CoreOS Moves From Btrfs To EXT4 + OverlayFS - PhoronixCoreOS Moves From Btrfs To EXT4 + OverlayFS Written by Michael Larabel in Free Software on 18 January 2015 at 11:08 AM EST. 41 Comments CoreOS developers have had enough issues with the Btrfs file-system that they've decided to move from using the Btrfs file-system to instead use EXT4 plus OverlayFS. Since December the CoreOS developers and stakeholders have been debating switching off Btrfs due t
