The Journaled File System (JFS) is a journaling file system that was open-sourced by IBM in 1999. Most Linux distributions support JFS. It is low on resource usage and comparatively fast doing all kinds of filesystem operations.
JFS journals metadata only, which means that metadata will remain consistent but user files may be corrupted after a crash or power loss.
Support for which has been available in the Linux kernel since 2002.
This is free and open source software.
Key Features
- Fully 64-bit.
- Uses a B+ tree to accelerate lookups in directories. JFS can store 8 entries of a directory in the directory’s inode before moving the entries to a B+ tree. JFS also indexes extents in a B+ tree.
- Dynamically allocates space for disk inodes as necessary.
- Directory structures designed for speed and efficiency:
- Directories with eight or fewer entries have their contents storied inline within that directory’s i-node.
- Directories with more than eight entries have their contents stored in a B+ tree keyed on name.
- JFS uses extents for allocating blocks for large files.
- Support for extended attributes in addition to standard Unix-style permissions.
- Support for both internal and external logs (see below).
- Extremely Scalable; Consistent performance from minimum file size up to 4 petabytes.
- Algorithms designed for high performance on very large systems.
- Performance tuned for Linux.
- Designed from the ground up to provide Transaction/Log (not an add-on).
- Restarts after a system failure < 1 sec.
- Proven Journaling FS technology (10+ years in AIX).
- Original design goals: Performance, Robustness, SMP.
- Designed to operate on SMP hardware, with code optimized for at least a 4-way SMP machine.
- TRIM support.
Website:
Support:
Developer: IBM
License: GNU General Public License v2.0
Related Software
| Journaling File Systems | |
|---|---|
| ext4 | Evolved from ext3 adding many notable features including extents |
| XFS | Designed to maintain high performance with large files and file systems |
| Btrfs | Checksumming Copy on Write File system |
| F2FS | Flash file system initially developed by Samsung Electronics |
| OpenZFS | Advanced file system and volume manager originally developed for Solaris |
| GFS2 | Shared disk file system for Linux computer clusters |
| ext3 | Default file system for many popular Linux distributions |
| JFS | Journaled File System |
| UBIFS | File system for raw flash memory used through UBI volumes |
| OCFS2 | Extent-based cluster file system |
| Bcachefs | Advanced file system ejected from the mainline kernel |
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