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Re: How to fix bad superblock or xfs_repair: error - read only 0 of 512

To: Christian Kildau <lists@xxxxxxxxxxxxx>
Subject: Re: How to fix bad superblock or xfs_repair: error - read only 0 of 512 bytes
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Tue, 24 Jan 2012 09:50:25 -0600
Cc: Roger Willcocks <roger@xxxxxxxxxxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <4D396236-D516-4948-8F43-1AED88539BC4@xxxxxxxxxxxxx>
References: <CALx8gnT9tdPRGfVR0puoSVYz_MDDs4FtWtodST5x29GDnL3A_w@xxxxxxxxxxxxxx> <20120123043117.GH15102@dastard> <92CDAC52-1BA1-43A8-8470-0E2DCD916610@xxxxxxxxxxxxx> <4F1E3BD0.7080604@xxxxxxxxxxx> <B1F1FDAB-0D48-48FE-8FFC-F0567780E052@xxxxxxxxxxxxx> <1327414341.24535.582.camel@xxxxxxxxxxxxxxxxxxxxxxxx> <4D396236-D516-4948-8F43-1AED88539BC4@xxxxxxxxxxxxx>
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On 1/24/12 9:46 AM, Christian Kildau wrote:
> 
> On Jan 24, 2012, at 3:12 PM, Roger Willcocks wrote:
> 
>>
>> On Tue, 2012-01-24 at 11:13 +0100, Christian Kildau wrote:
>>> Top posting... sorry.
>>>
>>> I have now found dozens of other users with a similar issue! e.g.
>>> http://www.linuxquestions.org/questions/linux-general-1/cannot-mount-hard-disk-block-count-exceeds-size-of-device-bad-partition-table-880149/
>>>
>>> To make it short all of these users were running ext4 and a fs resize to 
>>> the new geometry fixed their problems! Sadly XFS doesn't support shrinking 
>>> the fs(?).
>>>
>>
>> It seems fairly clear that your drive or the bios is lying about its
>> capacity. The filesystem occupies the entire disk, but the disk has
>> become 'smaller'. A quick web search suggests a 'hidden protected area'
>> - the two block counts in this link line up with the before and after
>> sizes you're seeing:
>>
>> http://lime-technology.com/forum/index.php?topic=13440.0;wap2
>>
>> It would be instructive to see what 'hdparm -N /dev/sdd' says on your
>> system. And a dmesg log would be handy too.
>>
>> Note that this is /not/ a problem with xfs. The right fix is to tell the
>> drive to report its actual capacity, not to shrink the filesystem.
> 
> I do understand that is definitely not an XFS issue, but some strange issue 
> with ubuntu or their kernel patches...
> 
> I got my data back by dumping the entire hdd (it was partitionless 
> nevertheless) to a bigger 2TB hdd.
> XFS mounts without any problems and I can restore my data.
> 
> Thanks all for your help!

It's likely still missing the end of the filesystem, though.

Can you run the hdparm command Roger suggested on your original hard drive, 
please?

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