March 15, 20233 yr 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
March 15, 20233 yr Community Expert Solution 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.
March 15, 20233 yr Author 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!
March 19, 20233 yr Author 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.
March 19, 20233 yr Community Expert Yes, that's a good average, disks are always much slower when they start using the inner tracks.
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