Re: RAID5 failure; possible to repair?

To: Ramon Hofer <ramonhofer@bluewin.ch>
Cc: debian-user@lists.debian.org
Subject: Re: RAID5 failure; possible to repair?
From: Daniel Koch <koch.daniel.89@googlemail.com>
Date: Wed, 18 Apr 2012 15:03:04 +0200
Message-id: <[🔎] CAHSCfnznkCb8xYqEwECJPvP6L+L4fmYoKwKorhRXvP9svVpxTg@mail.gmail.com>
In-reply-to: <[🔎] jmm3pt$33b$1@dough.gmane.org>
References: <[🔎] jmm3pt$33b$1@dough.gmane.org>

Zero all the superblocks on all the disks. (mdadm --zero-superblock /dev/sd{b..d})
Recreate the array with the "--assume-clean" option. (mdadm --create --verbose /dev/md0 --auto=yes --assume-clean --level=5 --raid-devices=3 /dev/sdb /dev/sdc /dev/sdd)
Mark it possibly dirty with: "mdadm --assemble /dev/md0 --update=resync"
Let it resync
Mount it and see if it is restored

If this is not working your raid is lost.

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