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Why Should You Consider Btrfs?
Copy On Write (COW) allows for atomic transactions without a separate journal
Snapshots are built in the filesystem and cost little performance, especially compared to LVM.
cp –reflink=always copies within and between subvolumes without duplicating data (ZFS doesn't support this).
Metadata is redundant and checksummed and data is checksummed too (ext4 only has experimental metadata checksums http://goo.gl/tmyAS3 ).