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Linux Storage Guide 2025: Cloud, RAID, LVM, Btrfs & ZNS SSD

Complete guide to modern storage technologies: media, file systems, Linux commands and cloud solutions
Reading time: 15 min
Storage Linux RAID LVM Btrfs Cloud

Complete guide to Linux storage technologies: RAID, LVM, Btrfs, ZNS SSD, cloud solutions and performance optimization

Introduction

SafeITExperts.com makes IT expertise accessible to everyone. This 2025 Storage Reference Guide compiles the latest advances in Linux storage and beyond: ZNS SSD, Btrfs, RAID, LVM, and cloud. An essential resource to understand media, interfaces and data management tools in 2025.

1. Physical Media and Interfaces

Physical media and their interfaces form the foundation of modern storage, defining performance and use cases. This section explores hardware technologies and their connections.

💡 Tip: Hover or tap on the technologies below to display additional details.

Storage Media (Hardware)

HDDSSDSSD TLC/QLCNVMe SSDZNS SSDOptane PMemeMMCUSB StorageMemory Cards

Virtual Storage

SwaptmpfsVDI (VirtualBox)VMDK (VMware)QCOW2 (QEMU/KVM)VHD/VHDX (Hyper-V)RAMdiskContainer Images

Interfaces

SATA III (6 Gbps)SAS-4 (24 Gbps)PCIe (4.0 / 5.0)USB4 v2.0Thunderbolt 5UFS 4.0

Low-Level Concepts

Sector (512b/4K/16K/64K)LBAZNSNVMe-oF RDMAAdvanced Wear Leveling

2. Partitioning Schemes

Once physical media is defined, partitioning organizes disks to optimize their usage.

📏
Schemes
Click to discover

MBR: Legacy format, limited to 2TB
GPT: Modern format, up to 9.4 ZB
UEFI: Replaces BIOS, requires GPT

Partitioning Tools
ToolGPTMBR
fdisk✔️
gdisk✔️
sgdisk✔️
parted✔️✔️
cfdisk✔️
cgdisk✔️
sfdisk✔️

3. File System Types by Platform

Discover file systems adapted to each operating environment and your specific needs.

Linux
ext4, XFS, Btrfs, ZFS, F2FS
ext4: Stability
XFS: Large files
Btrfs: Snapshots
ZFS: Integrity
F2FS: Flash-optimized
Windows
NTFS, FAT32, exFAT
NTFS: Journaling
FAT32: Compatibility
exFAT: Files >4GB
Apple
APFS, HFS+
APFS: Snapshots, encryption
HFS+: Compatibility
Cloud/Object
S3
S3: Unlimited scalability
11x9 durability

4. Popular File Systems in 2025

File systems evolve to address new storage challenges. Discover the most used formats and notable innovations this year.

File systems comparison
FSStrengthsUse Cases
ext4Proven stabilityServers, default distributions
XFSLarge file performanceDatabases, 4K+ video
BtrfsSnapshots, compressionWorkstations, NAS
ZFSIntegrity, native RAIDEnterprise storage
F2FSFlash-optimizedSmartphones, IoT, SD cards
NTFSJournaling, advanced ACLsWindows system disks
exFATMulti-OS compatibilityModern external drives
APFSSnapshots, native encryptionmacOS, Apple SSD disks
S3Unlimited scalabilityCloud object storage, archives
Overlay2UnionFS, immutable layersDocker/Podman runtime

5. Storage Management and Administration

Effective storage management relies on appropriate tools and commands.

