The OpenZFS project has released version 2.4, adding support for the Linux 6.18 LTS kernel along with several performance and management enhancements. This update introduces features like default quotas and improved encryption, benefiting users on Linux and FreeBSD systems. The release emphasizes reliability and efficiency in file system operations.
OpenZFS 2.4, the latest stable version of this advanced file system and volume manager, became available on December 18, 2025. It supports Linux kernels ranging from 4.18 to the newest 6.18 LTS, as well as FreeBSD versions from 13.3 onward up to 14.0 and later.
Key additions include the ability to set default user, group, and project quotas, streamlining storage allocation. For input/output operations, direct IO now falls back to a lightweight uncached mode when dealing with unaligned accesses, enhancing compatibility. A new algorithm aims to minimize vdev fragmentation, improving long-term performance.
Encryption sees gains through AVX2 acceleration for AES-GCM, boosting speed in secure environments. The special_small_blocks feature has expanded to handle ZVOL writes on dedicated vdevs and now accepts non-power-of-two sizes. Administrators gain the 'zfs rewrite -P' command, which preserves logical birth times to reduce incremental stream sizes during backups.
Further tools include enabling ZIL on special vdevs for better logging, an '-a' or '--all' option to process all imported pools during scrubs, trims, or initializations, and a 'zpool scrub -S -E' command for targeting specific time ranges. Optimizations cover deduplication, block cloning, and the new 'send:encrypted' permission. Topology rules for special and dedup vdevs are less restrictive, while tools like arc_summary have been renamed to zarcsummary and arcstat to zarcstat. Ashift management is refined, and slow child vdevs can temporarily pause. Gang block handling receives multiple fixes.
Originally developed for Solaris, OpenZFS now thrives under community maintenance, offering safeguards against data corruption, vast storage support, native encryption, replication, compression, snapshots, clones, and ongoing integrity checks for Linux and FreeBSD users.
