Date: Wed, 5 Apr 2006 08:21:08 +1000
From: Nathan Scott <nathans@sgi.com>
To: sen@fnal.gov
Cc: linux-xfs@oss.sgi.com
Subject: Re: XFS partition recovery
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In-Reply-To: <e90b2d6c0604040042g22d3224erf50f1f1b6f68e5b8@mail.gmail.com>; from evgeniy.sharapov@gmail.com on Tue, Apr 04, 2006 at 03:42:50AM -0400
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On Tue, Apr 04, 2006 at 03:42:50AM -0400, Evgeniy Sharapov wrote:
> I have XFS /home partition (fortunately not /). I can not mount it because
> of the error during reading the superblock.
> ...

Actually, looks like the superblock is fine, which is good - your
error message seems to be coming from a failed read in the log.

>         - zero log...
> xfs_repair: read failed: Input/output error
> senntb ~ # xfs_repair -v /dev/hda7
> Phase 1 - find and verify superblock...
> Phase 2 - using internal log
>         - zero log...
> xfs_repair: read failed: Input/output error
> senntb ~ #
>  <-------/cut------------>

So, your IDE device is returning IO errors - you're in pretty bad shape.
You have two options:
- use dd (or dd_rescue) with error-skipping-mode enabled to get what
data remains off to a working device.  Then run xfs_repair on that.
- restore from your last good backup, probably again to a different
device since the one above looks like its on its last legs.

> http://docs.cray.com/books/S-2377-22/html-S-2377-22/fixed6bhdyq9i26.html)

Yeah, from a quick look that procedure will only help you if you've
got a mountable filesystem, as you noticed.

cheers.

-- 
Nathan