linux-kernel - Re: [PATCH RESEND] md: allow to set the fail

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Message-ID: <CAHckoCyuqxM8po4JA4=OacVWhYuo9SWescUVOKRFGwdc=aoN8A@mail.gmail.com>
Date:   Mon, 11 Oct 2021 17:42:35 +0800
From:   Li Feng <fengli@...rtx.com>
To:     Xiao Ni <xni@...hat.com>
Cc:     Song Liu <song@...nel.org>,
        "open list:SOFTWARE RAID (Multiple Disks) SUPPORT" 
        <linux-raid@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RESEND] md: allow to set the fail_fast on RAID1/RAID10

Xiao Ni <xni@...hat.com> 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?

>
> Best Regards
> Xiao
>
> On Sat, Oct 9, 2021 at 7:36 AM Song Liu <song@...nel.org> wrote:
> >
> > On Thu, Oct 7, 2021 at 8:22 PM Li Feng <fengli@...rtx.com> wrote:
> > >
> > > When the running RAID1/RAID10 need to be set with the fail_fast flag,
> > > we have to remove each device from RAID and re-add it again with the
> > > --fail_fast flag.
> > >
> > > Export the fail_fast flag to the userspace to support the read and
> > > write.
> > >
> > > Signed-off-by: Li Feng <fengli@...rtx.com>
> >
> > Thanks for the patch! I applied it to md-next, with some changes in the
> > commit log.
> >
> > Thanks,
> > Song
> >
>