To how extend a Logical Volume using LVM on Linux

While not a difficult process, it's not the easiest of things to do either. Logical Volume Manager (LVM) lives up to *NIX's user friendly mantra - "UNIX is user friendly, it's just picky about who it's friends are".

Because LVM is actually really powerful and flexible in managing your storage, this inherently means complexity maintaining/controlling LVM.

The basic process to extend a Logical Volume goes like this:

  • Add the additional storage to your system.
    Whether physical disks, additional virtual storage, or extending existing storage — whatever best suits your situation, needs and available resources.
  • Create a file system on the additional storage.
    You can use fdisk, gparted, or another — again, I'll leave this up to you.
    My new file system is '/dev/sda3'
  • Prepare the new partition for use by LVM
    pvcreate /dev/sda3
  • List the available Volume Groups on your system
    vgdisplay | grep 'VG Name
    My VG is named 'ubuntu-vg':
  • Extend the appropriate Volume Group (VG)
    vgextend ubuntu-vg /dev/sda3
  • Next we need to update the appropriate Logical Volume.
    First, list out your LV's:
    lvdisplay | egrep "LV (N|P)a(m|t)(e|h)"
    This will/should return both the "LV Name" and "LV Path" configuration items.
    I want to extend the 'root' LV on path '/dev/ubuntu-vg/root'
  • Now we have enough information to resize the LV
    lvresize -r -l 100%VG /dev/ubuntu-vg/root
  • Lastly, we need to resize the filesystem to match the LV
    resize2fs /dev/mapper/ubuntu--vg-root

Anyway, that's a very quick way to get it done.
It helped me, I hope it helps you, too.

Paul Macdonnell

Things do and stuff gets