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Comment by noja | Hacker News Reader

Damn nice. Can it import btrfs volumes?

The ideal case would be to get a new ZFS system and copy over the network. Depending on how big your data is, and how many spare drives you have, you could probably do something hacky like creating a small ZFS pool on linux, empty a btrfs drive, and then move it over to ZFS. At that point you could export that system and switch over to FreeNAS. But the end result wouldn't be optimal, pretty far from it.

edit: just to clarify ZFS under Linux isn't hacky, ubuntu 16.04 makes it pretty nice, rather this particular suggestion is hacky.

Btrfs is in the Linux kernel. FreenNAS is BSD, not Linux based. You can of course rsync the data from one system to the other over a network cable; and you can also use -c,--checksum option to do checksum verification (super slow but if you care enough to use Btrfs and ZFS you care about data integrity presumably).

You might want to check out Rockstor - it's basically the same thing except with Linux and btrfs.

http://rockstor.com/

I was on Rockstor before - but the number of "rock-ons" (approved docker images) was too low, and raid5 btrfs comes with a giant warning, so I swithed to FreeNAS Corral. It's brilliant. More a beta than the name suggests, but a really impressive piece of work.

Hah, that's funny, I tried FreeNAS initially (an earlier version, though) and gave up because it didn't like some of my hardware.

I'll grant you that raid5 is unstable and the "official" selection of rock-ons is pretty limited. FWIW, adding your own rock-ons isn't very hard - basically drop a json file in a folder and refresh the page. They also accept PRs, so I've added a couple to the official list myself: https://github.com/rockstor/rockon-registry

I doubt FreeBSD can read btrfs volumes directly; however if they let you set up a fully virtualized VM (i.e. appears like its own hardware and you could install Windows under it), then you could create the correct sized VM, install your OS, then migrate.