Understanding EXT4 vs XFS vs Btrfs Filesystems

Choosing the right filesystem for your VPS affects performance, reliability, and available features. This guide compares the three most common Linux filesystems — EXT4, XFS, and Btrfs — to help you make an informed choice.

EXT4 (Fourth Extended Filesystem)

EXT4 is the default filesystem on most Linux distributions. It is mature, well-tested, and reliable.

Key Features

• Maximum file size: 16 TiB
• Maximum filesystem size: 1 EiB
• Journaling for crash recovery
• Extent-based allocation (efficient for large files)
• Delayed allocation (improves write performance)
• Online resizing (grow while mounted)

# Create an EXT4 filesystem
sudo mkfs.ext4 /dev/vdb1

# Check filesystem health
sudo e2fsck -f /dev/vdb1

# Tune EXT4 parameters
sudo tune2fs -l /dev/vdb1     # View current settings
sudo tune2fs -m 1 /dev/vdb1   # Reduce reserved space from 5% to 1%

# Resize (grow) while mounted
sudo resize2fs /dev/vdb1

XFS

XFS is the default filesystem on RHEL/Rocky/AlmaLinux. It excels at handling large files and high-throughput workloads.

Key Features

• Maximum file size: 8 EiB
• Maximum filesystem size: 8 EiB
• Excellent parallel I/O performance
• Online defragmentation
• Cannot be shrunk (only grown)
• Better performance with many CPUs

# Create an XFS filesystem
sudo mkfs.xfs /dev/vdb1

# Check filesystem health
sudo xfs_repair /dev/vdb1

# View filesystem info
sudo xfs_info /dev/vdb1

# Online defragmentation
sudo xfs_fsr /dev/vdb1

# Grow the filesystem
sudo xfs_growfs /mountpoint

Btrfs (B-tree Filesystem)

Btrfs is a modern copy-on-write filesystem with advanced features. It is the default on some distributions (openSUSE, Fedora Workstation).

Key Features

• Copy-on-write (CoW) — efficient snapshots
• Built-in RAID support (RAID 0, 1, 10)
• Transparent compression (zstd, lzo, zlib)
• Snapshots and subvolumes
• Online filesystem check and repair
• Data checksumming (detects corruption)

# Create a Btrfs filesystem
sudo mkfs.btrfs /dev/vdb1

# Create a subvolume
sudo btrfs subvolume create /mnt/data/@home

# Create a snapshot
sudo btrfs subvolume snapshot /mnt/data /mnt/data/snapshots/2025-01-15

# Enable compression
sudo mount -o compress=zstd /dev/vdb1 /mnt/data

# Check filesystem
sudo btrfs scrub start /mnt/data
sudo btrfs scrub status /mnt/data

Performance Comparison

Recommendations

Choose EXT4 If:

• You want maximum compatibility and reliability
• General-purpose web servers and databases
• You do not need advanced features like snapshots
• You are using Ubuntu or Debian (default)

Choose XFS If:

• You handle large files (media, backups, scientific data)
• You need high parallel I/O throughput
• You use RHEL/Rocky/AlmaLinux (default)
• You never need to shrink the filesystem

Choose Btrfs If:

• You need instant snapshots for backup/rollback
• You want built-in compression to save space
• You need data integrity verification (checksumming)
• You want software RAID without mdadm

Checking Your Current Filesystem

# Check filesystem type
df -T
# Or
lsblk -f
# Or
cat /etc/fstab

For most VPS workloads, EXT4 is the safest and most performant choice. XFS is excellent for large file workloads, and Btrfs shines when you need snapshots or compression. All three are production-ready in 2025/2026.