Parted
Create GPT partition table
Command
parted /dev/sdx mklabel gpt		Example
sudo parted /dev/sda mklabel gpt		Function
Create GPT table
List partitions
Command
parted /dev/sdx print		Example
sudo parted /dev/sda print		Function
Display disk partition table
Create partition
Command
parted /dev/sdx mkpart [name] [fs_type] [start] [end]		Example
sudo parted /dev/sdb mkpart primary btrfs 0% 100G		Function
Create 100GB Btrfs partition
Set partition flags
Command
parted /dev/sdx set [num] [flag] [on/off]		Example
sudo parted /dev/sda set 1 esp on
sudo parted /dev/sda set 1 boot on
sudo parted /dev/sda set 2 swap on		Function
Configure special partition attributes
Complete partitioning examples
UEFI system with GPT
sudo parted /dev/sda mklabel gpt
sudo parted /dev/sda mkpart ESP fat32 1MiB 512MiB
sudo parted /dev/sda set 1 esp on
sudo parted /dev/sda mkpart root ext4 512MiB 100%Non-interactive mode
sudo parted -s /dev/sdb mklabel gpt mkpart primary ext4 0% 100%
ZFS
Command
zpool create		Example
sudo zpool create tank /dev/sdb		Function
Create ZFS pool
Command
zpool list		Example
zpool list		Function
List pools
Command
zpool status		Example
zpool status tank		Function
Check pool status
Command
zfs create		Example
sudo zfs create tank/data		Function
Create dataset
Command
zfs list		Example
zfs list		Function
List datasets
Command
zfs destroy		Example
sudo zfs destroy tank/data		Function
Destroy dataset
Command
zfs snapshot		Example
sudo zfs snapshot tank/data@backup		Function
Create snapshot
Command
zfs list -t snapshot		Example
zfs list -t snapshot		Function
List snapshots
Command
zfs destroy		Example
sudo zfs destroy tank/data@backup		Function
Delete snapshot
Command
zfs send | zfs receive		Example
zfs send tank/data@backup | zfs receive backup/data		Function
Send snapshot
Command
zpool scrub		Example
sudo zpool scrub tank		Function
Integrity check
Command
zpool scrub -s		Example
sudo zpool scrub -s tank		Function
Stop scrub
Command
zfs list -o space		Example
zfs list -o space tank/data		Function
Used/available space
LVM
Command
pvcreate		Example
sudo pvcreate /dev/sdX		Function
Create physical volume
Command
pvdisplay		Example
pvdisplay		Function
List existing PVs
Command
pvs		Example
pvs		Function
PV summary
Command
vgcreate		Example
sudo vgcreate vg_data /dev/sdX		Function
Create volume group
Command
vgdisplay		Example
vgdisplay		Function
List VGs
Command
vgs		Example
vgs		Function
VG summary
Command
vgextend		Example
sudo vgextend vg_data /dev/sdY		Function
Add PV to VG
Command
lvcreate		Example
sudo lvcreate -n lv_home -L 50G vg_data		Function
Create logical volume
Command
lvdisplay		Example
lvdisplay		Function
List LVs
Command
lvs		Example
lvs		Function
LV summary
Command
lvextend		Example
sudo lvextend -L +20G /dev/vg_data/lv_home		Function
Extend LV
Command
lvreduce		Example
sudo lvreduce -L -10G /dev/vg_data/lv_home		Function
Reduce LV
Command
mkfs.ext4		Example
sudo mkfs.ext4 /dev/vg_data/lv_home		Function
Format LV as ext4
Command
mount		Example
sudo mount /dev/vg_data/lv_home /home		Function
Mount LV
Command
vgdisplay		Example
vgdisplay vg_data		Function
Free space in VG
Command
pvck		Example
pvck /dev/sdX		Function
Verify PV/LV integrity
Command
lvremove		Example
sudo lvremove /dev/vg_data/lv_home		Function
Remove LV
Command
vgremove		Example
sudo vgremove vg_data		Function
Remove VG
Command
pvremove		Example
sudo pvremove /dev/sdX		Function
Remove PV
RAID
Command
cat /proc/mdstat		Example
cat /proc/mdstat		Function
Check RAID status
Command
mdadm --detail		Example
mdadm --detail /dev/md0		Function
RAID details
Command
mdadm --create		Example
sudo mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sda1 /dev/sdb1		Function
Create RAID array
Command
mdadm --add		Example
sudo mdadm --add /dev/md0 /dev/sdc1		Function
Add disk
Command
mdadm --fail		Example
sudo mdadm --fail /dev/md0 /dev/sda1		Function
Mark disk as failed
Command
mdadm --remove		Example
sudo mdadm --remove /dev/md0 /dev/sda1		Function
Remove disk
Command
mdadm --grow		Example
sudo mdadm --grow /dev/md0 --raid-devices=3		Function
Resize array
Command
mdadm --assemble		Example
sudo mdadm --assemble --scan		Function
Assemble array
Command
mdadm --detail --scan		Example
sudo mdadm --detail --scan | sudo tee -a /etc/mdadm/mdadm.conf		Function
Save configuration
Command
update-initramfs		Example
sudo update-initramfs -u		Function
Update initramfs
Command
mdadm --stop		Example
sudo mdadm --stop /dev/md0		Function
Stop array
Command
mdadm --remove		Example
sudo mdadm --remove /dev/md0		Function
Delete array

