ext4 vs XFS Compared
Where Each File System Came From
ext4 vs XFS is a comparison of two journaling file systems that are both common on Linux servers. ext4 is a general-purpose file system that evolved from earlier ext versions. XFS was built for large files and high-throughput workloads.
ext4 is the default on many Debian and Ubuntu systems and has a long record of stable use, from desktops to small servers. XFS was originally developed by Silicon Graphics for demanding storage, and it is the default on many Red Hat family distributions. Both are mature, and either one will work for most hosting tasks. For the broader picture, see what a file system is.
Performance and Scalability
Performance depends on the workload. XFS is designed to handle very large files and many threads writing in parallel, and it scales well on big volumes. ext4 performs strongly on mixed workloads with many small files, such as everyday web and mail traffic.
For a typical website or mail server, the difference is often small compared with the effect of disk type, memory and application design. Differences show up mainly in heavy, specialized workloads, such as media storage or large parallel write jobs. Testing with a representative load is the only reliable way to compare.
Resizing, Repair and Administration
The two file systems differ in how they change size. ext4 can be grown while mounted and can also be shrunk, but shrinking requires the file system to be unmounted and checked first. XFS can be grown while mounted but cannot be shrunk at all.
Both file systems need to be unmounted for a full offline repair. The two also handle inodes, the per-file records, differently: ext4 sets its inode count when the file system is created, while XFS allocates inodes on demand. Administrators who expect a volume to shrink often choose ext4, while those who mainly grow volumes and store large files often choose XFS.
Choosing for Two Different Servers
A media server that stores large video files and keeps adding disks over time suits XFS. Its parallel write performance handles big sequential files well, and the volume can grow without downtime.
A shared hosting server with thousands of small customer files, and volumes that are sometimes resized down, suits ext4. Its flexibility with shrinking and its reliable behavior on small-file workloads matter more than peak throughput.
Frequently asked questions
Can XFS be shrunk?
No. An XFS file system can be grown while it is mounted, but it cannot be reduced in size. If a partition needs to become smaller, the data must be moved to a new, smaller file system. This is one reason administrators who expect to shrink volumes often prefer ext4.
Is ext4 or XFS faster?
Neither is faster in every case. Results depend on file sizes, the number of parallel writers, the storage hardware and the kernel version. XFS often performs well with large files and high concurrency, while ext4 is a strong general choice. Benchmark with a copy of your real workload before committing.