Lunetikk's IT Wiki

Wikipedia - Logical Volume Manager

First you need to create a partition on a disk with type LVM
List the partitions

cat /proc/partitons

major minor  #blocks  name

  11        0    1048575 sr0
   8        0   31457280 sda
   8        1     194560 sda1
   8        2   31260672 sda2
   8       16  209715200 sdb

In this example the right one is “sdb”

fdisk /dev/sdb
n
p
enter
enter
t
1
8e
w

n = new partition, p = primary partition, enter to select default or select own range, t = change partition system id, 1 = id 1 but it might be another on your system, 8e = type LVM, w = write changes to disk

pvcreate /dev/sdb1
vgcreate data /dev/sdb1
lvcreate -l 100%FREE -n backup data
mkfs.ext3 -Ldata /dev/data/backup 
#mkfs.xfs -Ldata /dev/data/backup
vi /etc/fstab
/dev/mapper/data-backup /data                    ext3     defaults        0 0

Create a new partition for free space (example above)
Then extend the LV

pvcreate /dev/sdb1
vgextend data /dev/sdb1
lvextend -l +100%FREE /dev/data/backup     
resize2fs /dev/data/backup

lvremove /dev/data/backup
vgremove data
pvremove /dev/sdb1

rootusers.com - increase the size of lvm
turnkeylinux.org - extend lvm

Mounting the device leads to the following error

mount: special device /dev/mapper/VG01-LVbackup does not exist

Checking the LV via “lvdisplay” shows that its unavailable

LV Status              NOT available

Its deactivated

Run the following command to activate it

vgchange -ay <VGNAME>

and remount

mount <PATH>