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Logical Volume Management (LVM) Setup

Provision a new logical volume from an additional disk (vdb) and mount it to /mnt/data:

1. Identify Additional Disk​

Verify the presence of the additional 20GB block device:

check block devices:

lsblk

output:

vda     252:0    0   50G  0 disk 
├─vda1  252:1    0 49.9G  0 part /
├─vda14 252:14   0    4M  0 part 
└─vda15 252:15   0  106M  0 part /boot/efi
vdb     252:16   0   20G  0 disk

2. Initialize Physical & Volume Group​

Prepare the raw device for LVM:

initialize physical volume:

sudo pvcreate /dev/vdb

create volume group:

sudo vgcreate vg_data /dev/vdb

Verification (PV & VG)​

Verify that the Physical Volume and Volume Group were created correctly:

check physical volume:

sudo pvdisplay /dev/vdb

pvdisplay

check volume group:

sudo vgdisplay vg_data

vgdisplay

3. Provision Logical Volume​

Create and format the logical volume to utilize the full available capacity:

create logical volume:

sudo lvcreate -l 100%FREE -n lv_data vg_data

Verification (LV)​

Verify the Logical Volume properties:

check logical volume:

sudo lvdisplay /dev/vg_data/lv_data

lvdisplay

format partition (ext4):

sudo mkfs.ext4 /dev/vg_data/lv_data

4. Mounting & Persistence​

To use the new volume and ensure it remains available after a system reboot, you must mount it and register it in the filesystem table (/etc/fstab).

A. Manual Mount​

Create the mount point and perform the initial attachment:

create mount point & mount:

sudo mkdir -p /mnt/data
sudo mount /dev/vg_data/lv_data /mnt/data

B. Configure Persistence (fstab)​

Retrieve the Unique Identifier (UUID) and add it to the system configuration:

get block device id:

sudo blkid /dev/vg_data/lv_data

output:

/dev/vg_data/lv_data: UUID="a0649047-33ad-40aa-8e2a-dd0f6cea2358" BLOCK_SIZE="4096" TYPE="ext4"

append to fstab (use your actual UUID):

echo 'UUID="a0649047-33ad-40aa-8e2a-dd0f6cea2358" /mnt/data ext4 defaults 0 2' | sudo tee -a /etc/fstab

verify fstab entry:

sudo cat /etc/fstab

cat-fstab

verify fstab validity:

sudo mount -a

presistent