I've been running btrfs on / for about 4 years, I think, and I can remember just one, non-data-eating incident. So no problems for me. But others have very different experiences, so...
> The reason was that apt seems to be really cautious about not ending up in an inconsistent state if aborted in the middle of an operation, so it does plenty of fsync (IIRC) calls. At least back then that was a known performance problem in btrfs.
Yes, this was rather bad, but there was a workaround (tell APT to not be so damn paranoid). And this problem is long gone now.
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