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Btrfs is a new copy on write (CoW) filesystem for Linux aimed at implementing advanced features while focusing on fault tolerance, repair and easy administration. Jointly developed at Oracle, Red Hat, Fujitsu, Intel, SUSE, STRATO and many others, Btrfs is licensed under the GPL and open for contribution from anyone.
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'''Btrfs is under heavy development, but every effort is being made to keep the filesystem stable and fast. Because of the speed of development, you should run the latest kernel you can (either the latest release kernel from kernel.org, or the latest -rc kernel.''' Please email the [[Btrfs mailing list]] if you have any problems or questions while using Btrfs.
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Linux has a wealth of filesystems from which to choose, but we are facing a number of challenges with scaling to the large storage subsystems that are becoming common in today's data centers. Filesystems need to scale in their ability to address and manage large storage, and also in their ability to detect, repair and tolerate errors in the data stored on disk.
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'''The main Btrfs features available at the moment include:'''
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* Extent based file storage
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* 2^64 byte == 16 EiB maximum file size
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* Space-efficient packing of small files
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* Space-efficient indexed directories
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* Dynamic inode allocation
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* Writable snapshots, read-only snapshots
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* Subvolumes (separate internal filesystem roots)
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* Checksums on data and metadata (crc32c)
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* [[Compression]] (zlib and LZO)
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* Integrated multiple device support
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** File Striping, File Mirroring, and File Striping+Mirroring implementations
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* SSD (Flash storage) awareness (TRIM/Discard for reporting free blocks for reuse) and optimizations (e.g. avoiding unnecessary seek optimizations, sending writes in clusters, even if they are from unrelated files. This results in larger write operations and faster write throughput)
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* Efficient incremental backup
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* Background scrub process for finding and fixing errors on files with redundant copies
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* Online filesystem defragmentation
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* [[btrfsck|Offline filesystem check]]
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* [[Conversion_from_Ext3|Conversion]] of existing ext3/4 file systems
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* [[Seed-device|Seed devices]]. Create a (readonly) filesystem that acts as a template to seed other Btrfs filesystems. The original filesystem and devices are included as a readonly starting point for the new filesystem. Using copy on write, all modifications are stored on different devices; the original is unchanged.
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* Subvolume-aware quota support
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* Send/receive of subvolume changes
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** Efficient incremental filesystem mirroring
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'''Additional features in development, or planned, include:'''
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* Very fast offline filesystem check
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* File Striping with Single and Dual Parity
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* Object-level mirroring and striping
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* Alternative checksum algorithms
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* Online filesystem check
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* Other compression methods (snappy, lz4)
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* Hot data tracking and moving to faster devices (currently being pushed as a generic feature available through VFS)
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== News ==
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''Coming in 3.8''
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* ability to replace devices at runtime in an effective way ([http://lwn.net/Articles/524589/ description])
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* speed improvements (cumulative effect of many small improvements)
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* a few more bugfixes
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'''Linux in 3.7 (Dec 2012)'''
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* ''fsync'' speedups
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* removed limitation of number of hardlinks in a single directory
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* file hole punching ([http://lwn.net/Articles/415889/ LWN article])
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* per-file ''NOCOW''
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* fixes to send/receive
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''' Enterprise btrfs support (Feb 2012)'''
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* Since February 2012 there are two vendors who support btrfs in their distributions, [[Getting_started#Enterprise_distributions_with_btrfs_support|Oracle and SUSE]].
