Skip to main content

Logical Volumes

Updated Mar 27, 2021 ·

Tasks​

  1. Create a 2 GiB LVM with name vgdata.
  2. In this volume group, create a 1 GiB logical volume named lvdata.
  3. Format it with xfs file system and mount it persistently on /lvdata.
  4. Reboot and check.
  5. Add another 500MiB to the created xfs file system.

Solution​

1. Create a 2 GiB LVM​

Assuming you have an additional disk or partition available (e.g., /dev/sdc), create a physical volume:

sudo pvcreate /dev/sdc

Create a volume group named vgdata using the physical volume /dev/sdc:

sudo vgcreate vgdata /dev/sdc

2. Create a 1 GiB Logical Volume​

Create a logical volume lvdata with a size of 1 GiB within the vgdata volume group:

sudo lvcreate -L 1G -n lvdata vgdata

3. Format and mount persistently​

Format the logical volume lvdata with XFS filesystem:

sudo mkfs.xfs /dev/vgdata/lvdata

Create a mount point /lvdata:

sudo mkdir /lvdata

Add an entry to /etc/fstab for persistent mounting. Edit /etc/fstab:

sudo nano /etc/fstab

Add the following line:

/dev/vgdata/lvdata  /lvdata  xfs  defaults  0  0

Mount all filesystems listed in /etc/fstab:

sudo mount -a

Check if /lvdata is mounted:

df -h /lvdata

4. Reboot and Verify​

Reboot the system:

sudo reboot

After rebooting, check if /lvdata is still mounted and accessible:

df -h /lvdata

5. Add another 500MiB​

You can extend an XFS filesystem while it's mounted:

sudo lvextend -L +500M /dev/vgdata/lvdata

Resize the XFS filesystem to utilize the additional space:

sudo xfs_growfs /dev/vgdata/lvdata