caoc10 Posted March 15, 2023 Share Posted March 15, 2023 Hi everyone, I bought recently a new drive with 8TB to use as parity (until now, my unraid server had no parity) Well, I mounted it, and started the parity sync. The speed of parity sync is, in my opinion, really bad, around 35MB/Sec, which will take days to finish. I've read some posts and did some changes (disabled VM manager and docker, and assure that cache write was turned on). Now, when I start the parity sync, it goes fine (around 170MB/Sec) until aprox. 8%. At this moment, the speed drops to 35MB/Sec. I've identified that at the beginning, the disks are rarely written. When the speed drops, the disk 2 (sdd) is written almost every second. You can find attached the diagnostics, and a print screen of my array. Anyone can give me some hints on how to speed up things? weebuzserver-diagnostics-20230315-1122.zip Quote Link to comment
Solution JorgeB Posted March 15, 2023 Solution Share Posted March 15, 2023 The parity drive is SMR, and while they usually perform mostly normal with sync operations that particular model has been known to sometimes be slow for everything. Quote Link to comment
caoc10 Posted March 15, 2023 Author Share Posted March 15, 2023 Thank you JorgeB. I will try to return this disk and replace it by a Toshiba N300 also with 8TB (Serial No. HDWG480UZSVA). I think that this one is CMR. Once I receive the disk and test it, I will update the thread! Quote Link to comment
JorgeB Posted March 15, 2023 Share Posted March 15, 2023 6 minutes ago, caoc10 said: I think that this one is CMR. It is. Quote Link to comment
caoc10 Posted March 19, 2023 Author Share Posted March 19, 2023 Hi JorgeB. I've already received the new disk and now it is way better. It completed the parity sync in 18h and 30m at an average speed of 120mb/s. My parity drive has 8TB. Do you think that those values are good, or is there any improvement to do? Thank you. 1 Quote Link to comment
JorgeB Posted March 19, 2023 Share Posted March 19, 2023 Yes, that's a good average, disks are always much slower when they start using the inner tracks. 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.