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SuSE has been using btrfs as their "default stable production filesystem" for a few years now, with no problems.

So it isn't a "recent" change at all.

I've been a big proponent of ZFS, but recently btrfs has been making a lot of good progress with features. Most interesting to me is the ability to rebalance and switch redundancy levels. I have 20TB btrfs array in production as a backup target for a couple months now and it's been doing OK. I've even switched it from raid6 to raid10 and back. There's still a lot of rough edges though, which is why I'm only using it as a backup.

That's insane, unless you've also got tape/offsite/other-but-stable-fs-copy backup?

RHEL7 will support btrfs as a technology preview, which means they'll likely support it fully in a point release. That is a HUGE vote of confidence coming from their QA team.

Oracle have supported it as a production filesystem in OEL for some time. SuSE have made it their default. It will be available in RHEL 7.