特殊:Badtitle/NS100:Btrfs

{{#ifexist: :Btrfs/zh | | {{#ifexist: Btrfs/zh | | {{#ifeq: {{#titleparts:Btrfs|1|-1|}} | zh | | }} }} }} {{#ifeq: {{#titleparts:Btrfs|1|-1|}} | zh | | }}

What is btrfs

Basic description of btrfs. Strengths, weaknesses, why is this important, etc.

Features:

• Extent based file storage (2^64 max file size)
• Space efficient packing of small files
• Space efficient indexed directories
• Dynamic inode allocation
• Writable snapshots
• Subvolumes (separate internal filesystem roots)
• Object level mirroring and striping
• Checksums on data and metadata (multiple algorithms available)
• Compression
• Integrated multiple device support, with several raid algorithms
• Online filesystem check
• Very fast offline filesystem check
• Efficient incremental backup and FS mirroring
• Online filesystem defragmentation

How to install

Ubuntu 8.10 Intrepid

PPA deb packages

[[1]] Lines for sources.list.d:

deb http://ppa.launchpad.net/brcha/ppa/ubuntu intrepid main
deb-src http://ppa.launchpad.net/brcha/ppa/ubuntu intrepid main

Add the GPG key:

sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 17f547c39c5c4071e254d0a7313d312748a22a95

Download module source and btrfs tools:

sudo apt-get install btrfs btrfs-progs module-assistant

Build and install kernel module:

sudo module-assistant auto-install btrfs
sudo modprobe btrfs

Compile from Source

NOT ACTUALLY WORKING YET [| btrfs wiki getting started page]

Kernel Module Dependencies

8.10 Kernel 2.6.27-9-generic

• CONFIG_LIBCRC32C=m
• CONFIG_ZLIB_INFLATE=y
• CONFIG_ZLIB_DEFLATE=m
• build-essential: make, compiler, etc
• linux-headers-2.6.27-9-generic: latest kernel headers

sudo apt-get install build-essential linux-headers-2.6.27-9-generic

Patch: [[2]] Download, patch and compile code:

wget http://www.kernel.org/pub/linux/kernel/people/mason/btrfs/btrfs-0.17.tar.bz2
tar -jxvf btrfs-0.17.tar.bz2
cd btrfs-0.17
#apply patch
make

Currently btrfs does not work with kernel 2.6.27 Ensure modules are up and running, and insert btrfs module into kernel.

sudo modprobe libcrc32c zlib_inflate zlib_deflate
sudo insmod btrfs.ko

btrfs progs dependencies

sudo apt-get install e2fsprogs uuid-dev

wget http://www.kernel.org/pub/linux/kernel/people/mason/btrfs/btrfs-progs-0.17.tar.bz2
tar -jxvf btrfs-progs-0.17.tar.bz2
make

btrfs-progs compile fine

Ubuntu 9.04 Jaunty

TBD

How to use

• How to format disk as btrfs
• How to grow/shrink file system
• How to create snapshots
• How to access snapshots
• How to convert ext2/3(/4?) partitions to btrfs
• How to create an image of a btrfs file system
• How to restore from an image of a btrfs file system
• How to recover from a failed device
• How to add another device to file system

[wiki documentation category]

Alternatives

• Tux3?
• ZFS over Fuse?
• Hammer FS (DragonFly BSD)

Links

• [home page]
• [wikipedia page]
• [Installation BTRFS 0.18 on Ubuntu Intrepid(german)]