Lass.cs.umass.edu/papers/pdf/FAST04.pdf. Red Hat Global File System (GFS) Btrfs. Btrfs (B-tree file system, variously pronounced: "Butter F S", "Butterface",[7] "Better F S",[5] "B-tree F S",[8] or simply by spelling it out) is a GPL-licensed copy-on-write file system for Linux. Development began at Oracle Corporation in 2007. As of August 2014[update], the file system's on-disk format has been marked as stable.[9] History[edit] The core data structure of Btrfs—the copy-on-write B-tree—was originally proposed by IBM researcher Ohad Rodeh at a presentation at USENIX 2007. Chris Mason, an engineer working on ReiserFS for SUSE at the time, joined Oracle later that year and began work on a new file system based on these B-trees.[11] In 2008, the principal developer of the ext3 and ext4 file systems, Theodore Ts'o, stated that although ext4 has improved features, it is not a major advance; it uses old technology and is a stop-gap.
Features[edit] As of version 3.14 of the Linux kernel, Btrfs implements the following features:[23][24] Planned features include: Cloning[edit] Ceph.