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.org

Linux 3.9 Gets Btrfs RAID 5/6, Fsync Performance

Linux Kernel

Published on 02 March 2013 12:46 PM EST
Written by Michael Larabel in Linux Kernel
8 Comments

In addition to the already exciting features of the Linux 3.9 kernel, this next release will also bring several new features to the Btrfs file-system.

Chris Mason sent in the Btrfs 3.9 pull request to Linus Torvalds on Saturday morning. The most notable feature to this experimental file-system update is RAID 5 and RAID 6 support. RAID 5/6 support for Btrfs has been talked about for ages, but it's finally materialized in a state for mainline after new code appeared in early February.

While support for these RAID modes is going mainline, it's still considered experimental since Chris Mason is still working on a parity logging setup to avoid inconsistent parity after crashes. This RAID code though is being mainlined to hopefully spot any performance issues or other problems quickly in 3.9. The Btrfs scrub utility also doesn't correct RAID 5/6 errors at this time.

Aside from the new Btrfs RAID 5/6 support, there's also more work on improving the fsync performance. A change made for Linux 3.9 is to combine waiting for meta-data with waiting for data, which Chris describes as "a big latency win. It is also one step towards using atomics for the hardware during a commit."

Another update is a way to use Btrfs send/receive support to send only meta-data changes. This is particularly a change for SUSE to make Snapper more efficient at finding differences between Btrfs snapshots.

Yet another new feature for Btrfs is snapshot-aware defrag support.

Last but not least, there's a large number of fixes and clean-ups. More details can be found via the Btrfs 3.9 pull request.

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 Hardware Reviews
  1. Intel Xeon E5-1680 v3 & E5-2687W v3 Compared To The Core i7 5960X On Linux
  2. Intel 120GB 530 Series SSD Linux Performance
  3. Btrfs/EXT4/XFS/F2FS RAID 0/1/5/6/10 Linux Benchmarks On Four SSDs
  4. AMD's Windows Catalyst Driver Remains Largely Faster Than Linux Drivers
Latest Linux Articles
  1. Mesa Git Yields Performance Improvements For Newer AMD GPUs
  2. Apple OS X 10.10 vs. Ubuntu 14.10 Performance
  3. Mesa 10.5-devel Brings Some Intel Haswell HD Graphics Changes Over Mesa 10.3
  4. NVIDIA vs. Nouveau Drivers With Linux 3.18 + Mesa 10.4-devel
Latest Linux News
  1. Quantum OS Aims For A Linux Desktop With QML, Wayland & Material Design
  2. New Open-Source, Linux Benchmarks To Feast On
  3. FreeBSD Plans For The Next Ten Years
  4. Qt 5.4 Planned For Release On 9 December
  5. Meizu's Ubuntu Phone Not Expected Until Early Next Year
  6. DragonFlyBSD 4.0 Drops i386 Support, Improves Graphics
  7. Expensive "Free/Libre Software Laptop" Uses A NVIDIA GPU
  8. QEMU 2.2-rc3 Released, Final Release Pushed Back By Couple Days
  9. 64-bit ARM FreeBSD Support Is Taking Shape
  10. GCW Zero Starts Seeing New Game Releases
Latest Forum Discussions
  1. Updated and Optimized Ubuntu Free Graphics Drivers
  2. Hurrican SDL Port
  3. Roadmap to Catalyst 14.10 ?
  4. how to configure module phoromatic ?
  5. PulseAudio 6.0 Is Coming & Other Linux Audio Plans For The Future
  6. Debian Developer Resigns From The Systemd Maintainership Team
  7. Cant get working Kaveri APU - A10-7850k
  8. Script for Fan Speed Control