1. Computers
  2. Display Drivers
  3. Graphics Cards
  4. Memory
  5. Motherboards
  6. Processors
  7. Software
  8. Storage
  9. Operating Systems


Facebook RSS Twitter Twitter Google Plus


Phoronix Test Suite

OpenBenchmarking Benchmarking Platform
Phoromatic Test Orchestration

DragonflyBSD Developing The HAMMER2 File-System

BSD

Published on 25 February 2012 09:52 AM EST
Written by Michael Larabel in BSD
3 Comments

While it's not part of this week's DragonflyBSD 3.0 release, Matthew Dillon is currently designing the HAMMER2 file-system to succeed his original HAMMER creation in Dragonfly.

The HAMMER2 file-system has been under-development already, but Dillon doesn't expect for anything usable prior to July. While it may be usable this summer, he doesn't believe it will be until "well into 2013" when "the whole mess is implemented and even later before the clustering is 100% stable." This is the only project Matthew Dillon is said to be working on this year.

HAMMER2 has many more features over the first HAMMER file-system, but Matthew Dillon says its design will be a lot simpler.

HAMMER2 is fundamentally different from HAMMER1 in that it uses a copy-on-write block design over a B-Tree design in the original DragonflyBSD file-system. Some of the HAMMER2 highlights include:

- Writable snapshots support with any sub-directory being able to be snapshotted. "Snapshots show up in the super-root. It is possible to snapshot a subdirectory and then later snapshot a parent of that subdirectory... really there are no limitations here."

- Multiple roots support so that snapshots can be mounted.

- Incremental queueless mirroring / mirroring-streams.

- Support for multiple compression algorithms on a sub-directory tree and file basis.

- Copies support for redundancy

- HAMMER2 is designed to be cluster-able with a multi-master protocol design in the long-term.

- Support for hard-links plus all other standard file-system features.

- De-duplication support will be supported and automatic. There will also be non-verified de-duplication as an option on a file or sub-directory basis.

Full details on the DragonflyBSD HAMMER2 file-system plans can be found in this mailing list message from earlier in the month.

From last year you can see original benchmarks of HAMMER compared to Btrfs and ZFS.

Meanwhile, the start of some DragonflyBSD 3.0 benchmarks can be found on OpenBenchmarking.org.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
Latest Articles & Reviews
  1. Radeon Linux Benchmarks: Catalyst 15.3 Beta vs. Linux 4.0 + Mesa 10.6-devel
  2. Trying Out The Modern Linux Desktops With 4 Monitors + AMD/NVIDIA Graphics
  3. Turning A Basement Into A Big Linux Server Room
  4. NVIDIA's $1000+ GeForce GTX TITAN X Delivers Maximum Linux Performance
  5. OS X 10.10 vs. Ubuntu 15.04 vs. Fedora 21 Tests: Linux Sweeps The Board
  6. The New Place Where Linux Code Is Constantly Being Benchmarked
Latest Linux News
  1. Firefox 37 Coming Today With Heartbeat, HTTPS Bing
  2. OpenIndiana 2015.03 Updates Its Solaris/Illumos Environment
  3. GNOME 3.16 SDK Runtime Now Available
  4. Initial Intel Braxton Support Might Come To Linux 4.1
  5. Why KDE's KWin Doesn't Integrate Weston/QtCompositor For Wayland Support
  6. Clang Now Supports Targeting The NaCl OS
  7. PC-BSD Updates Its Lumina Desktop (v0.8.3)
  8. Fedora 22 Alpha Now Available For AArch64 & PowerPC64
  9. Systemd Developers Did NOT Fork The Linux Kernel
  10. PulseAudio 7.0 To Enable LFE Remixing By Default
Most Viewed News This Week
  1. Introducing The Library Operating System For Linux
  2. Improved OpenCL Support For Blender's Cycles Renderer
  3. The Big Features Of The Linux 4.0 Kernel
  4. Open-Source Driver Fans Will Love NVIDIA's New OpenGL Demo
  5. Allwinner Continues Jerking Around The Open-Source Community
  6. GNOME 3.16 Released: It's Their Best Release Yet
  7. Ubuntu 15.04 Final Beta Released
  8. Systemd Change Allows For Stateless Systems With Tmpfs