From mboxrd@z Thu Jan  1 00:00:00 1970
From: NeilBrown <neilb@suse.com>
Subject: Re: Recovering a RAID6 after all disks were disconnected
Date: Sat, 24 Dec 2016 09:50:26 +1100
Message-ID: <87a8bmp8el.fsf@notabene.neil.brown.name>
References: <CAOxFTczhq3Gr4WW=-sMamaYDmAoMFGh7kkanwJzhXe5NBdMHHQ@mail.gmail.com> <22600.7486.444800.536687@quad.stoffel.home> <CAOxFTczn4Su6KwjDGS0S5BrUdirv9Tu_zCeo26iFMvL3378xpw@mail.gmail.com> <22601.44638.79418.124438@quad.stoffel.home> <CAOxFTcwYujHCHeiJiwUc4aA5RpN_9ocoBGfLS1kfgaz=sKSOSQ@mail.gmail.com> <87k2arpmvt.fsf@notabene.neil.brown.name> <CAOxFTcxaC1WOj7HeD5bRaPKV93fQZ6X-mBtHOFcQmPwWfjPxDQ@mail.gmail.com> <CAOxFTcwaDfK+gKX2d4L4DuX=pf273M8qKGGOo8G+iAVSxurHhA@mail.gmail.com>
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To: Giuseppe Bilotta <giuseppe.bilotta@gmail.com>
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On Sat, Dec 24 2016, Giuseppe Bilotta wrote:
>
>
> So the array assembles, and raid6check reports no error, but the data
> is actually inaccessible .. am I missing other aspects of the metadata
> that need to be restored?

Presumably, yes.

If you provide "mdadm --examine" from devices in both the "working" and
the "not working" case, I might be able to point to the difference.

Alternately, use "mdadm --dump" to extract the metadata, then "tar
--sparse" to combine the (sparse) metadata files into a tar-archive, and
send that.  Then I would be able to experiment myself.

NeilBrown

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