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Re: xfs_repair segfaults with ag_stride option

To: Tom Crane <T.Crane@xxxxxxxxxx>
Subject: Re: xfs_repair segfaults with ag_stride option
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Sun, 05 Feb 2012 23:58:24 -0600
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <4F2F23F3.9000402@xxxxxxxxxx>
References: <4F293FCC.7010101@xxxxxxxxxx> <20120202124248.GA12107@xxxxxxxxxxxxx> <4F2F23F3.9000402@xxxxxxxxxx>
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:10.0) Gecko/20120129 Thunderbird/10.0
On 2/5/12 6:50 PM, Tom Crane wrote:
> Hi Christoph,
> Many thanks for the quick response and the patch. It was a big help.
> I was able to repair our 60TB FS in about 30 hours. I have a couple
> of questions;
> (1) The steps in the progress report seem a little strange. See the
> attachment. Is this expected?
> (2) This may be a little out of band but I have heard second hand
> reports from another sysadmin that the xfs tools which come with SLC5
> (our current Linux distro) should not be relied upon and that SLC6
> should be used. Our 60TB FS is significantly fragmented (~40%) and I
> would very much like to run xfs_fsr on it. Given that I have built
> the latest xfsprogs, is there any reason I should be afraid of
> running xfs_fsr, on the FS which comes with SLC5? Unfortunately I
> don't have ~60TB spare storage space elsewhere to backup the FS
> before defragging. What would you advise?> 
> Many thanks

Newer tools are fine to use on older filesystems, there should be no
issue there.

running fsr can cause an awful lot of IO, and a lot of file reorganization.
(meaning, they will get moved to new locations on disk, etc).

How bad is it, really?  How did you arrive at the 40% number?  Unless
you see perf problems which you know you can attribute to fragmentation,
I might not worry about it.

You can also check the fragmentation of individual files with the
xfs_bmap tool.


> Tom.
> Christoph Hellwig wrote:
>> Hi Tom,
>> On Wed, Feb 01, 2012 at 01:36:12PM +0000, Tom Crane wrote:
>>> Dear XFS Support,
>>>    I am attempting to use xfs_repair to fix a damaged FS but always
>>> get a segfault if and only if -o ag_stride is specified. I have
>>> tried ag_stride=2,8,16 & 32.  The FS is approx 60T. I can't find
>>> reports of this particular problem on the mailing list archive.
>>> Further details are;
>>> xfs_repair version 3.1.7, recently downloaded via git repository.
>>> uname -a
>>> Linux store3 2.6.18-274.17.1.el5 #1 SMP Wed Jan 11 11:10:32 CET 2012
>>> x86_64 x86_64 x86_64 GNU/Linux
>> Thanks for the detailed bug report.
>> Can you please try the attached patch?
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