This guide describes how to configure two new, unpartitioned disks (example: /dev/sdb and /dev/sdc) using LVM so they form a single storage pool (Volume Group) that spans both disks.
From that VG, we will create two logical volumes, format them with XFS, and mount them persistently.

1. Identify the New Disks

lsblk

Verify /dev/sdb and /dev/sdc are unused:

sudo fdisk -l /dev/sdb
sudo fdisk -l /dev/sdc

2. Create LVM Partitions on Both Disks

Repeat this process for both disks: /dev/sdb and /dev/sdc.

For each disk:

sudo fdisk /dev/sdb

Inside fdisk:

n       # new partition
p       # primary
1       # partition number
<enter> # default start
<enter> # default end (use full disk)
t       # change type
8e      # Linux LVM
w       # write and exit

Repeat for /dev/sdc:

sudo fdisk /dev/sdc

Afterward, you should have:

• /dev/sdb1
• /dev/sdc1
  Both with partition type 8e (Linux LVM).

3. Create Physical Volumes (PVs)

sudo pvcreate /dev/sdb1
sudo pvcreate /dev/sdc1

Verify:

sudo pvs

4. Create a Volume Group (VG) that Spans Both Disks

Example VG name: vg_storage

sudo vgcreate vg_storage /dev/sdb1 /dev/sdc1

Verify:

sudo vgs

The VG now spans two physical disks.

5. Create Logical Volumes (LVs)

Here we will create two logical volumes inside the shared Volume Group.

Option A — Define specific sizes

Example:

sudo lvcreate -L 100G -n lv_data1 vg_storage
sudo lvcreate -L 200G -n lv_data2 vg_storage

Option B — Use all remaining space for LV2:

sudo lvcreate -L 100G -n lv_data1 vg_storage
sudo lvcreate -l 100%FREE -n lv_data2 vg_storage

Verify:

sudo lvs

Logical volumes created:

• /dev/vg_storage/lv_data1
• /dev/vg_storage/lv_data2

6. Format Logical Volumes With XFS

Install XFS tools if required:

sudo yum install xfsprogs       # RHEL/CentOS/Rocky
sudo apt install xfsprogs       # Ubuntu/Debian

Format:

sudo mkfs.xfs /dev/vg_storage/lv_data1
sudo mkfs.xfs /dev/vg_storage/lv_data2

7. Create Mount Points

sudo mkdir -p /mnt/data1
sudo mkdir -p /mnt/data2

8. Mount the Logical Volumes

sudo mount /dev/vg_storage/lv_data1 /mnt/data1
sudo mount /dev/vg_storage/lv_data2 /mnt/data2

Verify:

df -h | grep data

9. Configure Persistent Mounting via /etc/fstab

9.1 Get UUIDs

sudo blkid /dev/vg_storage/lv_data1
sudo blkid /dev/vg_storage/lv_data2

9.2 Add entries to /etc/fstab

sudo nano /etc/fstab

Add lines:

UUID=<uuid1>   /mnt/data1   xfs   defaults   0 0
UUID=<uuid2>   /mnt/data2   xfs   defaults   0 0

Test:

sudo mount -a

If no errors appear, configuration is correct.

10. Reboot and Verify

sudo reboot

Then:

df -h | grep data

Both logical volumes should mount automatically.

Final Architecture Overview

Disk 1 → /dev/sdb1 (LVM PV)
Disk 2 → /dev/sdc1 (LVM PV)
      \              /
       \            /
        \__________/
         Volume Group (vg_storage)
             ├── Logical Volume: lv_data1 → XFS → /mnt/data1
             └── Logical Volume: lv_data2 → XFS → /mnt/data2

The VG spans both disks, allowing LV sizes to grow beyond a single disk.