Hello, On Sat, 2 Sep 2023 03:23:00 +0700 CoolCold <coolthecold@xxxxxxxxx> wrote: > So the strange thing I do observe, is its initial raid sync speed. > Created with: > mdadm --create /dev/md3 --run -b none --level=10 --layout=f2 > --chunk=16 --raid-devices=4 /dev/nvme0n1 /dev/nvme4n1 /dev/nvme3n1 > /dev/nvme5n1 > > sync speed: > > md3 : active raid10 nvme5n1[3] nvme3n1[2] nvme4n1[1] nvme0n1[0] > 7501212288 blocks super 1.2 16K chunks 2 far-copies [4/4] [UUUU] > [=>...................] resync = 6.2% (466905632/7501212288) > finish=207.7min speed=564418K/sec Any difference if you use e.g. --chunk=1024? How about a newer kernel (such as 6.1)? -- With respect, Roman
