Linux Disk and Storage Management Commands

Linux provides powerful command-line tools for checking disk usage, inspecting storage devices, managing filesystems, and troubleshooting storage problems. These commands are useful for both desktop users and system administrators.

Why Learn Linux Storage Commands?

Disk space and storage problems can cause applications to fail, logs to stop writing, and systems to become unstable. Linux storage commands help identify available space, locate large files, and understand how disks and filesystems are being used.

              
TEXT

            Inspect Disk → Check Space → Find Large Files → Check Filesystem → Mount Storage → Monitor Usage

Checking Disk Space with df

The df command displays available and used disk space for mounted filesystems.

              
BASH

            df -h
df -Th

Checking Directory Usage with du

The du command shows how much disk space files and directories are using. It is useful for finding directories that consume large amounts of storage.

              
BASH

            du -sh /var/log
du -sh *
du -h --max-depth=1

Listing Storage Devices with lsblk

The lsblk command displays information about block devices such as disks, partitions, and logical volumes.

              
BASH

            lsblk
lsblk -f

Checking Disk Information with fdisk

The fdisk command can display and manage disk partition tables. Use partitioning commands carefully because incorrect changes can result in data loss.

              
BASH

            sudo fdisk -l

Understanding Filesystems

A filesystem defines how data is organized and stored on a storage device. Linux supports filesystems such as ext4, XFS, Btrfs, and others.

Filesystem	Common Use	General Characteristic
ext4	General Linux systems	Mature and widely supported
XFS	Servers and large filesystems	Designed for scalability
Btrfs	Advanced storage management	Supports snapshots and other features

Mounting a Filesystem

The mount command attaches a filesystem to a directory in the Linux filesystem hierarchy.

              
BASH

            sudo mount /dev/sdb1 /mnt/data
mount | grep /mnt/data

Unmounting Storage

The umount command safely detaches a mounted filesystem. The filesystem should not be actively used when unmounting it.

              
BASH

            sudo umount /mnt/data

Checking Inodes

A filesystem can run out of inodes even when free disk space remains. The df -i command displays inode usage.

              
BASH

            df -i

Linux Storage Command Table

Command	Purpose	Example
df	Check filesystem space	df -h
du	Check directory usage	du -sh /var/log
lsblk	List block devices	lsblk -f
fdisk	Inspect partitions	sudo fdisk -l
mount	Mount a filesystem	sudo mount /dev/sdb1 /mnt/data
umount	Unmount a filesystem	sudo umount /mnt/data

Example Storage Troubleshooting Scenario

              
TEXT

            Application Fails → Check df -h → Find Full Filesystem → Use du → Locate Large Data → Clean or Expand Storage

Common Linux Storage Problems

Filesystem running out of space
Too many files consuming inodes
Large log files
Incorrect mount configuration
Unmounted storage devices
Filesystem errors

Common Mistakes to Avoid

Deleting files without checking their purpose
Running partitioning commands without backups
Unmounting an active filesystem
Ignoring inode usage
Editing filesystem configuration incorrectly

Advanced Linux Storage Concepts

Logical Volume Management
RAID
Filesystem snapshots
Disk quotas
Storage encryption
Network-attached storage
Persistent storage for containers

Practice Exercises

Check available disk space
Find the largest directories
List all block devices
Identify mounted filesystems
Check inode usage
Mount a test filesystem
Safely unmount the filesystem

Conclusion

Linux disk and storage commands make it easier to understand how storage is being used and to troubleshoot common filesystem problems. Commands such as df, du, lsblk, mount, and umount are essential tools for Linux administration.

Note: Note: Always verify storage devices and mount points before making changes, and maintain backups before performing partition or filesystem operations.