Extending The Capacity Of A Logical Volume

• We can now easily extend the capacity of the logical volume.
• This can be done without unmounting it, if the file-system supports such operations.
• Reiserfs supports this since long ago. Ext3 supports it since kernel 2.6.10, provided you have e2fsprogs 1.39-1 or later.
• Here is a demonstration:

  root@simey:~/vdisks# lvm lvextend -L +100M /dev/VG_YOYO/lv_kosmo
    Extending logical volume lv_kosmo to 300.00 MB
    Logical volume lv_kosmo successfully resized
  root@simey:~/vdisks# resize_reiserfs /dev/VG_YOYO/lv_kosmo
  resize_reiserfs 3.6.19 (2003 www.namesys.com)
  
  resize_reiserfs: On-line resizing finished successfully.
  root@simey:~/vdisks# df /mnt/lv_kosmo
  Filesystem           1K-blocks Used Available Use% Mounted on
  /dev/mapper/VG_YOYO-lv_kosmo
                          307184     32840    274344  11% /mnt/lv_kosmo
  

Originally written by guy keren