On Mon, Oct 11, 2021 at 5:42 PM Li Feng [off-list ref] wrote:

Xiao Ni [off-list ref] 于2021年10月11日周一 下午3:49写道：

quoted

Hi all

Now the per device sysfs interface file state can change failfast. Do
we need a new file for failfast?

I did a test. The steps are:

mdadm -CR /dev/md0 -l1 -n2 /dev/sdb /dev/sdc --assume-clean
cd /sys/block/md0/md/dev-sdb
echo failfast > state
cat state
in_sync,failfast

This works,  will it be persisted to disk?

mdadm --detail /dev/md0 can show the failfast information. So it
should be written in superblock.
But I don't find how md does this. I'm looking at this.

Regards
Xiao