published The initial options for the port system ports Hammer2 for netbsd and freebsd . Currently, ports are still supporting work only in reading mode, but in the future it is planned to implement the recording support for NetBSD (for FREEBSD, they do not intend to add recording support).
FS Hammer2 is developing Dragonfly BSD developers and is notable for functions such as a separate mounting of snapshots , accessible snapshots, quotas at the level of directory, incremental mirroring, support of various data compression algorithms, the possibility of combining several disc volumes, restoration of errors during mounting (without FSCK), Multi-Master Mirroring with data distribution into several hosts.
/Media reports cited above.