June 14, 20242 yr Hey folks, I am transferring a file from my cache (https://www.micron.com/products/storage/ssd/client-ssd/2400-ssd - the 512GB version) to my array. The data transfer rate is seems very slow: > 9,394,687,673 100% 13.77MB/s 0:10:50 (xfr#1, to-chk=0/2) 13.77MB/s seems slow. By contrast, the parity check was showing an average of 60MB/s: > Duration: 1 day, 13 hours, 19 minutes, 49 seconds. Average speed: 59.5 MB/s What could be wrong with my setup? I am transferring a large (10GB, roughly) file using `rsync` from my NVME SSD to my HDD arrays. Any thoughts?
June 14, 20242 yr Community Expert Try enabling turbo write, if still slow post diags during the transfer.
June 14, 20242 yr Author 8 hours ago, JorgeB said: Try enabling turbo write, if still slow post diags during the transfer. Thank you for this piece of advice. Things did speed up significantly: > 13,342,405,607 100% 21.66MB/s 0:09:47 (xfr#2, to-chk=0/3) I'm attaching the logs here (taken during transfer) in case there is a way to get better performance. Something still seems off, but maybe this is my expectations being wrong? P.S. Given how much fun I am having with unRAID and how great you have all been at support, I am basically at the point of buying a license. unraid-diagnostics-20240614-0939.zip Edited June 14, 20242 yr by stevenxl Forgot attachment.
June 14, 20242 yr Community Expert No storage related errors, but I do see you are using USB, that is not recommended for array or pool devices for multiple reasons, one of them is that performance can be spotty.
June 16, 20242 yr Author On 6/14/2024 at 10:20 AM, JorgeB said: No storage related errors, but I do see you are using USB, that is not recommended for array or pool devices for multiple reasons, one of them is that performance can be spotty. I understand the concern regarding USB connection, but I was doing the parity check on that same setup and it was doing 60MB/s. What would explain a drop to 25MB/s?
June 17, 20242 yr Author On 6/16/2024 at 3:47 AM, JorgeB said: USB speed could have degraded. Hm... the parity check was ran less than 30 days ago. You think the USB speed would have degraded in that time? I think I'll try a cache -> disk transfer to see what happens when FUSE is by-passed.
June 17, 20242 yr Community Expert Solution 52 minutes ago, stevenxl said: You think the USB speed would have degraded in that time? I meant a degraded link, that can happen at anytime, try rebooting or using a different USB cables, but I'm afraid I cannot really help troubleshooting USB enclosures, and they can be a lost cause.
June 18, 20242 yr Author 23 hours ago, JorgeB said: I meant a degraded link, that can happen at anytime, try rebooting or using a different USB cables, but I'm afraid I cannot really help troubleshooting USB enclosures, and they can be a lost cause. That is fair. Thank you!
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