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 Linux News
  1. Using The New LLVM/Clang OpenMP Support
  2. Zapcc Claims To Be A "Much Faster C++ Compiler"
  3. Godot 1.1 Engine Release Brings New 2D Engine
  4. Intel VA-API Driver 1.6 Is Coming
  5. Canonical Is Reportedly Considering An IPO
  6. GNOME 3.18 - GTK3 Now Supports RandR 1.5
  7. Fedora 22 Risks Being Delayed Beyond Next Week
  8. Systemd 220 Has Finally Been Released
  9. LibreOffice 5.0 Beta 1 Released
  10. Allwinner Publishes New CedarX Open-Source Code
  11. ACPI 6 Non-Volatile Memory Device Support / NFIT / LIBND For Linux
  12. Fedora 22 Marches Closer To Release
Latest Articles & Reviews
  1. Btrfs RAID 0/1 Benchmarks On The Linux 4.1 Kernel
  2. The State Of Various Firefox Features
  3. Intel Iris Graphics Performance With Mesa 10.6
  4. Fedora Workstation 22 Is Looking Great, Running Fantastic
Most Viewed News This Week
  1. The Linux 4.0 Kernel Currently Has An EXT4 Corruption Issue
  2. Rust 1.0 Language Officially Released
  3. AMDGPU Open-Source Driver Code Continues Maturing
  4. Oculus Rift Suspends Linux Development To Focus On Windows
  5. Wine 1.7.43 Works On Desktop Shell Window Support
  6. Spec Ops: The Line Is The Latest Linux Shooter
  7. RadeonSI Gallium3D Driver To Be Enabled For Android
  8. Microsoft Open-Sources The Windows Communication Foundation