How to Mount a Logical Volume

I am currently running Fedora 12, and on /dev/sda3 I have two logical volumes: one for swap and one for the root partition.  If I try to mount the physical volume, /dev/sda3, then I get the following error:

[brad@localhost ~]$ mount /dev/sda3 /mnt/disk
mount: unknown filesystem type ‘LVM2_member’

What I actually want to do is ‘mount the root filesystem on /dev/sda3’.  First, use the command pvs to get information about the physical volumes on the computer.

[brad@localhost ~]$ sudo pvs
PV         VG       Fmt  Attr PSize   PFree
/dev/sda3  VolGroup lvm2 a-   200.24G    0

So the volume group VolGroup is on the physical volume /dev/sda3.    Then use the lvdisplay command to list the logical volumes in the volume group VolGroup.

[brad@localhost ~]$ sudo lvdisplay /dev/VolGroup
— Logical volume —
LV Name                /dev/VolGroup/lv_root
VG Name                VolGroup
LV UUID                j7d1k3-xELA-VQ7x-90T7-QwX1-62mc-0HgVaF
LV Write Access        read/write
LV Status              available
# open                 1
LV Size                196.30 GB
Current LE             50253
Segments               1
Allocation             inherit
Read ahead sectors     auto
– currently set to     256
Block device           253:0

— Logical volume —
LV Name                /dev/VolGroup/lv_swap
VG Name                VolGroup
LV UUID                G0AW8c-Pg1n-KFrL-koAj-pdhi-XjkK-LEGinf
LV Write Access        read/write
LV Status              available
# open                 1
LV Size                3.94 GB
Current LE             1008
Segments               1
Allocation             inherit
Read ahead sectors     auto
– currently set to     256
Block device           253:1

From this output I know that the root filesystem is in the logical volume /dev/VolGroup/lv_root.  To mount this volume, I would run the following command:

[brad@localhost ~]$ mount /dev/VolGroup/lv_root /mnt/disk

You will have to create the folder /mnt/disk.

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