the tests again and they were at ~1.16GiB/s. I left it for a few minutes and did the same tests again and it dropped back down to ~500Mb/s Transfer results after array restart Transfer results 5 minutes after Im not sure what is wrong or there is just something I am not understanding but help would be much appreciated. seraphim-diagnostics-20250505-0929.zip
May 5, 20251 yr Community Expert Open a new terminal window and post the results of zpool iostat -vyl 30 1 taken in the middle of the transfer, note that will take 30 secs to show the output, so make sure it's a large enough file.
May 5, 20251 yr Author 5 hours ago, JorgeB said: Open a new terminal window and post the results of zpool iostat -vyl 30 1 taken in the middle of the transfer, note that will take 30 secs to show the output, so make sure it's a large enough file. Test 1 - File to null Test 2 - Pool to pool I've also been getting some really bad transfers over the network. Swapped out the NIC unraid server and still no improvement. The unraid server is able to receive at 10Gb/s but is able to only sending at 5Gb/s when doing Iperf. I noticed the transfer speeds internally being slower too so I thought this might be the issue. But not too sure yet.
May 5, 20251 yr Community Expert Pools look normal, issue may be elsewhere, anything else using the CPU? And is it boosting correctly? Note that transfers like that are single threaded.
May 6, 20251 yr Author 12 hours ago, JorgeB said: Pools look normal, issue may be elsewhere, anything else using the CPU? And is it boosting correctly? Note that transfers like that are single threaded. Ye looks like its a CPU usage thing. Doing an initial test the CPU usage is 80% then doing it later is 60% with a lower result. I was hoping that it was an issue with my pools or drive. So the root issue is something to do with my networking. Doing an iperf test from my PC to unraid is 1GB/s but going unraid to PC is only 500MB/s Unraid to PC PC to Unraid For some reason running it again from PC to unraid the speeds have gone down again.
May 6, 20251 yr Community Expert Iperf results are typically tied to network only, so NICs, or its drivers/settings, cables, switch, client PC, etc.
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.