[Lustre-discuss] Lustre claims OST is mounted when it is not

[Bernd Schubert]

Hello Erik,

unfortunately, there is no solution than to reboot. For some unknown (yet to 
debug reasons) variable references could not given up, so in order to prevent 
NULL point dereferences, Lustre did not umount.


Cheers,
Bernd

On Friday 15 January 2010, Erik Froese wrote:
> Thanks Bernd.
> 
> From the bug reports it looks like the OST is actually still mounted by
> lustre, unbeknownst to Linux and VFS.
> Is there a mechanism to unmount it or do I need to reboot?
> 
> Erik
> 
> On Fri, Jan 15, 2010 at 3:28 PM, Bernd Schubert
> 
> <bs_lists at aakef.fastmail.fm>wrote:
> > On Friday 15 January 2010, Erik Froese wrote:
> > > We had an OSS lockup and had to be reset. Heartbeat failed to mount one
> >
> > of
> >
> > > the OSTs and unmounted all of its local OSTs.
> > >
> > > I'm trying to run mount on one of the OSTs (ost08) but it claims its
> > >  mounted when it is not.
> > >
> > > I have other OSTs mounted so I can't remove the driver right now. Any
> > >  ideas?
> > >
> > > Redhat 5.3
> > >
> > > [root at oss-0-0 ~]# uname -a
> > > Linux oss-0-0.local 2.6.18-128.7.1.el5_lustre.1.8.1.1 #1 SMP Tue Oct 6
> > > 05:48:57 MDT 2009 x86_64 x86_64 x86_64 GNU/Linux
> > >
> > > [root at oss-0-0 ~]# mount | grep ost
> > > /dev/dsk/ost12 on /mnt/scratch/ost12 type lustre (rw)
> > > /dev/dsk/ost16 on /mnt/scratch/ost16 type lustre (rw)
> > > /dev/dsk/ost20 on /mnt/scratch/ost20 type lustre (rw)
> > > /dev/dsk/ost00 on /mnt/scratch/ost00 type lustre (rw)
> > > /dev/dsk/ost04 on /mnt/scratch/ost04 type lustre (rw)
> > > /dev/dsk/ost110 on /mnt/scratch/ost110 type lustre (rw)
> > >
> > > [root at oss-0-0 ~]# umount -f /mnt/scratch/ost08
> > > umount2: Invalid argument
> > > umount: /mnt/scratch/ost08: not mounted
> > >
> > > [root at oss-0-0 ~]# e2fsck -n /dev/dsk/ost08 | tee
> > > /state/partition1/e2fsck-n.ost08_`date '+%m.%d.%y-%H:%M:%S'`.log
> > > e2fsck 1.41.6.sun1 (30-May-2009)
> > > device /dev/sdj mounted by lustre per
> > > /proc/fs/lustre/obdfilter/scratch-OST0018/mntdev
> > > Warning!  /dev/dsk/ost08 is mounted.
> > > Warning: skipping journal recovery because doing a read-only filesystem
> > > check.
> >
> > see here:
> >
> > https://bugzilla.lustre.org/show_bug.cgi?id=19566
> > https://bugzilla.lustre.org/show_bug.cgi?id=21359
> >
> > --
> > Bernd Schubert
> > DataDirect Networks
> 


-- 
Bernd Schubert
DataDirect Networks