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. Scythe Mugen MAX
  2. Intel Core i7 5960X Haswell-E On Linux
  3. Intel 80GB 530 Series M.2 SSD On Linux
  4. With A New Motherboard, The Core i7 5960X Haswell-E Lights Up
Latest Linux Articles
  1. A Tour Of The New Phoronix Office
  2. 7-Way Linux Desktop Gaming Comparison On Ubuntu 14.10
  3. Intel P-State vs. CPUFreq Benchmarks On The i7-5960X
  4. RadeonSI GLAMOR Benchmarks With X.Org Server 1.16
Latest Linux News
  1. Linux 3.17-rc6 Released; Linux 3.17 Final Might Come In One Week
  2. X.Org Server 1.16.1 Released
  3. Mesa Gets Closer To Having OpenGL 4.0 Tessellation Support
  4. Uselessd: A Stripped Down Version Of Systemd
  5. F2FS Tools Gain FSCK Support
  6. FreeBSD 10.1 Has The New VT Driver, Hardware Improvements
  7. AntiMicro 2.6 Yields Greater Compatibility For Gamepads On Linux
  8. OpenGL 3.3 / GLSL 3.30 Lands For Intel Sandy Bridge On Mesa
  9. AMD's RadeonSI Gallium3D Driver Sees Some Improvements
  10. Mesa 10.3 Released With The Latest Open-Source GPU Driver Improvements
Latest Forum Discussions
  1. Wasteland 2 Officially Launched Today, Including For Linux Gamers
  2. NVIDIA GTX 770/780 -works ?
  3. Trolling on the Phoronix forums
  4. X.Org Women Outreach Program Only Turns Up Two Applicants So Far
  5. New stress testing utility for GPU's
  6. ASRock AM1H-ITX: One Of The Best AM1 Mini-ITX Motherboards
  7. Can Linux kill a motherboard?
  8. Stop grabbing my keyboard :(