linux - Problem mounting LVM in ubuntu

A few months ago I have setup a server with three hard disks. The partition mapping the disks as follows:

Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x7ca36fee

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1       12158    97659103+  83  Linux
/dev/sda2           12159       13131     7815622+  82  Linux swap / Solaris
/dev/sda3           13132      121601   871285275    5  Extended
/dev/sda5           13132      121601   871285243+  8e  Linux LVM

Disk /dev/sdc: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000160d1

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1               1      121601   976760001    5  Extended
/dev/sdc5               1      121601   976759969+  8e  Linux LVM

Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x0008d423

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1      121601   976760001    5  Extended
/dev/sdb5               1      121601   976759969+  8e  Linux LVM

As you can see I have created a Linux LVM file system. This are the information of the LVM Logical volume:

--- Logical volume ---
LV Name                /dev/gegevens/Data
VG Name                gegevens
LV UUID                XsddGq-i3wO-HjTg-Lafe-TSF3-28kr-FGYhRd
LV Write Access        read/write
LV Status              available
# open                 1
LV Size                2.63 TB
Current LE             689648
Segments               3
Allocation             inherit
Read ahead sectors     auto
- currently set to     256
Block device           252:0

Now I have the following problem the LVM file system don't mount properly.

If I open the mount point I see only a few files of the LVM disk. If I want to unmount the disk I get the following error:

umount /data/
umount: /data/: not mounted

If I want to mount the volume I get the following error:

mount -a
mount: /dev/mapper/gegevens-Data already mounted or /data busy

Wat is the problem here?

Thank you,

Ivo Trompert

Please paste the output of the following commands:

mount

as root:

lsof | grep gegevens-Data

as root again:

lsof | grep /data

Given the messages /dev/mapper/gegevens-Data already mounted or /data busy and umount: /data/: not mounted, it looks like your gegevens-Data volume is already mounted on some other directory. You can confirm that with df /dev/mapper/gegevens-Data or grep /dev/mapper/gegevens-Data /proc/mounts.

If your next question is why it is mounted: either you did it manually and forgot, or there is an entry for /dev/mapper/gegevens-Data or UUID=XsddGq-i3wO-HjTg-Lafe-TSF3-28kr-FGYhRd in /etc/fstab.

You may be interested in the command mount --move /some/where /data to change the point where a filesystem is mounted without having to unmount it.

If I open the mount point I see only a few files of the LVM disk.

Actually these files are probably files that you tried to write to the LVM disk when it wasn't mounted on /data, so move them to the LVM disk before mounting it where you want it.

An application has files open under /data, which is blocking the mount operation. Use lsof or fuser to verify.

Successfully mounted my LVM partitions using steps mentioned in link below

Mounting LVM Disk using Ubuntu livecd

See if it can help you?