Re: RAID1 removing failed disk returns EBUSY

[Xiao Ni <xni@redhat.com>]

----- Original Message -----
> From: "Joe Lawrence" <joe.lawrence@stratus.com>
> To: "Xiao Ni" <xni@redhat.com>
> Cc: "NeilBrown" <neilb@suse.de>, linux-raid@vger.kernel.org, "Bill Kuzeja" <william.kuzeja@stratus.com>
> Sent: Friday, January 23, 2015 11:11:29 PM
> Subject: Re: RAID1 removing failed disk returns EBUSY
> 
> On Tue, 20 Jan 2015 02:16:46 -0500
> Xiao Ni <xni@redhat.com> wrote:
> > Joe
> > 
> >    Thanks for the explanation. So echo "idle" to sync_action is a
> >    workaround
> > without the patch.
> >  
> >    It looks like the patch is not enough to fix the problem.
> > Do you have a try with the new patch? Is the problem still exist in
> > your environment?
> > 
> >    If your environment have no problem, can you give me the version number?
> >    I'll
> > have a try with the same version too.
> 
> Hi Xiao,
> 
> Bill and I did some more testing yesterday and I think we've figured
> out the confusion.  Running a 3.18+ kernel and an upstream mdadm, it
> was the udev invocation of "mdadm -If <dev>" that was automatically
> removing the device for us.
> 
> If we ran with an older mdadm and got the MD wedged in the faulty
> condition, then nothing we echoed into the sysfs state file ('idle'
> 'fail' or 'remove')  would change anything.  I think this agrees with
> your testing report.
> 
> So two things:
> 
> 1 - Did you make / make install the latest mdadm and see it try to run
> mdadm -If on the removed disk?  (You could also try manually running
> it.)

  I make sure I have install the latest mdadm
  [root@dhcp-12-133 ~]# mdadm --version
  mdadm - v3.3.2-18-g93d3bd3 - 18th December 2014

  It can prove this, right?

  It's strange when I ran mdadm -If

[root@dhcp-12-133 ~]# mdadm -If sdc
mdadm: sdc does not appear to be a component of any array
[root@dhcp-12-133 ~]# cat /proc/mdstat 
Personalities : [raid1] 
md0 : active (auto-read-only) raid1 sdd1[1] sdc1[0](F)
      5238784 blocks super 1.2 [2/1] [_U]
      
unused devices: <none>

  I unplug the device manually from the machine. The machine is on my desk.


> 
> 2 - I think the sysfs interface to the removed disks is still broken in
> cases where (1) doesn't occur.
> 
> Thanks,
> 
> -- Joe
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