teaguecl Posted March 4, 2022 Share Posted March 4, 2022 I have an Unraid machine I built in 2013 that has served my needs pretty well. It has always been slow, but I didn't think there was anything wrong until recently. I use it to stream movies to my TV over a local network, and it's been plenty fast for that until recently when I upgraded to 4K content which causes buffering. What really worries me is the parity check speed. My setup spends 3-4 days every month doing parity (60 hours, average speed is ~50 MB/sec). I didn't realize that was abnormal until I read a thread recently where everyone else thinks 12 hours is a long time and have average speeds in the 100-200 MB/sec range. During a parity check the array is basically unusable it's so slow (which is normal) - but having my array be inaccessible for 3 days every month is a pain. I built my server with meager specs, but I'm not sure if that's the culprit. RAM doesn't seem to be maxed out, and CPU isn't either. One of the CPU cores spikes up to 80-95% every few seconds - so maybe it's single core performance that is hurting me? Does anyone know why my parity speeds would be so low? They are usually 30MB/sec for the first 4TB, they go up to 40MB/sec up to 8TB and 70MB/sec beyond that. I've attached some screenshots of my setup. Quote Link to comment
Squid Posted March 4, 2022 Share Posted March 4, 2022 You should post your diagnostics Quote Link to comment
teaguecl Posted March 4, 2022 Author Share Posted March 4, 2022 Thanks Squid for the reminder. Diagnostics are attached here. tower-diagnostics-20220303-1634.zip Quote Link to comment
itimpi Posted March 4, 2022 Share Posted March 4, 2022 6 hours ago, teaguecl said: During a parity check the array is basically unusable it's so slow (which is normal) - but having my array be inaccessible for 3 days every month is a pain. Regardless of whether you sort out the parity speed issue you might want to consider installing the Parity Chevk Tuning plugin so you can trade off elapsed time for the check for avoiding it impacting daily use of the server. Quote Link to comment
Solution JorgeB Posted March 4, 2022 Solution Share Posted March 4, 2022 Change the onboard controller from IDE to AHCI/RAID. Quote Link to comment
teaguecl Posted March 17, 2022 Author Share Posted March 17, 2022 Thanks for the help. I switched the BIOS setting from IDE to AHCI and things are looking much better. DiskSpeed results don't look much different, but I started a parity check and it was going at 90MB/sec. That's about 3x faster than before, and brings the parity check time down to about 24 hours - which is great! Quote Link to comment
Recommended Posts
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.