takezo

you were right, once past 1TB the speed has increased considerably : so the problem is as you say the 1TB disk has a slow speed compared to the 4TB... well I'll look for a new replacement :-/ thank you all very much for your support, you guys are awesome.

its already attached, the last one, here it is tower-diagnostics-20250320-1804.zip

Yes ,but right now it's checking parity and Current Speed: ~49.3 MB/s ,so question here is why so slow?

physical visual inspection only :-) and also run SMART short self-test in each disk that looks are ok

thanks for your support! I paused the parity check to run diagnostics and check the disks. I uploaded another diagnostic with the parity running. tower-diagnostics-20250320-1804.zip

Dear Support Team, I am currently running a Parity-Check on my Unraid server and I am surprised by how long it is taking, considering my setup and the relatively small amount of data in use. Everything appears to be working correctly, but I was expecting a faster check given the current data usage. Is this speed considered normal for my configuration, or could there be an underlying issue affecting performance? I have attached the diagnostics file in case it helps with troubleshooting. Any insights or recommendations would be greatly appreciated. Thank you in advance for your support! takezo tower-diagnostics-20250320-1726.zip