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. Ubuntu 15.04 Offers Faster OpenGL For AMD Radeon GPUs On Open-Source
  2. Ubuntu 15.04 Brings Some Graphics Performance Improvements For Intel Haswell
  3. Sub-$20 802.11n USB WiFi Adapter That's Linux Friendly
  4. The Lenovo T450s Is Working Beautifully With Linux
  5. Linux 4.0 SSD EXT4 / Btrfs / XFS / F2FS Benchmarks
  6. Linux 4.0 Hard Drive Comparison With Six File-Systems
Latest Linux News
  1. GCC 4.9.2 vs. GCC 5 Benchmarks On An Intel Xeon Haswell
  2. Intel Haswell/Broadwell Power Use On Linux Still Moving Lower
  3. QEMU 2.3 Officially Released
  4. It's Been Three Years Since The Big Steam Linux Reveal
  5. Debian-Based Distribution Updated With KDE 3.5 Forked Desktop
  6. Intel Is Making Some Progress With Compute Shaders
  7. Linux 4.1-rc1 Kernel Released, Packs In Several New Features
  8. It Doesn't Look Like KDBUS Will Make It For Linux 4.1
  9. Debian 9.0 Is Codenamed Stretch
  10. AMD Radeon GPUs With Linux 4.0 + Mesa 10.6-devel
Most Viewed News This Week
  1. Ubuntu's Desktop-Next Switching From .DEBs To Snappy
  2. Systemd Kills Off Shutdownd
  3. My Favorite Computer Desk Of The Past Decade For Less Than $100
  4. KDBUS Still Hasn't Been Pulled, Might Not Land For Linux 4.1
  5. AMD Open-Sources "Addrlib" From Catalyst
  6. Debian 8.0 Jessie Is Ready For Release This Weekend
  7. Qt Creator 3.4 Brings C++ Programming Improvements & More
  8. GIMP's Porting To GTK3 Continues