Actually, I just discovered that on btrfs, you can disable COW on a volume, or even on individual files. To do it on a per-file basis, you have to compile a sma

Actually, I just discovered that on btrfs, you can disable COW on a volume, or even on individual files. To do it on a per-file basis, you have to compile a small program available here: http://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg14877.html http://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg1... This makes btrfs suitable for virtual machine images.