ikko

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.

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.

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

Thank you so much man. I've been legit losing my mind thinking something was wrong. I appreciate it

I just find it very weird that both SSD pools have the same performance. It feels like there is a bottleneck of something is capping out the read performance in some way. Another thing I did find odd was that I found no difference in performance when I had 3x Samsung SSDs in a pool vs 4x. If this is normal then I guess I really shouldn't be too fussed about it. Just need that confirmation that I'm not going crazy 2x Toshiba 4x Samsung

It seems I have run into a new problem/concern. I have am getting good speeds but I am concerned with the iowait that I believe is related to the read speeds but I'm not 100%. I was benchmarking my lancache and saw really high iowait and the only thing I can think of is the slower than expected read performance. The benchmark show great results but the iowait bothers me. I recently also got two Toshiba px04srb096 and in raid 0 the crystaldiskmark and pv test yeiled similar results compared to my other SSD pool. I searched everywhere trying to figure out what is going on because it seems a bit suspicious to me to be getting extremely similar results. I saw a lot of things on the h730p mini being a possible issue but I'm completely lost as of now Benchmark results: iowait: Updated diagnostics: seraphim-diagnostics-20240926-1806.zip

Yep once again you were right. Sending a file to /dev/null was 2GB/s, and sending it to another pool was about 900MB/s with a max of about 1GB/s.

You were right. The writes were being capped at line speed. I ended up remaking the pool into a raid0 just to test out the speeds but I didn't see an improvement at all in the reads. Just for my sanity is this the best I can expect from the reads? Anyways I appreciate you clearing up my confusion with the line speeds.

Yep it’s over SMB. I’m running on 10gig so bandwidth shouldn’t be an issue. I also did a check with iperf and I was getting close to 10gb both ways. I also did a test with fio and dd and got similar results. I’ll have to run those tests again later to and post the results. I feel like the SSD speeds in particular are very underwhelming. Or is that what I really should be expecting?

Hi, I am new to unraid so I feel like I'm missing stuff or have made a mistake or two when making configurations. But essentially I feel like I am not getting the best speeds possible with ZFS. My cache pool is 4 sata SSDs in raidz but the speeds are nowhere near what I would expect to get. Im not sure if its a hardware limitation of a mistake I've made. Any help would be amazing. Thanks Server: r730xd with H730p mini CPU: Dual Intel(R) Xeon(R) CPU E5-2630 RAM: 64Gb SSD Cache - raidz HDD 6 mirrored vdevs seraphim-diagnostics-20240914-2233.zip