Disk Management with LVM

Intermediate15 min

Manage logical volumes, extend filesystems, and monitor disk health using LVM and standard disk utilities.

Prerequisites

-Linux shell access
-Root or sudo access
-LVM installed

Steps

View physical volumes

List all physical volumes in the LVM system.

$ sudo pvs

View volume groups and free space

Check volume groups and how much space is available for new logical volumes.

$ sudo vgs

List logical volumes with details

View all logical volumes and their sizes.

$ sudo lvs -o lv_name,vg_name,lv_size,lv_attr

Extend a logical volume and resize the filesystem

Add more space to an existing logical volume and grow the filesystem to use it.

$ sudo lvextend -L +10G /dev/vg0/lv_data && sudo resize2fs /dev/vg0/lv_data

Use -l +100%FREE to use all remaining free space in the volume group.

For XFS filesystems, use 'xfs_growfs /mount/point' instead of resize2fs.

Check filesystem health

Verify filesystem integrity. Must be run on unmounted or read-only filesystems.

$ sudo fsck -n /dev/vg0/lv_data

Never run fsck on a mounted read-write filesystem. Use -n for a read-only check.

Full Script

full-script.sh

#!/bin/bash
# Disk Management Overview
set -euo pipefail

echo "=== Disk Usage ==="
df -h | grep -v tmpfs

echo ""
echo "=== Block Devices ==="
lsblk -f

echo ""
echo "=== LVM Status ==="
echo "--- Physical Volumes ---"
sudo pvs 2>/dev/null || echo "No PVs or LVM not installed"

echo ""
echo "--- Volume Groups ---"
sudo vgs 2>/dev/null || echo "No VGs"

echo ""
echo "--- Logical Volumes ---"
sudo lvs 2>/dev/null || echo "No LVs"

echo ""
echo "=== Disk Health ==="
for disk in $(lsblk -dn -o NAME | grep -E '^sd|^nvme'); do
  echo "--- /dev/$disk ---"
  sudo smartctl -H "/dev/$disk" 2>/dev/null | grep -i 'health\|result' || echo "SMART not available"
done

FAQ

Discussion

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#!/bin/bash # Disk Management Overview set -euo pipefail echo "=== Disk Usage ===" df -h | grep -v tmpfs echo "" echo "=== Block Devices ===" lsblk -f echo "" echo "=== LVM Status ===" echo "--- Physical Volumes ---" sudo pvs 2>/dev/null || echo "No PVs or LVM not installed" echo "" echo "--- Volume Groups ---" sudo vgs 2>/dev/null || echo "No VGs" echo "" echo "--- Logical Volumes ---" sudo lvs 2>/dev/null || echo "No LVs" echo "" echo "=== Disk Health ===" for disk in $(lsblk -dn -o NAME | grep -E '^sd|^nvme'); do echo "--- /dev/$disk ---" sudo smartctl -H "/dev/$disk" 2>/dev/null | grep -i 'health\|result' || echo "SMART not available" done