Re: raid10, far layout initial sync slow + XFS question

Hello,

On Sat, 2 Sep 2023 03:23:00 +0700
CoolCold [off-list ref] 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