From: Andy Smith <andy@strugglers.net>
To: NeilBrown <neilb@suse.de>
Cc: linux-raid@vger.kernel.org
Subject: Re: grub-probe: "found two disks with the index 3 for RAID md2" after changing superblock 0.9 to 1.0
Date: Tue, 16 Sep 2014 04:00:24 +0000 [thread overview]
Message-ID: <20140916040023.GG27492@bitfolk.com> (raw)
In-Reply-To: <20140916075458.155ca17a@notabene.brown>
Hi Neil,
On Tue, Sep 16, 2014 at 07:54:58AM +1000, NeilBrown wrote:
> On Mon, 15 Sep 2014 17:12:52 +0000 Andy Smith <andy@strugglers.net> wrote:
> > On Mon, Sep 15, 2014 at 05:00:37PM +1000, NeilBrown wrote:
> > > mdadm --zero-super --metadata=0.90 /dev/sda3
> > >
> > > will remove any 0.90 metadata.
> >
> > Trying that whole the array is running:
> >
> > mdadm: Couldn't open /dev/sda3 for write - not zeroing
> >
> > This needs to be done with the array stopped, presumably?
>
> It's preferred, but if you are really confident (and I think you are), then
> adding --force is justified and should make it work.
Yep, that worked, thank you! No more complaints from grub-probe.
Do you consider it a bug that mdadm does not zero the old metadata
when upgrading it to a new version?
Or do you consider it a documentation issue to explain that it may
be necessary to manually do it?
I think I would've liked grub-probe at least in verbose mode to say
which version of metadata it was reading from where. That would've
been immediately enlightening, so I'll see if they would accept a
patch for that…
Cheers,
Andy
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next prev parent reply other threads:[~2014-09-16 4:00 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-15 6:47 grub-probe: "found two disks with the index 3 for RAID md2" after changing superblock 0.9 to 1.0 Andy Smith
2014-09-15 7:00 ` NeilBrown
2014-09-15 17:12 ` Andy Smith
2014-09-15 21:54 ` NeilBrown
2014-09-16 4:00 ` Andy Smith [this message]
2014-09-18 6:49 ` NeilBrown
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