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I don't see what segment would BTRFS cover. Great comparison though.
BTRFS is being developped as a full-featured filesystem and the only true competitor to ZFS. Somewhat we can read also articles as that: http://www.phoronix.com/scan.php?page=news_item&px=Google-LC...

The reality is that, while BTRFS feature list is impressive, ZFS is second to none here. Moreover, ZFS is _way_ faster.

The real problem is what while BTRFS has good features, its incredible slowness with rewrite/append heavy scenarios make it almost irrilevant in the enterprise space (unless you plan to use it for something as a fileserver, with lots of small files to manage).

Surprisingly, that don't stop some companies (as Netgear) to produce BTRFS-based NAS appliance and to sell them as "virtualization-ready". I can only imagine their slowness in VM handling...