mount lvm

[thufir]

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:~#
    root at dur:~# mount /dev/sda2 /media/sda2
    mount: you must specify the filesystem type
    root at dur:~#
     
     
    root at dur:~#
    root at dur:~# ls -al /dev/mapper
    total 0
    drwxr-xr-x  2 root root     100 Dec 25 17:45 .
    drwxr-xr-x 15 root root    4460 Dec 25 19:45 ..
    crw-------  1 root root 10, 236 Dec 25 17:45 control
    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:~#
     
     
    root at dur:~#
    root at dur:~# fdisk -l
     
    Disk /dev/sda: 80.0 GB, 80026361856 bytes
    255 heads, 63 sectors/track, 9729 cylinders, total 156301488 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x000d2c34
     
       Device Boot      Start         End      Blocks   Id  System
    /dev/sda1   *        2048   152176639    76087296   83  Linux
    /dev/sda2       152178686   156301311     2061313    5  Extended
    /dev/sda5       152178688   156301311     2061312   82  Linux swap / 
Solaris
     
    Disk /dev/sdb: 30.8 GB, 30750031872 bytes
    255 heads, 63 sectors/track, 3738 cylinders, total 60058656 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x0000f2be
     
       Device Boot      Start         End      Blocks   Id  System
    /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
    255 heads, 63 sectors/track, 3449 cylinders, total 55418880 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x00000000
     
    Disk /dev/mapper/dur-root doesn't contain a valid partition table
     
    Disk /dev/mapper/dur-swap_1: 2113 MB, 2113929216 bytes
    255 heads, 63 sectors/track, 257 cylinders, total 4128768 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x00000000
     
    Disk /dev/mapper/dur-swap_1 doesn't contain a valid partition table
    root at dur:~#
    root at dur:~# lvdisplay
      --- Logical volume ---
      LV Name                /dev/dur/root
      VG Name                dur
      LV UUID                bqK8yp-VgIg-UZdS-nsXO-SFka-NWkX-odW0wa
      LV Write Access        read/write
      LV Status              available
      # open                 0
      LV Size                26.43 GiB
      Current LE             6765
      Segments               1
      Allocation             inherit
      Read ahead sectors     auto
      - currently set to     256
      Block device           252:0
       
      --- Logical volume ---
      LV Name                /dev/dur/swap_1
      VG Name                dur
      LV UUID                dBpQrP-U3kp-c4jU-HaSG-BVVb-RfCe-4QI91H
      LV Write Access        read/write
      LV Status              available
      # open                 0
      LV Size                1.97 GiB
      Current LE             504
      Segments               1
      Allocation             inherit
      Read ahead sectors     auto
      - currently set to     256
      Block device           252:1
       
    root at dur:~#
    root at dur:~# mount
    /dev/sda1 on / type ext4 (rw,errors=remount-ro)
    proc on /proc type proc (rw,noexec,nosuid,nodev)
    sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
    none on /sys/fs/fuse/connections type fusectl (rw)
    none on /sys/kernel/debug type debugfs (rw)
    none on /sys/kernel/security type securityfs (rw)
    udev on /dev type devtmpfs (rw,mode=0755)
    devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
    tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)
    none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880)
    none on /run/shm type tmpfs (rw,nosuid,nodev)
    gvfs-fuse-daemon on /home/thufir/.gvfs type fuse.gvfs-fuse-daemon 
(rw,nosuid,nodev,user=thufir)
    root at dur:~#
    root at dur:~#




thanks,

Thufir