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. AMD's New Athlon/Semprons Give Old Phenom CPUs A Big Run For The Money
  2. 13-Way Low-End GPU Comparison With AMD's AM1 Athlon
  3. ASUS AM1I-A: A Mini-ITX Board For Socketed Kabini APUs
  4. Mini-Box M350: A Simple, Affordable Mini-ITX Case
Latest Linux Articles
  1. How Much Video RAM Is Needed For Catalyst R3 Graphics?
  2. Ubuntu 12.04 LTS vs. 14.04 LTS Cloud Benchmarks
  3. Ubuntu 12.04.4 vs. 13.10 vs. 14.04 LTS Desktop Benchmarks
  4. AMD OpenCL Performance With AM1 Kabini APUs
Latest Linux News
  1. Packard Bell LM85 Now Supported By Coreboot
  2. AmazonBasics External USB 2.0 DVD Writer For Linux
  3. TP-LINK TG-3468: A $12 Linux PCI-E Gigabit Network Adapter
  4. Linux 3.15 Lands Some DRM Graphics Driver Fixes
  5. AMD Is Disabling DPM Support For RV770 GPUs
  6. ReactOS Working On A Community Windows OS
  7. eRacks Keeps Pushing Linux, Open-Source Systems After 15 Years
  8. Borderlands Is Being Considered For Linux
  9. Mesa 10.0 & 10.1 Stable Get Updated
  10. Git 2.0 Test Releases Begin With Many Changes
  11. Wine 1.7.17 Works On Its Task Scheduler, C Run-Time
  12. The Improv ARM Board Still Isn't Shipping; Riding A Dead Horse?
Latest Forum Discussions
  1. The GNOME Foundation Is Running Short On Money
  2. Updated and Optimized Ubuntu Free Graphics Drivers
  3. Catalyst 14.3 Beta
  4. Suggestions about how to make a Radeon HD 7790 work decently?
  5. Radeon 8000M problematic on Linux?
  6. Linux Kernel Developers Fed Up With Ridiculous Bugs In Systemd
  7. After Jack Keane, RuseSoft will briing Ankh 3 to Linux through Desura
  8. Suspected PHP Proxy Issue