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From: "Theodore Ts'o" <tytso@mit.edu>
To: Pavel Machek <pavel@ucw.cz>
Cc: kernel list <linux-kernel@vger.kernel.org>
Subject: Re: ext4: total breakdown on USB hdd, 3.0 kernel
Date: Thu, 26 Jun 2014 22:46:59 -0400	[thread overview]
Message-ID: <20140627024659.GF6826@thunk.org> (raw)
In-Reply-To: <20140626203052.GA9449@xo-6d-61-c0.localdomain>

On Thu, Jun 26, 2014 at 10:30:52PM +0200, Pavel Machek wrote:
> 
> It looks like the filesystem contains _way_ too many 0xffff's:

That sounds like it's a hardware issue.  It may be that the controller
did something insane while trying to do a write at the point when the
disk drive was disconnected (and so the drive suffered a power drop).

> I saved beggining of the filesystem using cat /dev/sdc4 | gzip -9 - > /dev/sda3, but
> then ran out of patience. So there may be something for analysis, but...

The way to snapshot just the metadata blocks for analysis is:

e2image -r /dev/hdc4 | bzip2 > ~/hdc4.e2i.bz2

But in this case, it's I doubt it will be very helpful, because
fundamentally, this appears to be a hardware issue.

       	    	       	       	       - Ted

  parent reply	other threads:[~2014-06-27  2:47 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-06-26 20:20 ext4: total breakdown on USB hdd, 3.0 kernel Pavel Machek
2014-06-26 20:30 ` Pavel Machek
2014-06-26 20:50   ` Pavel Machek
2014-06-27  2:48     ` Theodore Ts'o
2014-06-27  2:46   ` Theodore Ts'o [this message]
2014-06-29 20:25     ` Pavel Machek
2014-06-29 21:04       ` Theodore Ts'o
2014-06-30  6:46         ` Pavel Machek
2014-06-30 13:43           ` Theodore Ts'o
2014-07-04 10:23             ` ext4: media error but where? Pavel Machek
2014-07-04 12:11               ` Theodore Ts'o
2014-07-04 17:21                 ` Pavel Machek
2014-07-04 18:06                   ` Pavel Machek
2014-07-04 18:56                   ` Theodore Ts'o
2014-07-06 13:32                     ` Pavel Machek
2014-07-06 13:43                       ` Pavel Machek
2014-07-06 18:29                         ` Theodore Ts'o
2014-07-06 21:37                           ` Pavel Machek
2014-07-07  1:00                             ` Theodore Ts'o
2014-07-07 18:55                               ` Pavel Machek
2014-07-07 23:18                                 ` 3.16-rc, ext4: oopses, OOMs after hard powerdown Pavel Machek
2014-07-07 23:21                                 ` ext4: media error but where? Theodore Ts'o
2014-07-04 19:17                   ` Andreas Dilger
2014-07-04 20:33                     ` Pavel Machek
2014-07-04 22:18                       ` Andreas Dilger
2014-07-05 22:17                       ` Theodore Ts'o
2014-06-27  8:23 ` ext4: total breakdown on USB hdd, 3.0 kernel Oliver Neukum

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