Ceph

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. 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. In 2011, de-fragmentation features were announced for version 3.0 of the Linux kernel.[21] Besides Mason at Oracle, Miao Xie at Fujitsu contributed performance improvements.[22] In June 2012, Chris Mason left Oracle, but still continues to work on Btrfs. Features[edit] Planned features include:

DRBD:What is DRBD