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 I downloaded a newer version of the e2fsprog tools which doesn't have that fault and I have been successfully using this version for 6 months now.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 <[email protected]> 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 > [email protected] > http://lists.lustre.org/mailman/listinfo/lustre-discuss > -- Wojciech Turek Senior System Architect High Performance Computing Service University of Cambridge Email: [email protected] Tel: (+)44 1223 763517
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