Swap Management

Swap Files
Command
fallocate		Example
sudo fallocate -l 2G /swapfile		Function
Create swap file
Command
mkswap		Example
sudo mkswap /swapfile		Function
Format swap file
Command
swapon		Example
sudo swapon /swapfile		Function
Enable swap
Command
swapoff		Example
sudo swapoff /swapfile		Function
Disable swap
Command
swapon --show		Example
swapon --show		Function
Check active swap
RAM Swap (zram)
DistroInstallationConfiguration
Debian/Ubuntusudo apt install zram-toolsEdit /etc/default/zramswap
openSUSEsudo zypper install systemd-zram-serviceEdit /etc/systemd/zram-generator.conf
Arch LinuxPreinstalledCreate /etc/systemd/zram-generator.conf
Fedorasudo dnf install zram-generatorEdit /etc/systemd/zram-generator.conf
NixOSConfigure in configuration.nixboot.zram.enable = true;

Mounting and Identification

Mount Commands
Command
mount		Example
sudo mount /dev/sda1 /data		Function
Mount filesystem
Command
mount -a		Example
sudo mount -a		Function
Mount all filesystems from /etc/fstab
Command
umount		Example
sudo umount /data		Function
Unmount filesystem
Command
umount -l		Example
sudo umount -l /data		Function
Lazy unmount
Command
umount -f		Example
sudo umount -f /data		Function
Force unmount
Command
findmnt		Example
findmnt		Function
Check active mounts

Maintenance and Copy

Maintenance Commands
Command
dd		Example
sudo dd if=/dev/sda of=/dev/sdb bs=64K conv=noerror,sync status=progress		Function
Raw bit-by-bit copy
Command
ddrescue		Example
sudo ddrescue -f -n /dev/sda /dev/sdd rescue.log		Function
Copy with error handling
Command
rsync		Example
sudo rsync -aAXv --progress /source/ /dest/		Function
Incremental copy
Command
cp --reflink		Example
cp --reflink=auto largefile /mnt/backup/		Function
Lightweight cloning (CoW)

Cleanup and Maintenance

Command Example Function
wipefs sudo wipefs --all /dev/sda1 Erase filesystem or RAID signatures
shred sudo shred -vfz /dev/sda Secure data erasure and overwriting
zerofree sudo zerofree /dev/sda1 Fill free blocks with zeroes (sparse/VM optimization)

Containers

Container Commands
Command
docker pull		Example
docker pull ubuntu:latest		Function
Pull image
Command
docker create		Example
docker create --name my-container ubuntu:latest		Function
Create container
Command
docker run		Example
docker run -it --rm ubuntu bash		Function
Run interactive container
Command
docker ps		Example
docker ps -a		Function
List containers
Command
docker rm		Example
docker rm my-container		Function
Remove container
Command
docker rmi		Example
docker rmi nginx:latest		Function
Remove image

6. Creating File Systems

Essential commands for formatting file systems.

