O primeiro passo é identificar o HD:

# fdisk -l /dev/hda

Disk /dev/hda: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot  Start    End    Blocks   Id  System
/dev/hda1   *         1      13      104391  83  Linux
/dev/hda2 14       19457   156183930   8e  Linux LVM

# mount /dev/hda2 /tmp/mnt
mount: /dev/hda2 already mounted or /tmp/mnt busy
First, let’s determine the volume group containing the physical volume /dev/hda2.

Verifique que o comando acima retornou erro informando para determinar primeiro o grupo físico do volume.

Para isso precisamos identificar o grupo com o comando:

# pvs

PV         VG         Fmt  Attr PSize   PFree
/dev/hda2 VolGroup01 lvm2 a-   148.94G 32.00M
/dev/hdb2  VolGroup00 lvm2 a-   114.94G 96.00M
Next, let’s list the logical volumes in VolGroup01.

Foram identificados dois volumes, VolGroup00 e o VolGroup01.

Bom, agora com o comando abaixo vamos identificar como que esses grupos foram montados "fisicamente" pelo sistema.

# lvdisplay /dev/VolGroup00

— Logical volume —
LV Name                /dev/VolGroup01/LogVol00
VG Name                VolGroup01
LV UUID                zOQogm-G8I7-a4WC-T7KI-AhWe-Ex3Y-JVzFcR
LV Write Access        read/write
LV Status              available
# open                 0
LV Size                146.97 GB
Current LE             4703
Segments               1
Allocation             inherit
Read ahead sectors     0
Block device           253:2

# lvdisplay /dev/VolGroup01

— Logical volume —
LV Name                /dev/VolGroup01/LogVol01
VG Name                VolGroup01
LV UUID                araUBI-4eer-uh5L-Dvnr-3bI6-4gYg-APgYy2
LV Write Access        read/write
LV Status              available
# open                 0
LV Size                1.94 GB
Current LE             62
Segments               1
Allocation             inherit
Read ahead sectors     0
Block device           253:3
The logical volume I would like to “mount” (in purely 
the computing-related sense) is /dev/VolGroup01/LogVol00. 
The other logical volume is a swap partition.

Agora basta escolher qual deles montar e executar o comando abaixo:

# mount /dev/VolGroup01/LogVol00 /tmp/mnt

Bom, era isso. Abraços...