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Read about past releases in the [[Changelog]]
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== Articles, presentations, podcasts ==
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* '''Article:''' [http://www.howtoforge.com/a-beginners-guide-to-btrfs A Beginner's Guide To Btrfs] (2012-11-26)
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* '''Article:''' [http://www.oracle.com/technetwork/articles/servers-storage-admin/advanced-btrfs-1734952.html How I Use the Advanced Capabilities of Btrfs] by Margaret Bierman with Lenz Grimmer (2012-08-11)
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* '''Article:''' [http://www.oracle.com/technetwork/articles/servers-storage-admin/gettingstarted-btrfs-1695246.html How I Got Started with the Btrfs File System for Oracle Linux] by Margaret Bierman with Lenz Grimmer (2012-07-11)
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* '''Paper:''' [http://domino.watson.ibm.com/library/CyberDig.nsf/1e4115aea78b6e7c85256b360066f0d4/6e1c5b6a1b6edd9885257a38006b6130!OpenDocument&Highlight=0,BTRFS draft] describing the overall concepts and architecture submitted to ACM TOS (2012-07-10)
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* '''Article:''' [http://www.funtoo.org/wiki/BTRFS_Fun Btrfs Fun] Wiki page on funtoo.org (2012-05)
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* '''Video:''' [http://video.linux.com/videos/btrfs-filesystem-status-and-new-features Btrfs Filesystem: Status and New Features] by Chris Mason at the 2012 Linux Foundation Collaboration Summit (2012-04-05)
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* '''Article''' [http://static.usenix.org/publications/login/2012-02/openpdfs/Bacik.pdf Btrfs - The Swiss Army Knife Of Storage] by Josef Bacik (2012-02)
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* '''Video:''' [http://www.youtube.com/watch?v=hxWuaozpe2I I Can't Believe This is Butter! A tour of btrfs] by Avi Miller at linux.conf.au (2012-01-18)
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* '''Article:''' [http://lwn.net/Articles/465160/ A btrfs update at LinuxCon Europe] on lwn.net (2011-11-02)
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* '''Podcast:''' [http://feedproxy.google.com/~r/OracleLinux/~3/kRqpaCdTlLg/10491325_Btrfs_071311.mp3 Podcast with Chris Mason: Btrfs overview and status update] (2011-07-13)
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* '''Video:''' [http://vimeo.com/15325851 The Story So Far] by Josef Bacik at LinuxCon Brazil (2010-08-31)
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* '''Article:''' [http://www.linux.com/learn/tutorials/371623-weekend-project-get-started-with-btrfs Linux.com Weekend Project: Get Started with Btrfs] (2010-10-15)
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* '''Webcast:''' [https://event.on24.com/eventRegistration/EventLobbyServlet?target=registration.jsp&eventid=233161&sessionid=1&key=D0B1D3285FA444C5745C344A1C859CE0&partnerref=banner&sourcepage=register State of "Btrfs" File System for Linux by Chris Mason] (2010-08-26) [email registration and flash required]
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* '''Article:''' [http://lwn.net/Articles/342892/ Valerie Aurora: A short history of btrfs] (2009-07-22)
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== Documentation ==
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=== Guides and usage information ===
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* [[Getting started]] — first steps, distributions with btrfs support
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** [[Mount options]]
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* [[FAQ]] — About the btrfs project and filesystem
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* [[UseCases]] — Recipes for how to do stuff with btrfs
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* [[SysadminGuide]] — A more in-depth guide to btrfs' concepts and a bit of its internals, to answer all those "but what ''is'' a subvolume?" kind of questions.
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* [[Using Btrfs with Multiple Devices|Multiple devices]] – A guide to the RAID features of Btrfs
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* [[Conversion_from_Ext3|Conversion from Ext3 and Ext4]]
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* [[Problem FAQ]] — Commonly-encountered problems and solutions.
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** [[Gotchas]] — lists known bugs and issues, but not necessarily solutions.
