mount lvm

[Tom H]

On Wed, Dec 26, 2012 at 1:08 AM, thufir <hawat.thufir at gmail.com> wrote:
>
>
> In trying to mount an LVM I was given this command on IRC:
>
> /dev/mapper/dur-root /media/sda2
>
> but why wasn't it:
>
> /dev/mapper/sda2 /media/sda2         ?
>
>
>     root at dur:~# mount /dev/sda2 /media/sda2
>     mount: you must specify the filesystem type
>
>
>     root at dur:~# ls -al /dev/mapper
>     lrwxrwxrwx  1 root root       7 Dec 25 17:45 dur-root -> ../dm-0
>     lrwxrwxrwx  1 root root       7 Dec 25 17:45 dur-swap_1 -> ../dm-1
>
>
>     root at dur:~# fdisk -l
>
>     Disk /dev/sda: 80.0 GB, 80026361856 bytes
>     /dev/sda1   *        2048   152176639    76087296   83  Linux
>     /dev/sda2       152178686   156301311     2061313    5  Extended
>     /dev/sda5       152178688   156301311     2061312   82  Linux swap
>
>     Disk /dev/sdb: 30.8 GB, 30750031872 bytes
>     /dev/sdb1            2048      499711      248832   83  Linux
>     /dev/sdb2          501758    60057599    29777921    5  Extended
>     /dev/sdb5          501760    60057599    29777920   8e  Linux LVM
>
>     Disk /dev/mapper/dur-root: 28.4 GB, 28374466560 bytes
>     Disk /dev/mapper/dur-root doesn't contain a valid partition table
>
>     Disk /dev/mapper/dur-swap_1: 2113 MB, 2113929216 bytes
>     Disk /dev/mapper/dur-swap_1 doesn't contain a valid partition table
>
>
>     root at dur:~# lvdisplay
>       --- Logical volume ---
>       LV Name                /dev/dur/root
>       VG Name                dur
>       LV Size                26.43 GiB
>
>       --- Logical volume ---
>       LV Name                /dev/dur/swap_1
>       VG Name                dur
>       LV Size                1.97 GiB
>
>
>     root at dur:~# mount
>     /dev/sda1 on / type ext4 (rw,errors=remount-ro)


"mount /dev/mapper/sda2 <mount-point>" won't work because "/dev/sda2"
is an extended partition and "/dev/mapper/sda2" doesn't exist (also,
FYI, your LVM volumes are on "/dev/sdb5").

You should be able to mount your non-swap LVM volume with any of
mount /dev/dur/root <mount-point>
mount /dev/mapper/dur-root <mount-point>
mount /dev/dm-0 <mount-point>