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

[Erik Froese]

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.
scratch-OST0018 contains a file system with errors, check forced.
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure

Pass 3: Checking directory connectivity

Pass 4: Checking reference counts

Pass 5: Checking group summary information

Free blocks count wrong (895594326, counted=895594327).

Fix? no

scratch-OST0018: 3363862/244015104 files (1.2% non-contiguous),
80436992/976031318 blocks
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