Step 1: Confirm Disk Partitions in Distribution.
You can do this by typing
df –h
Step 2: Format data disk as LVM partition
First become root by typing
sudo su –
Format disk partition by typing
fdisk /dev/xvda
Note: Device name differs for different distributions check by listing them with fdisk –l it is xvda in our case
To list options available
Command (m for help): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
List LVM partitions present
Command (m for help): p
Disk /dev/xvda: 1099.5 GB, 1099511627776 bytes
255 heads, 63 sectors/track, 133674 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: 0x000403ec
Device Boot Start End Blocks Id System
/dev/xvda1 * 1 64 512000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/xvda2 64 2611 20458496 8e Linux LVM
To add the data disk to partition table
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 3
First cylinder (2611-133674, default 2611):
Using default value 2611
Last cylinder, +cylinders or +size{K,M,G} (2611-133674, default 133674):
Using default value 133674
Confirm that this has been done by typing p again
Command (m for help): p
To convert its system type to LVM
Command (m for help): t
Partition number (1-4): 3
Hex code (type L to list codes): 8e
Changed system type of partition 3 to 8e (Linux LVM)
Confirm the changes
Command (m for help): p
Write changes to disk
Command (m for help): w
Reboot the VM at this point to save changes before going to the next step.
Step 3: Create Physical Volume
Check physical volumes present in distribution by typing
lsblk
Resize Volume Group
pvcreate /dev/xvda3
Confirm that the volume has been converted successfully
pvdisplay
Step 4: Add the New Physical Volume to Volume Group
Check volume group already present
vgdisplay
Add volume to volume group
vgextend /dev/name-of-volume-group /dev/xvda3
Confirm this using first command
Step 5: Resize root logical volume to occupy all space
Confirm name of root logical volume using lsblk command, some distributions name it as lv_root, we used root in this guide.
Resize root
lvextend -l 100%FREE /dev/name-of-volume-group/root
Confirm using
lvdisplay
You can replace the 100%FREE command with preferred space in MB, for example, to add 256 MB replace it with +256M
Step 6: Copy changes to filesystem
df -h still shows 19G for the root volume; to make the filesystem report the actual size use
For ext4 filesystem
resize2fs /dev/name-of-volume-group/root
For xfs filesystem
xfs_growfs /dev/name-of-volume-group/root
