I lost a btrfs-raid5-like NAS out of the blue (after 3-4 months of using it, I didn't even write a lot on it): the filesystem was always cleanly unmounted, I d

I lost a btrfs-raid5-like NAS out of the blue (after 3-4 months of using it, I didn't even write a lot on it): the filesystem was always cleanly unmounted, I didn't do any crazy experiments with it, it had plenty (>40%, hundreds of GiBs) of free disk space; on one day I noticed that accessing some files was slower than usual, the noise of the HDDs had a weird pattern and from there it went downhill (at that time there was no fsck utility so I didn't even know what to do - if I'm not mistaken, BUT I MIGHT, the general opinion was that a fsck-util was not even needed? but again, I might have just dreamed this) and finally stopped working with a huge amount of error messages in the kernel logs => I had to reformat everything (I went back to mdadm-raid5) and restore from the secondary NAS' backup. In my opinion there were 2 main things that contributed to the bad reputation of the FS: 1) In those days there was a looot of hype about btrfs (as well for me it was a dream come true) which is the reason why I decided to use it. As far as I remember I didn't have to enable any special "experimental" feature in the kernel to use it => that gave me the impression that "it works under normal conditions, the DEVs are probably being a bit conservative for corner cases". 2) All functionalities (e.g. raid5 with rebalancing in my case) were all available from day 1 (at least when I started using it) so if something's available I tend to think that it works (I mean, from a user's point of view why make something available that does not work?) - but no, apparently many people had many problems with many different configurations/usage patterns. - As others have written I hope that Bcachefs will primarily focus on reliability and only secondarily on performance & features, but I admit that that's difficult to balance :). And I hope that the fsck-utility will be available from day1 (at least with a reduced functionality). And I hope that "experimental" features will need some kind of very explicit command line option (e.g. "-might_break_everything") to use them through userland utils. Go Kent!!! :) I'm since a while one of your Patreon follower - If you manage to create something usable I'll print the pic shown on LWM and I'll hang it up in my PC-room, maybe I'll even take my twitter account out of cryosleep to tell Musk that he should use Bcachefs as FS for his Teslas :))