Attach Disk

First of all attach a disk to the Linux Box by following Attach Disk to Live Linux

Create new partition

  • As root user run fdisk on new disk, this tutorial will use /dev/sdd as example. Output will look like
    $ fdisk /dev/sdd
    Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
    Building a new DOS disklabel with disk identifier 0x925579ba.
    Changes will remain in memory only, until you decide to write them.
    After that, of course, the previous content won't be recoverable.
    Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
    WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
             switch off the mode (command 'c') and change display units to
             sectors (command 'u').
    
    Command (m for help):
    
  • Create a new partition by typing letter ‘n‘ and hit enter, to create a primary partition type ‘p‘, followed by partition number e.g. ‘1‘ and then accept default cylinder numbers by hitting enter to use the maximum space on the disk,
    Output would like like

    Command (m for help): n
    Command action
       e   extended
       p   primary partition (1-4)
    p
    Partition number (1-4): 1
    First cylinder (1-2088, default 1):
    Using default value 1
    Last cylinder, +cylinders or +size{K,M,G} (1-2088, default 2088):
    Using default value 2088
    
    Command (m for help):
    
  • Change the type of the partition to Linux LVM by hitting ‘t’ followed by ‘8e’
    Command (m for help): t
    Selected partition 1
    Hex code (type L to list codes): 8e
    Changed system type of partition 1 to 8e (Linux LVM)
    
    Command (m for help):
  • to see the result hit ‘p’, please note the device path in the output, in this example “/dev/sdd1″
    Command (m for help): p
    Disk /dev/sdd: 17.2 GB, 17179869184 bytes
    255 heads, 63 sectors/track, 2088 cylinders
    Units = cylinders of 16065 * 512 = 8225280 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x925579ba
       Device Boot      Start         End      Blocks   Id  System
    /dev/sdd1               1        2088    16771828+  8e  Linux LVM
    
    Command (m for help):
  • to write changes and exit hit ‘w’
    Command (m for help): w
    The partition table has been altered!
    
    Calling ioctl() to re-read partition table.
    Syncing disks.
  • use pvcreate to setup the newly created partition
    pvcreate /dev/sdd1

Extend existing volume group on to new partition

  • Run vgdisplay to get list of volume groups
    $ vgdisplay
      --- Volume group ---
      VG Name               ubuntu-template
      System ID
      Format                lvm2
      Metadata Areas        1
      Metadata Sequence No  3
      VG Access             read/write
      VG Status             resizable
      MAX LV                0
      Cur LV                2
      Open LV               2
      Max PV                0
      Cur PV                1
      Act PV                1
      VG Size               19.76 GiB
      PE Size               4.00 MiB
      Total PE              5058
      Alloc PE / Size       5054 / 19.74 GiB
      Free  PE / Size       4 / 16.00 MiB
      VG UUID               RIgBdX-r2aN-s0Dn-kkkh-ZkVr-rHDM-AycDtH
    
      --- Volume group ---
      VG Name               ubuntuserver
      System ID
      Format                lvm2
      Metadata Areas        3
      Metadata Sequence No  6
      VG Access             read/write
      VG Status             resizable
      MAX LV                0
      Cur LV                2
      Open LV               2
      Max PV                0
      Cur PV                3
      Act PV                3
      VG Size               43.82 GiB
      PE Size               4.00 MiB
      Total PE              11218
      Alloc PE / Size       5537 / 21.63 GiB
      Free  PE / Size       5681 / 22.19 GiB
      VG UUID               ZoXbMV-LtZL-TRT1-MIFi-04xr-CFB3-rYTKxs
    
  • in above output we will be extending “ubuntuserver” volume group by running
    vgextended ubuntuserver /dev/sdd1

Extend existing logical volume onto new space

  • Get the file path for the logical volume
    $ ls -la /dev/ubuntuserver
    total 0
    drwxr-xr-x  2 root root   80 2012-10-11 10:57 .
    drwxr-xr-x 15 root root 3940 2012-10-11 13:00 ..
    lrwxrwxrwx  1 root root   27 2012-10-11 10:59 root -> ../mapper/ubuntuserver-root
    lrwxrwxrwx  1 root root   29 2012-10-09 12:51 swap_1 -> ../mapper/ubuntuserver-swap_1
  • use lvextend
    • to use all of the new space
      lvextend /dev/ubuntuserver/root /dev/sdd1
    • to increase by by 20GB, provided that /dev/sdd1 has the free space available
      lvextend -L +20G /dev/ubuntuserver/root /dev/sdd1

Extend Filesystem

The command to use depends on the file system that is currently in use.

  • For ext3/4
    ext2online /dev/ubuntuserver/root

    OR

    resize2fs /dev/ubuntuserver/root
  • For reiserfs
    resize_reiserfs /dev/ubuntuserver/root

Finally, check disk space to see the expanded disk space

df -h
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