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=== Project information ===
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* [[Changelog]] — history of changes in linux kernel wrt btrfs
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* [[Glossary]]
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* Contact information:
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** [[Btrfs mailing list]]
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** [http://en.wikipedia.org/wiki/Internet_Relay_Chat IRC] on freenode.net in the channel [irc://irc.freenode.net:6667/btrfs #btrfs]
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* [[Project ideas]]
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* [[Cleanup ideas]]
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=== Using the built-in tools ===
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* [[Btrfs(command)|btrfs]] — main administration tool
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* [[Mkfs.btrfs|mkfs.btrfs]] — creating the filesystem
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* [[Btrfsck|btrfsck]] — repairing file systems
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* [[Restore|restore and find-root]] — utilities to find and restore data from an unmountable filesystem
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* [[Btrfs-convert|btrfs-convert]] — tool to convert in-place from ext2/3/4 filesystems to btrfs
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=== Developer documentation ===
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* [[Code documentation]] — trees, source files, sample code for manipulating trees
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* [[Data Structures]] — detailed on-disk data structures
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* [[Trees]] — detailed in-tree representation of files and directories
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* [[Btrfs design]] — design notes (possibly out of date in places)
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* [[Multiple Device Support]] — design notes
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* [[ENOSPC]] — Current ENOSPC design issues
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* [[Debugging Btrfs with GDB]]
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* [[Writing patch for btrfs]]
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* [[Unmerged Patches]] — patches with different features from btrfs mailing list
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==== Source code download ====
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* [[Btrfs source repositories]]
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* [http://git.kernel.org/?p=linux/kernel/git/mason/linux-btrfs.git;a=tree;f=fs/btrfs;hb=HEAD Gitweb source viewer] of the main kernel repository
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== Benchmarking ==
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* '''2012-05 [http://www.phoronix.com/scan.php?page=article&item=linux_34_fs&num=1 XFS, Btrfs, EXT4 Battle It Out On Linux 3.4]'''
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* '''2012-05 [http://cd34.com/blog/scalability/ext4-xfs-and-btrfs-benchmark-redux/ Ext4, XFS and Btrfs benchmark redux]'''
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* '''2012-03 [http://www.phoronix.com/scan.php?page=article&item=linux_btrfs_options&num=1 Testing Out The Btrfs Mount Options On Linux 3.2]'''
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* '''2012-03 [http://www.phoronix.com/scan.php?page=article&item=ubuntu_1204_fs&num=1 Ubuntu 12.04 LTS - Benchmarking All The Linux File-Systems]'''
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* '''2011-12 [http://btrfs.boxacle.net Btrfs Performance Analysis]'''
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* '''2011-11 [http://www.phoronix.com/vr.php?view=16773 Testing The "Pretty Beefy" Btrfs Changes In Linux 3.2]'''
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* '''2011-09 [http://www.phoronix.com/scan.php?page=article&item=btrfs_linux31_ssd&num=1 Testing EXT4 & Btrfs On A Serial ATA 3.0 SSD]'''
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* '''2011-05 [http://www.phoronix.com/scan.php?page=article&item=linux_2639_fs&num=1 Linux 2.6.39: XFS Speeds-Up, EXT4 & Btrfs Unchanged]'''
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* '''2011-03 [http://www.phoronix.com/scan.php?page=article&item=btrfs_lzo_2638&num=1 Btrfs LZO Compression Performance]'''
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* '''2010-12 [http://www.phoronix.com/scan.php?page=article&item=btrfs_space_cache&num=1 Benchmarks Of The Btrfs Space Cache Option]''' Comparing the performance of Btrfs using the default mount options, using the space_cache mount option, using the compress mount option for Btrfs file compression, and lastly using both the space_cache and compression mount options to benefit from the free space caching and Zlib compression.
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* '''2010 [http://www.mayrhofer.eu.org/ssd-linux-benchmark SSD Linux benchmarking: Comparing filesystems and encryption method]
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* '''2010-11 [http://www.phoronix.com/scan.php?page=article&item=linux_2637_ext4btrfs&num=1 Phoronix: The Linux 2.6.37 Kernel With EXT4 & Btrfs]''' Comparison between Btrfs and Ext4.
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* '''2010-10 [http://www.linux-mag.com/id/7876 One Billion Files]''' Btrfs performs well in comparison to other filesystems, when there are a billion files in the filesystem.
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* '''2009-05 [http://www.phoronix.com/scan.php?page=article&item=btrfs_ssd_mode&num=1 Phoronix Test With SSD Mode]''' This test show that btrfs is slower with ssd option activated. Ssd code has been updated during 2.6.30-rc and is expected to be faster.
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* '''2009-04 [http://www.phoronix.com/scan.php?page=article&item=btrfs_benchmarks&num=1 Phoronix Performance Test on Fedora 11 Preview]''' The phoronix workload is mostly CPU based, but they do have a few filesystem benchmarks. Btrfs performs well, but you can see the checksumming and metadata duplication show up on their single disk streaming write workload. dbench in general measures lots of different caching effects, and is not a great measure of everyday performance.
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* '''2008-10 [http://btrfs.boxacle.net Btrfs performance analysis by Steven Pratt and IBM]''' The benchmarks from IBM demonstrate some bottlenecks we have in the extent recording on large workloads. We're working on fixes for these.
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* '''2008-04 [[Multi-device Benchmarks]]'''
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Revision as of 10:31, 11 January 2013

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