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Linux Foundation End User Summit: New BtrFS Filesystem and Knowledge Center

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| The Linux Foundation got positive results from its first ever End User Summit
| in New York October 14 and 15. Its concept of "end user" ended up including
| not only private users but many enterprises and organizations.



Btrfs 0.16, Improved Scalability And Performance

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| "Btrfs v0.16 is available for download," began Chris Mason, announcing the
| latest release of his new Btrfs filesystem. He noted, "v0.16 has a shiny new
| disk format, and is not compatible with filesystems created by older Btrfs
| releases. But, it should be the fastest Btrfs yet, with a wide variety of
| scalability fixes and new features." Improved scalability and performance
| improvements include fine grained btree locking, pushing CPU intensive
| operations such as checksumming into their own background threads, improved
| data=ordered mode, and a new cache to reduce IO requirements when cleaning up
| old transactions.



Btrfs 0.12, Performance Improvements

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| Btrfs was first announced in June of 2007, as an alpha-quality filesystem
| offering checksumming of all files and metadata, extent based file storage,
| efficient packing of small files, dynamic inode allocation, writable
| snapshots, object level mirroring and striping, and fast offline filesystem
| checks, among other features. The project's website explains, "Linux has a
| wealth of filesystems to choose from, 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." * * * *


Kernel space: a better btrfs

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| A powerful new filesystem for Linux already supports fast snapshots,
| checksums for all data, and online resizing--and plans to add ZFS-style
| built-in striping and mirroring. *


Btrfs Online Resizing, Ext3 Conversion, and More

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| Chris Mason announced version 0.10 of his new Btrfs filesystem, listing the
| following new features, "explicit back references, online resizing (including
| shrinking), in place conversion from Ext3 to Btrfs, data=ordered support,
| mount options to disable data COW and checksumming, and barrier support for
| sata and IDE drives". * *


Linux: Btrfs, File Data and Metadata Checksums

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| Chris Mason announced an early alpha release of his new Btrfs
| filesystem, "after the last FS summit, I started working on a new
| filesystem that maintains checksums of all file data and metadata." He
| listed the following features as "mostly implemented": "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), checksums on *
| data and metadata (multiple algorithms available), very fast offline
| filesystem check". * * * *


Interview: Chris Mason about Btrfs

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| Q: Several people might be interested what you think about ZFS, why you see a
| need for Btrfs “despite of ZFS” (some people think ZFS is the solution for
| everything for them). *
| * * Well, the short answer is that for Linux, there is no ZFS. I know about
| * * the FUSE port, but that isn’t a long term solution in terms of
| * * performance or enterprise workloads. ZFS has an impressive list of
| * * features (and clearly many happy users), but the real competition for
| * * Btrfs is other Linux filesystems. * *

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