Btrfs

Comparison Between Btrfs and XFS Filesystems

Comparison Between Btrfs and XFS Filesystems
There are many filesystems available for use with Linux. The most common Linux filesystems include Ext4, Btrfs, XFS, and ZFS. Every filesystem has its unique use cases, pros, and cons. Due to the variety of options available, you may have a hard time deciding which filesystem to use.To help you with your choice, this article compares the XFS and the Btrfs filesystems. If you are having a hard time deciding whether to use the XFS filesystem or the Btrfs filesystem, then this article should help. Let us begin!

Introduction to XFS and Btrfs Filesystems

XFS Filesystem: XFS is a high-performance 64-bit journaling filesystem. It was originally developed by Silicon Graphics, Inc. in 1993 for the IRIX operating system and was later ported to the Linux kernel in 2001.

Btrfs Filesystem: Btrfs or the B-Tree filesystem is a modern Copy-on-Write (CoW) filesystem. It is new compared to the Ext filesystem. Btrfs was originally designed for the Linux operating systems by the Oracle Corporation in 2007. In November 2013, the Btrfs filesystem was declared stable for the Linux kernel.

Feature Comparison

The XFS and Btrfs filesystems were designed to solve different types of problems. Though the design goal of the XFS filesystem was different than that of the Btrfs filesystem, because they are both filesystems, we may compare them in depth.

NOTE: You cannot create a file or directory with the name . and in either of the XFS or Btrfs filesystems.

NOTE: The filesystem snapshot is an important feature. You may take a snapshot of your filesystem using this feature before attempting any risky actions. If things do not go as planned, a snapshot allows you to go back to an earlier state in which everything in the system worked. This is a built-in feature of the Btrfs filesystem. You do not need any third-party tools or software to generate a snapshot of a Btrfs filesystem.

NOTE: Depulication is a technique for eliminating duplicate copies of data from the filesystem and keeping only one copy of the data (unique data) in the filesystem. This technique is used to save disk space.

NOTE: When a filesystem stores large files in a filesystem, the large file is broken into blocks, and the blocks are stored in the filesystem. The last block of the file, called the tail block, does not occupy the entire block. When many small files are stored, they do not occupy the entire block, and a lot of disk space is wasted. Block sub-allocation allows you to store parts of another file block in the tail block (the last block of another file that did not occupy the entire block) to save disk space.

NOTE: Tail packing is a part of block sub-allocation. As previously discussed, small files do not occupy an entire file block. To efficiently store small files (e.g., program source codes) in the filesystem, the tail block of a small file is used to store other small files. Tail packing improves filesystem performance and saves disk space in filesystems in which many small files (e.g., program source codes) are stored.

NOTE: An extent is a contiguous area of the storage device reserved for a file in a filesystem. Extent-based filesystems store large files in a contiguous storage area. This improves filesystem performance and increases storage efficiency.

NOTE: The filesystem allocates some buffer space in the system memory. When there are disk write requests, the filesystem does not write the data blocks directly on the storage device. Instead, the filesystem stores the data blocks in the buffer memory. When the buffer memory is full, the filesystem writes all the pending data blocks to the storage device at once. This reduces CPU usage, speeds up disk writes, and reduces disk fragmentation.

NOTE: When you remove a file from an SSD, the TRIM command notifies the SSD storage device of the pages (file blocks) that are no longer needed. The SSD erases the unnecessary pages (file blocks) from the flash storage and prepares the pages (file blocks) for storing new data. Without TRIM support, the SSD write speed would become progressively slower as the SSD fills with new data.

Advantages of XFS over Btrfs

XFS is a stable 64-bit journaling filesystem for high-capacity storage devices.

You may use the XFS filesystem for the following reasons:

The XFS filesystem supports parallel I/O and can provide multiple data streams for files due to its design.

The XFS filesystem supports partition sizes of up to 8 EiB (up to 8 EiB - 1 byte).

The XFS filesystem supports file sizes of up to 8 EiB (up to 8 EiB - 1 byte).

Journaling ensures data consistency in the filesystem in the event of a power outage or system crash. In the event of a power outage or system crash, the data stored in the journal will be recovered and applied to the filesystem.

This is an important feature of the XFS filesystem. It is essential for applications that require high read/write speed to storage devices. Direct I/O allows storage devices direct access to the data buffer using DMA (Direct Memory Access) so that the full I/O bandwidth of the storage device can be utilized.

The XFS filesystem can reserve the bandwidth of the storage device for certain applications. This feature is ideal for real-time applications (e.g., video streaming).

Disadvantages of the XFS Filesystem

There are some disadvantages to the XFS filesystem.

Disadvantages of the XFS filesystem include the following:

Compared to the Btrfs filesystem, the XFS filesystem does not have a built-in logical volume manager. So, you will have to use LVM 2 for logical volume management.

Compared to the Btrfs filesystem, the XFS filesystem does not have built-in RAID support. So, you will have to use dm-raid or mdadm to configure RAID.

The XFS filesystem does not have a filesystem snapshot feature, unlike the Btrfs filesystem.

As with some other journaling filesystems, you cannot disable the journaling feature of the XFS filesystem. Journaling is not good for USB flash drives. If you use the XFS filesystem on a USB flash drive, the lifetime of the USB flash disk will be reduced due to the journaling overload.

Advantages of Btrfs over XFS

The Btrfs filesystem is a modern Copy-on-Write (CoW) filesystem designed for high-capacity and high-performance storage servers. XFS is also a high-performance 64-bit journaling filesystem that is also capable of parallel I/O operations. The XFS filesystem contains many important features, including Direct I/O, Guaranteed-rate I/O, and more. Compared to the XFS filesystem, however, the Btrfs filesystem has many advantages.

The advantages of the Btrfs filesystem over the XFS filesystem include the following:

i) Built-in Filesystem-level snapshots.

ii) Multiple device support.

iii) Built-in RAID support.

iv) Flexible inode allocation.

v) Optimizations for storing smaller files (sparse files, block sub-allocation, tail packing, variable block size).

vi) Built-in filesystem-level compression support.

These are the filesystem features that may cause you to choose the Btrfs filesystem over the XFS filesystem.

Conclusion

This article compared the Btrfs and XFS filesystems, including a comparison of the most important features of each filesystem. This article should help you to decide between the Btrfs and XFS filesystems. Choose whichever system works best for you, according to your unique needs and preferences.

References:

  1. XFS - Wikipedia - https://en.wikipedia.org/wiki/XFS
  2. Comparison of file systems - Wikipedia - https://en.wikipedia.org/wiki/Comparison_of_file_systems
  3. XFS - ArchWiki - https://wiki.archlinux.org/index.php/XFS
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