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

[Xiao Ni]

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

Best Regards
Xiao

On Sat, Oct 9, 2021 at 7:36 AM Song Liu <song@xxxxxxxxxx> wrote:
>
> On Thu, Oct 7, 2021 at 8:22 PM Li Feng <fengli@xxxxxxxxxx> 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@xxxxxxxxxx>
>
> Thanks for the patch! I applied it to md-next, with some changes in the
> commit log.
>
> Thanks,
> Song
>