[Lustre-discuss] e2fsck issue

[Wojciech Turek]

Hi Christos,

As far as I remember the mmp implementation in the default Lustre e2fsprog
has a bug where you can not access filesystem in readonly mode as long as
the filesystem is mounted. I downloaded a newer version of the e2fsprog
tools which doesn't have that fault and I have been successfully using this
version for 6 months now.

e2fsprogs-1.41.12.2.ora1-0redhat.x86_64
e2fsprogs-devel-1.41.12.2.ora1-0redhat.x86_64

So if you upgrade your e2fsprogs to newer version you should not have a
problem to run fsck with -n

Other option you have is to temporarily disable the MMP protection but I am
not sure if you can do that while device is mounted.

Best regards,

Wojciech


On 13 April 2011 09:29, Christos Theodosiou <ctheodos at grid.auth.gr> wrote:

> Hi all,
>
> I am trying to perform a file-system check on a mounted lustre file-system.
>
> The e2fsck fails with the following message:
>
>  > e2fsck -n -v --mdsdb /tmp/mdsdb /dev/msavg/lv001
> e2fsck 1.41.10.sun2 (24-Feb-2010)
> device /dev/mapper/msavg-lv001 mounted by lustre per
> /proc/fs/lustre/mds/lustrefs-MDT0000/mntdev
> Warning!  /dev/msavg/lv001 is mounted.
> e2fsck: MMP: device currently active while trying to open /dev/msavg/lv001
>
> The superblock could not be read or does not describe a correct ext2
> filesystem.  If the device is valid and it really contains an ext2
> filesystem (and not swap or ufs or something else), then the superblock
> is corrupt, and you might try running e2fsck with an alternate superblock:
>     e2fsck -b 32744 <device>
>
> I tried setting -b argument but the message persists.
>
> Do you have any suggestions on how to proceed.
>
> Best regards
> Christos
>
> --
> Christos Theodosiou
> Scientific Computational Center
> Aristotle University
> 54 124 Thessaloniki, Greece
> Tel: +30 2310 99 8988
> Fax: +30 2310 99 4309
> http://www.grid.auth.gr
>
> _______________________________________________
> Lustre-discuss mailing list
> Lustre-discuss at lists.lustre.org
> http://lists.lustre.org/mailman/listinfo/lustre-discuss
>



-- 
Wojciech Turek

Senior System Architect

High Performance Computing Service
University of Cambridge
Email: wjt27 at cam.ac.uk
Tel: (+)44 1223 763517
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