Re: Array will not resync.

[David Niklas <simd@vfemail.net>]

Ah! I needed to issue repair to the sync_action. Thanks!
mdstat looks normal.

David


On Sun, 18 Feb 2024 19:47:19 -0800
"C.J. Collier" <cjac@colliertech.org> wrote:
> Does the content of /proc/mdstat look interesting to you?
> 
> On Sun, Feb 18, 2024, 17:13 Yu Kuai <yukuai1@huaweicloud.com> wrote:
> 
> > Hi,
> >
> > 在 2024/02/19 0:23, simd@vfemail.net 写道:  
> > > Hello,
> > >
> > > I cannot get my RAID 6 array to resync.
> > >
> > > I'm using mdadm version v4.1. I've tried kernels 5.18.X, 6.0.X, and
> > > 6.3.X on Devuan (Debian) Linux.
> > >
> > > % echo resync > /sys/devices/virtual/block/md127/md/sync_action
> > >
> > > Does nothing.
> > >
> > > % mdadm --assemble --update=resync /dev/md127
> > >
> > > Does nothing.  
> >
> > Please note that resync is one-time after assemble the array the first
> > time, you can't resync again after the array is clean.
> >  
> > >
> > > I should see a status change to resync with mdadm
> > > --detail /dev/md127 and hear some activity from the drives.
> > >
> > > I tried adding the verbose option, but it only lists the
> > > recognizing of the drives and adding them to the array.
> > >
> > > The array currently has some mismatches which need to be corrected.
> > > It's currently registering all devices in "active sync" status and
> > > says that it is "clean".  
> >
> > What you want is "echo check > sync_action", then "cat mismatch_cnt",
> > if there are really mismatches, "echo repair > sync_action" to fix it.
> >
> > Thanks,
> > Kuai
> >  
> > >
> > > I tried setting the flag, in misc mode, to readonly and then back to
> > > readwrite but that still doesn't allow the array to be resync'd.
> > >
> > > In desperation, I tried unplugging one of the drives, it holds
> > > most/all of the mismatches -- the SATA cable was going bad, and
> > > then I touch(1)ed  
> > a  
> > > file on the FS and unmounted the FS. Although the array recognized
> > > the failure of the drive, it did not start resync the array upon
> > > adding the drive back into the array.
> > >
> > >
> > >
> > >
> > > Any ideas how to resync the array?
> > >
> > > Thanks,
> > > David
> > >
> > > .
> > >  
> >
> >
> >