linux-ext4 - Re: Issue with bad file system

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Message-ID: <20121119202453.GC30091@thunk.org>
Date:	Mon, 19 Nov 2012 15:24:53 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	Drew Reusser <dreusser@...il.com>
Cc:	Eric Sandeen <sandeen@...hat.com>,
	George Spelvin <linux@...izon.com>, linux-ext4@...r.kernel.org
Subject: Re: Issue with bad file system

On Mon, Nov 19, 2012 at 07:53:13PM +0000, Drew Reusser wrote:
> 
> mint mnt # debugfs -s 32768 -b 4096 /dev/md0
> debugfs 1.42.5 (29-Jul-2012)
> /dev/md0: Bad magic number in super-block while opening filesystem
> debugfs:
> debugfs:  ls
> ls: Filesystem not open
> debugfs:

Sorry, I didn't realize that you weren't able to find *any* backup
super blocks.  In that case, either you got really unlucky and you had
some failure which has taken out a very large number of blocks, spread
out across the file system --- or I'd have to agree with Eric, I'd
want to be really, really sure that the Raid array hadn't gotten
assembled incorrectly somehow....

							- Ted
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