Re: [PATCH RESEND] md: allow to set the fail_fast on RAID1/RAID10

[Li Feng]

Xiao Ni <xni@xxxxxxxxxx> 于2021年10月12日周二 下午2:58写道：
>
> On Mon, Oct 11, 2021 at 5:42 PM Li Feng <fengli@xxxxxxxxxx> wrote:
> >
> > Xiao Ni <xni@xxxxxxxxxx> 于2021年10月11日周一 下午3:49写道：
> > >
> > > 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.
>
Yes, I have tested that it has been persisted, but don't understand who does it.

> Regards
> Xiao
>