From mboxrd@z Thu Jan  1 00:00:00 1970
From: NeilBrown <neilb@suse.de>
Subject: Re: md raid6 not working
Date: Tue, 21 Aug 2012 08:34:02 +1000
Message-ID: <20120821083402.5e5b2fcf@notabene.brown>
References: <CC5802CB.287BB%michael.vanhorn@wright.edu>
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To: "Vanhorn, Mike" <michael.vanhorn@wright.edu>
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On Mon, 20 Aug 2012 19:06:17 +0000 "Vanhorn, Mike"
<michael.vanhorn@wright.edu> wrote:

>=20
> I have/had an 8-disk md raid 6, /dev/md0. At some point over the weekend,
> two of the disks suddently became marked as "spare" and the other has
> disappeared completely (at least as far as mdadm is concerned).
>=20
> All eight disks seem to be just fine, so I think the data is okay, and if
> I could just convince it to start the array with all 8 disks, I actually
> think everything would be fine. However, everything I've tried has come to
> nothing, and now I think I am stuck.
>=20
> Is there some way to just "force" is to change the two spare disks from
> "spare" to "active", and then let it go?
>=20
> Here's what I think are relevant details:
>=20
> The RAID is/was composed of /dev/sd[bcdefghi]1.
>=20
> /proc/mdstat says:
>=20
> # cat /proc/mdstat
> Personalities : [raid6]
> md0 : inactive sdc1[1] sdd1[10] sdi1[8] sdg1[5] sdf1[4] sde1[3] sdh1[2]
>       13674583552 blocks
>       =20
> unused devices: <none>
> #=20
>=20
> So, here, sdb is the only one missing. However, if I try to start the arr=
ay
>=20
> # mdadm --assemble /dev/md0
> mdadm: /dev/sdi1 has no superblock - assembly aborted
> #

What is the result of:

  mdadm -S /dev/md0
  mdadm -Avvv /dev/md0
??

NeilBrown



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