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DragonFly BSD
Last modified: Thursday, July 02, 2009
DragonFly BSD is a fork of FreeBSD 4.8 (June of 2003, by Matthew Dillon). It is based on the same class of operating system as BSD and Linux, but it takes a different direction from the FreeBSD, NetBSD and OpenBSD series. The DragonFly project focuses on rewriting most of the major kernel subsystems with a great deal of work in nearly every subsystem, particularly the filsystem APIs
and kernel core. The DragonFly project provides native clustering support in the kernel. In 2007, a new filesystem called HAMMER was developed for DragonFly. This filesystem has been designed to solve numerous issues and to add many new capabilities to DragonFly, such as fine-grained snapshots, instant crash recovery, and near real-time mirroring. The filesystem is also intended to serve as a basis for the clustering work that makes up the second phase of the project.
DragonFly BSD The new 2.2 release includes Hammer, a filesystem that includes instant crash recovery, multi-volume file systems, data integrity checking, fine grained history retention, and the capability to mirror data to other volumes.
Dragonfly BSD and the Hammer Filesystem Hammer is a fine-grained snapshot filesystem designed for large disks/media. Its sweet spot begins at 500GB, and it can handle up to 1 Exabyte of data. Hammer runs a snapshot every time the system syncs its mounts, in effect every 30-60 seconds. This history is retained and can easily be sifted through.
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