TexasUnraid Posted August 21, 2021 Share Posted August 21, 2021 (edited) So had a BTRFS corruption error on a drive and decided to run a scrub of all my drives to check them out but noticed something odd. The total scrub speed for the system seems to be bottlenecked to around ~800mb/s? AKA, if I start 4x drives scrubbing I get 200mb/s per drive but if I start a 5th drive they all drop to ~160mb/s for the same total system read speed. If I do a parity check on the other hand I can get the full speed of all drives and over 2GB/s easily. The system is a 2x 10c/20t 2680v2 and CPU usage is only around ~30%. I would think adding more scrub jobs would be more threads and thus easily spread over the 40 threads I have. The SAS card can sustain far more then 800mb/s as shown by the parity check. I can't figure out where the bottleneck could be, anyone have any ideas? Edited August 21, 2021 by TexasUnraid Quote Link to comment
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