Formatting Commands
CommandSystemExample
mkfs.ext4ext4mkfs.ext4 /dev/sda1
mkfs.xfsXFSmkfs.xfs -f /dev/nvme0n1p2
mkfs.btrfsBtrfsmkfs.btrfs /dev/md0
mkfs.f2fsF2FSmkfs.f2fs /dev/mmcblk0p2
mkfs.ntfsNTFSmkfs.ntfs -Q /dev/sdc1
mkfs.exfatexFATmkfs.exfat /dev/sdd1
mkswapSwapmkswap /dev/sda2

7. Btrfs Administration

Btrfs Commands
Command
mkfs.btrfs		Example
sudo mkfs.btrfs /dev/sdX1		Function
Create filesystem
Command
mount -o compress		Example
sudo mount -o compress=zstd /dev/sdX1 /mnt		Function
Mount with compression
Command
findmnt -t btrfs		Example
findmnt -t btrfs		Function
List Btrfs volumes
Command
btrfs subvolume list		Example
sudo btrfs subvolume list /mnt		Function
List subvolumes
Command
btrfs subvolume create		Example
sudo btrfs subvolume create /mnt/@data		Function
Create subvolume
Command
btrfs subvolume delete		Example
sudo btrfs subvolume delete /mnt/@data		Function
Delete subvolume
Command
btrfs subvolume snapshot		Example
sudo btrfs subvolume snapshot /mnt/@data /mnt/@data_backup		Function
Create snapshot
Command
btrfs send | btrfs receive		Example
sudo btrfs send /mnt/@data_backup | sudo btrfs receive /mnt/backup_target		Function
Snapshot replication
Command
btrfs scrub start		Example
sudo btrfs scrub start /mnt		Function
Integrity verification
Command
btrfs filesystem df		Example
sudo btrfs filesystem df /mnt		Function
Used/available space
Command
btrfs balance start		Example
sudo btrfs balance start -dusage=80 /mnt		Function
Rebalance allocation

Storage Glossary

Key terms to master storage in 2025

ZNS
Click to discover
Zoned Namespace: SSD technology organizing data in zones to reduce write amplification
Click to return
NVMe
Click to discover
Non-Volatile Memory Express: High-performance protocol for accessing SSDs via PCIe
Click to return
LVM
Click to discover
Logical Volume Manager: System for managing logical volumes to abstract physical storage
Click to return
RAID
Click to discover
Redundant Array of Independent Disks: Technique for grouping disks for redundancy and/or performance
Click to return
Btrfs
Click to discover
B-tree File System: Modern filesystem with snapshots, compression and integrity checking
Click to return
iSCSI
Click to discover
Internet Small Computer System Interface: Network storage protocol over IP
Click to return

Linux Storage Quiz

Test your knowledge of storage technologies

1
Which command creates an LVM logical volume?
Click to flip
lvcreate
Click to return
2
Which filesystem natively supports snapshots?
Click to flip
Btrfs and ZFS
Click to return
3
Which interface offers highest throughput for SSDs?
Click to flip
PCIe 5.0 (NVMe)
Click to return
4
Which SSD technology reduces write amplification?
Click to flip
ZNS (Zoned Namespaces)
Click to return
5
Which command initializes a disk for LVM?
Click to flip
pvcreate
Click to return
6
Which filesystem is optimized for flash storage?
Click to flip
F2FS (Flash-Friendly File System)
Click to return

Quiz completed!

8. Conclusion

Future of Storage

This 2025 Linux Storage Guide provides an overview of current technologies, from physical media like ZNS SSDs to filesystems like Btrfs, through RAID architectures, LVM, and cloud solutions. Designed for enthusiasts and professionals alike, it compiles essential tools and concepts to understand and manage storage on Linux and beyond.

Stay tuned for Part 2, "Storage Unit Optimization", which will explore advanced techniques to maximize performance, reliability and efficiency in 2025.

Useful Resources

ResourceDescriptionLink
Kernel.org Block & StorageOfficial Linux kernel documentation on the block layer, device drivers, and file systemsView Kernel.org
OpenZFS DocsOfficial OpenZFS reference documentation: architecture, Zpool storage pools, datasets, and snapshotsView OpenZFS
Btrfs DocumentationBtrfs reference guides: subvolume management, zstd compression, scrub, and repairView Btrfs Docs
NVM Express (NVMe & ZNS)Official protocol specifications for NVMe standards and Zoned Namespaces architecturesView NVM Express

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